CN108336632B - Cavity mirror crystal integrated ultrastable cavity device and method - Google Patents
Cavity mirror crystal integrated ultrastable cavity device and method Download PDFInfo
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Abstract
The invention relates to the field of nonlinear optics, in particular to an integrated ultrastable cavity device and method of an endoscope crystal. The device utilizes the characteristic that the optical crystal is influenced singly and stably by the outside world, integrates the resonant cavity mirror on the optical crystal to form an external cavity crystal assembly with the frequency doubling function, and then utilizes the temperature controller to control the length of the optical crystal so as to meet the resonance condition to realize the external cavity frequency doubling.
Description
Technical Field
The invention belongs to the field of nonlinear optical frequency conversion, injection locking and injection amplification, and particularly relates to an integrated ultrastable cavity device and method for an endoscope crystal.
Background
The nonlinear frequency conversion is a new discipline generated with the development of laser technology, which can obtain laser output in more wave band ranges based on the existing materials, and thus has attracted much attention since the emergence.
Laser frequency doubling is the most widely used and most widely used technique for nonlinear frequency conversion; however, because the dependence of the frequency doubling process on the light intensity of the fundamental frequency light is very high, in the frequency doubling of the fundamental frequency light with low average power, long pulse or continuous output, the commonly used single-pass frequency doubling efficiency is very low, and the frequency doubling efficiency of the external cavity resonance frequency doubling technology can be improved by two orders of magnitude, so that the method has important application value. Particularly, after the external cavity resonance frequency doubling theory based on the PDH (Pound-Drever-Hall) technology appears, at present, the frequency doubling efficiency reaches 95 +/-1% in the aspects of lower power and continuous wave frequency doubling. However, the external cavity frequency doubling technology of injection locking is complex, the price is high, and the external cavity frequency doubling technology requires the operation technology of a user and other difficulties, so that the potential of the external cavity frequency doubling technology entering the market is greatly limited.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problems of complexity and difficult operation of the existing frequency doubling technology.
(II) technical scheme
Aiming at the problems in the prior art, the invention provides an integrated ultrastable cavity device of an endoscopic crystal, which comprises: the laser comprises a first laser, an optical isolator, a transformation lens group, an external cavity crystal component and a temperature controller, wherein an output port of the first laser faces the optical isolator, the transformation lens group and the external cavity crystal component are sequentially arranged along the transmission direction of output light of the first laser, a laser input window and a laser output window are arranged on the temperature controller, the external cavity crystal component is arranged in the temperature controller, the external cavity crystal component comprises an optical crystal and a resonant cavity mirror arranged on the optical crystal, the resonant cavity mirror enables the inside of the optical crystal to form a resonant cavity, and the temperature controller controls the length of the external cavity crystal component by changing the temperature.
The optical crystal is of a rod-shaped, block-shaped or plate-shaped structure, the laser input end face and the laser output end face are arranged in parallel or are symmetrically arranged concave faces, and the output light of the first laser is perpendicular to the laser input end face and enters the optical crystal; the resonant cavity mirror comprises a first cavity mirror arranged on the laser input end surface of the optical crystal and a second cavity mirror arranged on the laser output end surface of the optical crystal, wherein the first cavity mirror partially reflects the output light of the first laser and totally reflects the output light converted by the optical crystal; the second cavity mirror totally reflects the output light of the first laser and highly transmits the output light after being converted by the optical crystal.
The optical crystal is in a polyhedral structure, a certain included angle is formed between the laser input end face and the laser output end face of the optical crystal, the resonant cavity mirror comprises a third cavity mirror arranged on the laser input end face of the external cavity crystal, a fourth cavity mirror arranged on the laser output end face of the external cavity crystal and a fifth cavity mirror arranged on the side face of the external cavity crystal, and the number of the fifth cavity mirrors is one or more; the third cavity mirror reflects part of the output light of the first laser, totally reflects the output light after being converted by the optical crystal, the fourth cavity mirror totally reflects the output light of the first laser, highly transmits the output light after being converted by the optical crystal, and the fifth cavity mirror totally reflects both the output light of the first laser and the output light after being converted by the optical crystal; and the output light of the first laser is injected into the optical crystal through the third cavity mirror and then reflected by the fourth cavity mirror and the fifth cavity mirror to form a closed light path.
The temperature controller comprises a crystal furnace and a temperature control circuit system, wherein the crystal furnace is wrapped outside the external cavity crystal, and the temperature control circuit system is used for accurately controlling the temperature of the crystal furnace so as to accurately control the length of the optical crystal, so that the resonance longitudinal mode of the optical crystal is matched with the output longitudinal mode of the first laser.
The optical crystal is formed by bonding crystals made of the same material at high temperature or by combining a plurality of transparent materials; the resonant cavity mirror is manufactured in a coating mode, or is manufactured by bonding a transparent crystal made of a material different from that of the optical crystal and coating; the surface of the resonant cavity mirror is a plane, a spherical surface or a paraboloid; the optical crystal is made of one of a nonlinear frequency doubling crystal, a gain medium or a nonlinear optical parametric oscillation crystal.
The device also comprises a second laser, and laser emitted by the second laser is incident into the external cavity crystal component and is used for activating the optical crystal.
The invention also provides a method for frequency doubling by using the integrated ultrastable cavity device of the cavity mirror crystal, which comprises the following steps:
(1) after sequentially passing through an optical isolator and a transformation lens group, fundamental frequency light emitted by a first laser is injected into an external cavity crystal component made of a nonlinear frequency doubling crystal;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed light beam to be matched with the eigen mode of a resonant cavity formed by combining all the resonant cavity mirrors of the external cavity crystal component;
(4) and (3) repeating the steps (2) and (3) until the resonance of the fundamental frequency light is enhanced in the external cavity crystal component, and converting the fundamental frequency light into frequency doubling light under the action of the nonlinear frequency doubling crystal and outputting the frequency doubling light from the laser output window.
The invention also provides a method for injection locking by using the integrated ultrastable cavity device of the cavity mirror crystal, which comprises the following steps:
(1) the output light emitted by the first laser sequentially passes through the optical isolator and the transformation lens group and then is injected into the external cavity crystal component made of the laser gain medium;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed light beam to be matched with the eigenmode of the resonant cavity in the external cavity crystal component;
(4) and (3) repeating the steps (2) and (3) until the light beam resonates in the resonant cavity, so that injection locking is realized.
The invention also provides a method for carrying out optical parametric oscillation by utilizing the integrated ultrastable cavity device of the cavity mirror crystal, which comprises the following steps:
(1) the pump light output by the first laser sequentially passes through the optical isolator and the transformation lens group and then is injected into an external cavity crystal component made of a nonlinear optical parametric oscillation crystal;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed pump light to be matched with the eigen mode of a resonant cavity formed by combining all the resonant cavity mirrors of the external cavity crystal assembly;
(4) repeating the steps (2) and (3) until the resonance enhancement of the pump light in the resonant cavity is obtained;
(5) under the nonlinear effect of the external cavity optical parametric oscillation crystal, the pump light is converted into signal light and is output from the laser output window.
The invention provides a method for injecting and amplifying by using the integrated ultrastable cavity device of the cavity mirror crystal, which comprises the following steps:
(1) the seed light output by the first laser sequentially passes through the optical isolator and the transformation lens group and then is injected into the external cavity crystal component made of the laser gain medium, and meanwhile, the pumping source laser is turned on to activate the laser gain medium;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed seed light to be matched with the eigen mode of a resonant cavity formed by combining all the resonant cavity mirrors of the external cavity crystal component;
(4) and (3) repeating the steps (2) and (3) until the seed light is obtained to resonate in the resonant cavity, so that injection amplification is realized.
(III) advantageous effects
The invention provides an integrated cavity mirror crystal ultrastable device and a method thereof, the device comprises a first laser, an optical isolator, a transformation lens group, an external cavity crystal component and a temperature controller, wherein an output port of the first laser faces to the optical isolator, the transformation lens group and the external cavity crystal component are sequentially arranged along the transmission direction of output light of the first laser, a laser input window and a laser input window are arranged on the temperature controller, the external cavity crystal component is arranged in the temperature controller, the external cavity crystal component comprises an optical crystal and a resonant cavity mirror arranged on the optical crystal, resonance enables the internal of the optical crystal to form a resonant cavity, and the temperature controller controls the length of the external cavity crystal component by changing temperature. The device utilizes the characteristic that the optical crystal is influenced singly and stably by the outside world, integrates the resonant cavity mirror on the optical crystal to form an external cavity crystal component with the frequency doubling function, and then utilizes an accurate temperature controller to accurately control the length of the optical crystal so as to meet the resonance condition to realize external cavity frequency doubling.
In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions and the advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and the advantages brought by the technical features of the technical solutions will be further explained with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an integrated ultrastable cavity device of an endoscopic crystal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a crystal assembly with an outer cavity according to one embodiment of the present invention;
fig. 3 is a schematic structural diagram of an integrated ultrastable cavity device of an endoscopic crystal according to a second embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an outer cavity crystal assembly in accordance with a second embodiment of the present invention;
fig. 5 is a view of an integrated ultrastable cavity device of an endoscopic crystal provided in the third embodiment of the present invention.
In the figure, 11: a first laser; 12: an optical isolation device; 13: a shift lens group; 14: an external cavity crystal assembly; 15: a temperature controller; 16: a laser input window; 17: a laser output window; 18: a fundamental frequency light; 19: frequency doubling light; 24: an external cavity crystal assembly; 34: an external cavity crystal assembly; 141: an external cavity crystal assembly; 241: an optical crystal; 310: a second laser; 311: the output light of the second laser; m1: a first cavity mirror; m2: a second cavity mirror; m3: a third cavity mirror; m4: a fourth cavity mirror; m5: and a fifth cavity mirror.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present invention, unless otherwise specified, "plurality", "plural groups" means two or more, and "several", "several groups" means one or more.
Example one
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides an integrated ultrastable cavity device with an endoscopic crystal, including: first laser 11, optical isolator 12, transform lens group 13, external cavity crystal subassembly 14 and temperature controller 15, the delivery outlet of first laser 11 is towards optical isolator 12, transform lens group 13 and external cavity crystal subassembly 14 set gradually along the direction of transmission of first laser output light, be equipped with laser input window 16 and laser output window 17 on the temperature controller 15, external cavity crystal subassembly 14 is located the inside of temperature controller 15, and external cavity crystal subassembly 14 includes optical crystal 141 and locates the resonator mirror on optical crystal 141, the resonator mirror makes the inside formation resonant cavity of optical crystal, temperature controller 15 is through the length that changes temperature control external cavity crystal subassembly 14. The device utilizes the characteristic that the optical crystal is influenced singly and stably by the outside world, integrates the resonant cavity mirror on the optical crystal to form an external cavity crystal component, and then utilizes an accurate temperature controller to accurately control the length of the optical crystal so as to meet the resonance condition.
Further, the optical crystal 141 is a rod-shaped structure, the laser input end surface and the laser output end surface of the optical crystal are parallel, and the output light of the first laser 11 is incident into the optical crystal 141 perpendicular to the laser input end surface; the resonant cavity mirror comprises a first cavity mirror M1 arranged on the laser input end surface of the optical crystal and a second cavity mirror M2 arranged on the laser output end surface of the optical crystal, wherein the first cavity mirror M1 reflects part of the output light of the first laser 11 and totally reflects the output light converted by the optical crystal 141; the second cavity mirror M2 totally reflects the output light of the first laser 11, and highly transmits the output light after being converted by the optical crystal 141. Eventually, the light beam oscillates in resonance in the outer cavity crystal assembly.
Further, the temperature controller 15 includes a crystal furnace and a temperature control circuit system, the crystal furnace is wrapped outside the external cavity crystal assembly 14, and the temperature control circuit system is used for accurately controlling the temperature of the crystal furnace, so as to accurately control the length of the optical crystal 141, and match the longitudinal mode of the external cavity crystal assembly 14 with the longitudinal mode output by the first laser. The temperature control precision of the temperature controller 15 is less than or equal to 0.01 ℃, and the crystal furnace can be of a full-surrounding structure. In the experiment, firstly, the optimum frequency doubling temperature K of KDP crystal is roughly selected0Second, at K0The Km is accurately adjusted nearby, so that the length of the optical crystal 141 is changed, resonance enhancement of the optical crystal 141 in the resonant cavity is realized, and the Km is locked immediately.
Further, the optical crystal 141 is formed by bonding crystals of the same material at high temperature, or by combining a plurality of transparent materials; the resonant cavity mirror is made by adopting a film coating mode, or is made by bonding a transparent crystal with a material different from that of the optical crystal 141 and then coating a film; the surface of the resonant cavity mirror is a plane, a spherical surface or a paraboloid;
further, the optical crystal 141 is made of one or more of a nonlinear frequency doubling crystal, a gain medium, or a nonlinear optical parametric oscillation crystal. In this embodiment, the optical crystal 141 may be a laser crystal, or may be a frequency conversion crystal insensitive to temperature during frequency conversion, such as KDP and LiNO under angle matching3LBO, BBO or periodically poled crystal, preferably KDP, the crystal has mature growth and processing technology and lower price; the optical quality and the damage threshold are higher, and the requirements can be better met. Under the condition of meeting the phase matching, the reflectivity of the first cavity mirror M1 for the output light of the first laser is determined by calculating the static loss of the crystal so as to meet the impedance matching condition, the first cavity mirror M1 totally reflects the converted output light, the second cavity mirror M2 totally reflects the output light of the first laser, and the converted output light is highly transmitted. Eventually the output light of the first laser is oscillated in the external cavity crystal assembly.
Example two
As shown in fig. 3 and fig. 4, the present embodiment is similar to the first embodiment, and the same parts are not repeated, but the difference between the first embodiment and the second embodiment is that the optical crystal 241 in the present embodiment is a polyhedron structure, and an included angle exists between the laser input end face and the laser output end face, and the resonator cavity mirror includes a third cavity mirror M3 disposed on the laser input end face of the external cavity crystal, a fourth cavity mirror M4 disposed on the laser output end face of the external cavity crystal, and a fifth cavity mirror M5 disposed on the other side edge of the external cavity crystal; the number of the fifth cavity mirrors M5 is one or more, and the number of the laser output end faces of the optical crystal 241 is one or more; the third cavity mirror M3 reflects part of the output light of the first laser, totally reflects the output light after being converted by the optical crystal, the fourth cavity mirror M4 totally reflects the output light of the first laser, highly transmits the output light after being converted by the optical crystal, and the fifth cavity mirror M5 totally reflects both the output light of the first laser and the output light after being converted by the optical crystal; the output light 18 of the first laser is injected into the optical crystal 241 through the third cavity mirror M3, and then forms a closed optical path through the reflection of the fourth cavity mirror M4 and the fifth cavity mirror M5. In this embodiment, the shape of the optical crystal 241 is as shown in fig. 4, the fifth cavity mirror M5 is disposed on the bottom surface of the optical crystal 241, the light beam enters the optical crystal from the third cavity mirror M3, is refracted and then enters the fifth lens M5, is reflected by the fifth cavity mirror M5 and then enters the fourth cavity mirror M4, and is reflected back to the third cavity mirror M3, so as to form a closed optical path.
The cavity mirror crystal integrated ultrastable device of the first embodiment and the cavity mirror crystal integrated ultrastable device of the second embodiment can be used for carrying out frequency doubling, injection locking, optical parametric oscillation and other tests on light beams.
1. The method for frequency doubling of a light beam by using the cavity mirror crystal integrated ultrastable cavity device of the first embodiment or the second embodiment is adopted, when frequency doubling is performed, the first laser 11 emits single-frequency light, the optical crystal 141 or the optical crystal 241 is made of a nonlinear frequency doubling crystal, taking the cavity mirror crystal integrated ultrastable cavity device of the first embodiment as an example for frequency doubling, the operation steps of the method mainly include:
(1) after sequentially passing through the optical isolator 12 and the transformation lens group 13, the fundamental frequency light emitted by the first laser 11 is injected into the external cavity crystal assembly 14 made of nonlinear frequency doubling crystals, and the transformation lens group 13 performs mode transformation on the fundamental frequency light 18, so that the mode of the fundamental frequency light 18 is matched with the intrinsic mode of a resonant cavity in the external cavity crystal assembly 14, namely, the mode matching is met;
(2) adjusting the target temperature Km of the temperature controller 15 to change the length of the external cavity crystal assembly 14;
(3) adjusting the transformation lens group 13 to match the transformed light beam with the eigen mode of the resonant cavity combined by each resonant cavity mirror of the external cavity crystal component 14;
(4) and (3) repeating the steps (2) and (3) until the obtained fundamental frequency light 18 is resonantly enhanced in the outer cavity crystal assembly 14, and under the nonlinear effect of the frequency doubling crystal, the fundamental frequency light 18 is converted into frequency doubling light 19 to be output from the laser output window.
2. In the method for injection locking of a light beam by using the cavity mirror and crystal integrated ultrastable device of the first embodiment or the second embodiment, the first laser 11 emits seed light, and the external cavity crystal assembly 14 or the external cavity crystal assembly 24 is made of a laser gain medium, for example, the injection locking of the cavity mirror and crystal integrated ultrastable device of the first embodiment is performed, and the operation steps mainly include:
(1) the output light emitted by the first laser 11 sequentially passes through the optical isolator 12 and the transformation lens group 13 and then is injected into an external cavity crystal component 14 made of a laser gain medium;
(2) adjusting the target temperature of the temperature controller 15 to change the length of the external cavity crystal assembly 14;
(3) adjusting the transforming lens group 13 to match the transformed light beam with the eigenmode of the resonant cavity in the external cavity crystal component 14;
(4) and (3) repeating the steps (2) and (3) until the light beam resonates in the resonant cavity, so that injection locking is realized.
3. The method for performing optical parametric oscillation on a light beam by using the cavity mirror and crystal integrated ultrastable device of the first embodiment and the second embodiment, wherein the first laser 141 is a pump source laser, and the external cavity crystal component 14 or the external cavity crystal component 24 is made of a nonlinear crystal, takes the optical parametric oscillation performed by the cavity mirror and crystal integrated ultrastable device of the first embodiment as an example, and the operation steps mainly include:
(1) the pump light output by the first laser 11 sequentially passes through the optical isolator 12 and the transformation lens group 13 and then is injected into an external cavity crystal component 14 made of an external cavity optical parametric oscillation crystal;
(2) adjusting the target temperature of the temperature controller 15 to change the length of the external cavity crystal assembly 14;
(3) adjusting the transformation lens group 13 to match the transformed pump light with the eigen mode of the resonant cavity formed by combining the resonant cavity mirrors on the external cavity crystal component 14;
(4) repeating the steps (2) and (3) until the resonance enhancement of the pump light in the resonant cavity is obtained;
(5) under the nonlinear effect of the external cavity optical parametric oscillation crystal, the pump light is converted into signal light and is output from the laser output window 17.
EXAMPLE III
As shown in fig. 5, the structure of the present embodiment is similar to that of the first and second embodiments, and the same parts are not described again, and the present embodiment is different from the first and second embodiments in that: the cavity mirror crystal integrated ultrastable cavity device of the present embodiment further includes a second laser 310, the second laser 310 emits laser light to the external cavity crystal assembly 34 for activating the external cavity crystal assembly 34, in the present embodiment, the structure of the external cavity crystal assembly 34 may be the same as that of the external cavity crystal assembly 14 in the first embodiment, or the same as that of the external cavity crystal assembly 24 in the second embodiment, the first laser 11 is a seed source laser, the second laser 310 is a pump source laser, and the optical crystal is made of a gain medium.
The embodiment also provides a method for injecting and amplifying the light beam by using the cavity mirror crystal integrated ultrastable cavity device of the embodiment, and the specific operation steps mainly comprise:
1) the seed light output by the first laser 11 sequentially passes through the optical isolator 12 and the transformation lens group 13, and then is injected into the optical crystal made of the laser gain medium, and simultaneously the second laser 310 is turned on, and the output light 311 of the second laser activates the external cavity crystal component 34;
(2) adjusting the target temperature of the temperature controller 15 to change the length of the external cavity crystal assembly 34;
(3) adjusting the transformation lens group 13 to match the transformed seed light with the eigenmode of the resonant cavity synthesized by each resonant cavity lens on the external cavity crystal component 34;
(4) and (3) repeating the steps (2) and (3) until the seed light is obtained to resonate in the resonant cavity, so that injection amplification is realized.
When the light source is used, a reflector group can be arranged in the transmission direction of the light beams, the reflector group comprises two reflectors which are arranged in parallel, and the reflectors and the transmission direction of the light beams form an angle of 45 degrees for changing the transmission direction of the light beams according to requirements. In the first and second embodiments, the reflecting mirror groups are disposed between the optical isolation device and the transforming lens group, and in the third embodiment, the number of the reflecting mirror groups is two, and the two reflecting mirror groups are respectively disposed between the optical isolation device and the transforming lens group and on the transmission light path of the pump source laser.
As a supplement, the "cavity mirror crystal integrated external cavity device" provided by the embodiment of the present invention can also be applied to the sum frequency or difference frequency technology.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides an ultrastable chamber device of chamber mirror crystal integration which characterized in that includes: the laser comprises a first laser, an optical isolator, a transformation lens group, an external cavity crystal component and a temperature controller, wherein an output port of the first laser faces the optical isolator, the transformation lens group and the external cavity crystal component are sequentially arranged along the transmission direction of output light of the first laser, a laser input window and a laser output window are arranged on the temperature controller, the external cavity crystal component is arranged in the temperature controller and comprises an optical crystal and a resonant cavity mirror arranged on the optical crystal, the resonant cavity mirror enables the interior of the optical crystal to form a resonant cavity, and the temperature controller controls the length of the external cavity crystal component by changing the temperature;
the temperature controller comprises a crystal furnace and a temperature control circuit system, wherein the crystal furnace is wrapped outside the external cavity crystal, and the temperature control circuit system is used for accurately controlling the temperature of the crystal furnace so as to accurately control the length of the optical crystal and enable the resonant longitudinal mode of the optical crystal to be matched with the output longitudinal mode of the first laser.
2. The cavity mirror crystal integrated ultrastable cavity device according to claim 1, wherein the optical crystal is a rod-like, block-like or plate-like structure, the laser input end surface and the laser output end surface are parallel or symmetrically arranged concave surfaces, and the first laser output light is incident into the optical crystal perpendicular to the laser input end surface; the resonant cavity mirror comprises a first cavity mirror arranged on the laser input end surface of the optical crystal and a second cavity mirror arranged on the laser output end surface of the optical crystal, wherein the first cavity mirror partially reflects the output light of the first laser and totally reflects the output light converted by the optical crystal; the second cavity mirror totally reflects the output light of the first laser and highly transmits the output light after being converted by the optical crystal.
3. The cavity mirror crystal integrated ultrastable device according to claim 1, wherein said optical crystal is a polyhedron structure, and an included angle exists between a laser input end face and a laser output end face, and said resonator mirrors include a third cavity mirror disposed on the laser input end face of said external cavity crystal, a fourth cavity mirror disposed on the laser output end face of said external cavity crystal, and a fifth cavity mirror disposed on a side face of said external cavity crystal, and the number of said fifth cavity mirrors is one or more; the third cavity mirror reflects part of the output light of the first laser, totally reflects the output light after being converted by the optical crystal, the fourth cavity mirror totally reflects the output light of the first laser, highly transmits the output light after being converted by the optical crystal, and the fifth cavity mirror totally reflects both the output light of the first laser and the output light after being converted by the optical crystal; and the output light of the first laser is injected into the optical crystal through the third cavity mirror and then reflected by the fourth cavity mirror and the fifth cavity mirror to form a closed light path.
4. The integrated ultrastable cavity device with endoscopic crystals as defined in claim 2 or 3, wherein said optical crystal is made of crystals of the same material by high temperature bonding or a combination of multiple transparent materials; the resonant cavity mirror is manufactured in a coating mode, or is manufactured by bonding a transparent crystal made of a material different from that of the optical crystal and coating; the surface of the resonant cavity mirror is a plane, a spherical surface or a paraboloid; the optical crystal is made of one of a nonlinear frequency doubling crystal, a gain medium or a nonlinear optical parametric oscillation crystal.
5. The cavity mirror crystal integrated ultrastable device according to claim 4, further comprising a second laser, wherein laser light from said second laser is incident into said external cavity crystal assembly for activating said optical crystal.
6. A method for frequency doubling using the cavity mirror crystal integrated ultrastable cavity device of claim 4, comprising the steps of:
(1) after sequentially passing through an optical isolator and a transformation lens group, fundamental frequency light emitted by a first laser is injected into an external cavity crystal component made of a nonlinear frequency doubling crystal;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed light beam to be matched with the eigen mode of a resonant cavity formed by combining all the resonant cavity mirrors of the external cavity crystal component;
(4) and (3) repeating the steps (2) and (3) until the resonance of the fundamental frequency light is enhanced in the external cavity crystal component, and converting the fundamental frequency light into frequency doubling light under the action of the nonlinear frequency doubling crystal and outputting the frequency doubling light from the laser output window.
7. An injection locking method using the endoscopic crystal integrated ultrastable cavity device of claim 4, comprising the steps of:
(1) the output light emitted by the first laser sequentially passes through the optical isolator and the transformation lens group and then is injected into the external cavity crystal component made of the laser gain medium;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed light beam to be matched with the eigenmode of the resonant cavity of the external cavity crystal component;
(4) and (3) repeating the steps (2) and (3) until the light beam resonates in the resonant cavity, so that injection locking is realized.
8. A method of optical parametric oscillation using the cavity mirror crystal integrated ultrastable device of claim 4, comprising the steps of:
(1) the pump light output by the first laser sequentially passes through the optical isolator and the transformation lens group and then is injected into an external cavity crystal component made of a nonlinear optical parametric oscillation crystal;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed pump light to be matched with the eigen mode of a resonant cavity formed by combining all the resonant cavity mirrors of the external cavity crystal assembly;
(4) repeating the steps (2) and (3) until the resonance enhancement of the pump light in the resonant cavity is obtained;
(5) under the nonlinear effect of the external cavity optical parametric oscillation crystal, the pump light is converted into signal light and is output from the laser output window.
9. An injection amplification method using the endoscopic crystal integrated ultrastable cavity device of claim 5, comprising the steps of:
(1) the seed light output by the first laser sequentially passes through the optical isolator and the transformation lens group and then is injected into the external cavity crystal component made of the laser gain medium, and meanwhile, the second laser is turned on to activate the laser gain medium;
(2) adjusting the target temperature of the temperature controller to change the length of the external cavity crystal component;
(3) adjusting the transformation lens group to enable the transformed seed light to be matched with the eigen mode of a resonant cavity formed by combining all the resonant cavity mirrors of the external cavity crystal component;
(4) and (3) repeating the steps (2) and (3) until the seed light is obtained to resonate in the resonant cavity, so that injection amplification is realized.
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| CN201710040056.3A CN108336632B (en) | 2017-01-18 | 2017-01-18 | Cavity mirror crystal integrated ultrastable cavity device and method |
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| CN201710040056.3A CN108336632B (en) | 2017-01-18 | 2017-01-18 | Cavity mirror crystal integrated ultrastable cavity device and method |
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