CN101471532B - Frequency-doubling method capable of preventing frequency-doubling recede transition and laser - Google Patents
Frequency-doubling method capable of preventing frequency-doubling recede transition and laser Download PDFInfo
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- CN101471532B CN101471532B CN2007103046350A CN200710304635A CN101471532B CN 101471532 B CN101471532 B CN 101471532B CN 2007103046350 A CN2007103046350 A CN 2007103046350A CN 200710304635 A CN200710304635 A CN 200710304635A CN 101471532 B CN101471532 B CN 101471532B
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Abstract
The invention relates to a frequency doubling method capable of obviating reverse conversion and a laser. The method comprises the following steps: (1) doubling the frequency of a fundamental beam generated by a laser source through a frequency doubling material, and splitting the frequency-doubled beam into two beams by a dichroic mirror; (2) changing the polarization direction of one frequency-doubled beam generated by a first single pass through a 1/4 wave plate of a frequency-doubled beam and a reflector, and returning to the frequency doubling material; (3) reflecting the residual fundamental beam in the first single pass to the frequency doubling material to carry out second frequency doubling; and (4) splitting a double-pass frequency-doubled beam from the frequency doubling material and the residual fundamental beam in the second single pass into two beams by a dichroic mirror, outputting the double-pass frequency-doubled beam, and returning the residual fundamental beam in the second single pass. By rotating the polarization direction of the frequency-doubled beam of the first single pass by 90 DEG, the method can prevent reverse conversion of the frequency-doubled beam to the fundamental beam, thereby improving the laser frequency doubling conversion efficiency. The method can be widely used in various kinds of intracavity and extracavity solid-state lasers.
Description
Technical field
The present invention relates to a kind of laser, particularly move back the frequency-doubling method and the laser of conversion about a kind of frequency multiplication that can prevent.
Background technology
When design utilized the nonlinear effect of nonlinear material to obtain the solid-state laser of double-frequency laser output, general hope obtained high-power laser output.All solid state frequency double laser is divided into two big classes: external cavity type and intracavity, and the former is owing to fundamental power density outside the chamber is low, and general conversion efficiency is lower; The latter has directly utilized fundamental power density higher in the chamber, therefore can carry out nonlinear transformation effectively.Fundamental frequency light in the intracavity generally adopts the mode of round trip by nonlinear material, produces frequency doubled light back and forth.The original intention of this method is to prolong laser and the interactional length of nonlinear material, and in the hope of converting fundamental frequency light as much as possible to frequency doubled light, and the frequency doubled light that this round trip produces is exported together.But, in the method for this round trip output, " moving back conversion " after frequency doubled light increases to certain intensity, can take place, the conversion of frequency doubled light to fundamental frequency light promptly takes place, make shg output power and shg efficiency reduce.
David Eimerl is at " Quadrature Frequency Conversion (orthogonal frequency conversion) " (IEEEJournal of Qantum Electronics, Vol.QE-23, No.8,1987) in the literary composition, adopt two nonlinear materials of cascade to carry out II class phase matched frequency multiplication, the two cutting mode makes that fast light and the slower rays direction in first material is respectively second slower rays in the material and fast light direction.Fundamental frequency light remaining in first material still satisfies phase-matching condition in second material, continue to produce frequency doubled light, but vertical with the frequency doubled light polarization direction that produces in first material.Thereby, when the frequency doubled light that produces in first nonlinear material is transferred in second material, owing to do not satisfy phase-matching condition, the conversion of moving back to fundamental frequency light can not take place.This method need be used two independently double-frequency materials, and only is applicable to II class phase matched frequency multiplication process.
The Raymond G.Beausoleil of Cygnus Laser Corporation, Redmond, Wash is at United States Patent (USP) 5,247, among 389 " the Nonliner Optical Frequency Converter (nonlinear optical frequency conversion device) ", still adopt the double-frequency material of cascade.Owing to adopted a wave plate at two storerooms, make the frequency doubled light polarization direction that in first material, produces rotate 90 degree, therefore this frequency doubled light does not satisfy phase matched in second material, does not therefore take place " moving back conversion ".
In the above-mentioned document, all need to adopt two blocks of nonlinear materials,, realize that this method needs to have the wave plate of dispersivity though, mention in 389 and adopt monolithic nonlinear material and wave plate just can realize the method for preventing that retaining is changed at United States Patent (USP) 5,247.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of frequency multiplication that can prevent and move back the frequency-doubling method and the laser of conversion.
For achieving the above object, the present invention takes following technical scheme:
A kind of frequency multiplication that can prevent is moved back the frequency-doubling method of conversion, and it may further comprise the steps: after the fundamental frequency light that (1) sends lasing light emitter passes through a double-frequency material frequency multiplication, be divided into two-way by a dichroscope; (2) frequency doubled light that first one way is produced by a frequency doubled light quarter wave plate and after a speculum changes the polarization direction, return and by described double-frequency material; (3) the remaining fundamental frequency light of first one way is returned described double-frequency material through a mirror reflects, carry out the frequency multiplication second time; (4) the round trip frequency doubled light and second the remaining fundamental frequency light of one way that will come out from described double-frequency material is divided into two-way by a dichroscope, described round trip frequency doubled light output, and the remaining fundamental frequency light of described second one way returns.
A kind of frequency multiplication that can prevent is moved back the frequency double laser of conversion, and it comprises the lasing light emitter that produces fundamental frequency light, the chamber mirror, and double-frequency material is arranged on the dichroscope at double-frequency material two ends; It is characterized in that: the dichroscope at described relatively double-frequency material rear, the quarter wave plate and a speculum of a frequency doubled light are set, make the frequency doubled light that produces in first one way back and forth by behind the quarter wave plate of described frequency doubled light, the polarization direction is rotated 90 °.
The fundamental frequency light that described lasing light emitter sends is to be arranged on the fundamental frequency light that the laser material of intracavity laser sends.
The fundamental frequency light that described lasing light emitter sends is that external cavity laser sends and through the fundamental frequency light of optical isolator incident.
Described double-frequency material cuts according to I class phase matching angle.
Described double-frequency material cuts according to II class phase matching angle.
Described fundamental frequency light is continuously the laser of output.
Described fundamental frequency light is the laser of pulse output.
The present invention is owing to take above technical scheme, it has the following advantage that has: 1, the present invention adopts frequency doubled light is passed through wave plate, makes the mode of change of polarized direction 90 degree, makes the frequency doubled light that produces for the first time in return course, no longer meet phase-matching condition, therefore can not convert fundamental frequency light again to; And in first one way remaining fundamental frequency light when returning owing to still satisfy phase-matching condition, therefore can continue to convert to frequency doubled light, thus the frequency doubled light that round trip is produced can both effectively export, improved frequency-doubling conversion efficiency.2, the present invention makes can obtain more powerful frequency doubled light under same fundamental frequency optical power density owing to the raising of frequency-doubling conversion efficiency; The present invention simultaneously need not to adopt the wave plate with dispersivity to reach to prevent frequency multiplication from moving back the purpose of conversion.The present invention can be widely used in the various kinds of intracavity and extracavity solid-state lasers.。
Description of drawings
Fig. 1 is used for the intracavity frequency multiplication embodiment of I class phase matched and II class phase matched for the present invention.
Fig. 2 is used for the external cavity type frequency doubling embodiment of I class phase matched and II class phase matched for the present invention
Embodiment
Embodiment 1:
As shown in Figure 1, present embodiment is to adopt I class phase matched intracavity frequency multiplication.LM is the Nd:YAG laser material, NLC is the LBO double-frequency material according to the cutting of I class phase matching angle, WP is the quarter wave plate of 532nm frequency doubled light, chamber mirror M1 and M2 are to the high reflection of fundamental frequency light of 1064nm, dichroscope M3 is to the high reflection of 1064nm fundamental frequency light, and to the high transmission of 532nm frequency doubled light, dichroscope M4 is to the high transmission of 1064nm, to the high reflection of 532nm, the high reflection of 5 couples of 532nm of mirror M.
The laser that Nd:YAG produces is " P " polarization state, produces the 532nm laser of " S " polarization state after the LBO frequency multiplication, and after this frequency doubled light was reflected by dichroscope M4, back and forth by quarter wave plate WP, 90 degree were rotated in the polarization direction, become " P " polarization state.In return course, continue to be converted to the 532nm frequency doubled light of " S " polarization state by the LBO double-frequency material through the fundamental frequency light of the 1064nm of chamber mirror M2 reflection, and the 532nm frequency doubled light that produces in first one way is owing to become " P " polarization state, no longer satisfy phase-matching condition, therefore can not move back and convert fundamental frequency light to, the frequency doubled light that round trip produces is at last together by dichroscope M3 output.After remaining fundamental frequency light is reflected by M3, continue vibration and amplification in the chamber.
Embodiment 2:
Present embodiment is to adopt II class phase matched intracavity frequency multiplication.LM is the Nd:YVO4 laser material, NLC is the KTP double-frequency material according to the cutting of II class phase matching angle, WP is the quarter wave plate of 532nm frequency doubled light, chamber mirror M1 and M2 are to the high reflection of fundamental frequency light of 1064nm, dichroscope M3 is to the high reflection of 1064nm fundamental frequency light, and to the high transmission of 532nm frequency doubled light, dichroscope M4 is to the high transmission of 1064nm, to the high reflection of 532nm, the high reflection of 5 couples of 532nm of mirror M.
The laser polarization direction that Nd:YVO4 produces becomes miter angle with paper, produces the 532nm laser of " S " polarization state after the KTP frequency multiplication, and after this frequency doubled light was reflected by dichroscope M4, back and forth by quarter wave plate WP, 90 degree were rotated in the polarization direction, become " P " polarization state.In return course, the fundamental frequency light of 1064nm continues to be converted into the 532nm frequency doubled light of " S " polarization state, and the 532nm frequency doubled light that produces in first one way is owing to become " P " polarization state, no longer satisfy phase-matching condition, therefore can not move back and convert fundamental frequency light to, the frequency doubled light that round trip produces is at last together by dichroscope M3 output.After remaining fundamental frequency light is reflected by M3, continue vibration and amplification in the chamber.
Embodiment 3: as shown in Figure 2, present embodiment is to adopt I class phase matched external cavity type frequency doubling.FL is a fundamental frequency light, P is an optical isolator, NLC is the LBO double-frequency material according to the cutting of I class phase matching angle, WP is the quarter wave plate of 532nm frequency doubled light, dichroscope M1 and M2 are to the high transmission of fundamental frequency light of 1064nm, to the high reflection of 532nm frequency doubled light, the high reflection of 3 pairs of 1064nm fundamental frequencies of mirror M light, the high reflection of 4 pairs of 532nm frequency doubled lights of mirror M.
FL fundamental frequency light by optical isolator P is " P " polarization state, produces the 532nm laser of " S " polarization state after the LBO frequency multiplication, and after this frequency doubled light was reflected by dichroscope M2, back and forth by quarter wave plate WP, 90 degree were rotated in the polarization direction, become " P " polarization state.Through the 1064nm fundamental frequency light of dichroscope M2 transmission and the mirror M3 that is reflected reflection in return course, continue to be converted into the 532nm frequency doubled light of " S " polarization state by the LBO frequency multiplication, and the 532nm frequency doubled light that produces in first one way is owing to become " P " polarization state, when returning by LBO, no longer satisfy phase-matching condition, therefore can not move back and convert fundamental frequency light to.Together by dichroscope M1 reflection output, optical isolator P avoids remaining fundamental frequency light to return and damage other optics to the frequency doubled light that round trip produces at last.
The foregoing description 3 also can adopt II class phase matched external cavity type frequency doubling mode, and situation and the foregoing description 3 are roughly the same, so repeat no more.
Claims (10)
1. one kind can prevent that frequency multiplication from moving back the frequency-doubling method of conversion, and it may further comprise the steps:
(1) the fundamental frequency light that lasing light emitter is sent is by a double-frequency material, carry out first one way frequency multiplication after, frequency doubled light and the remaining fundamental frequency light of first one way that first one way is produced are divided into two-way by first dichroscope;
(2) frequency doubled light that produces of first one way by described first dichroic mirror reflects after, be mapped to behind the speculum by described mirror reflects once more by this quarter wave plate by a quarter wave plate, the polarization direction is rotated 90 °, returns and by described double-frequency material;
(3) with the remaining fundamental frequency light of first one way after the described first dichroscope transmission, once more after the described first dichroscope transmission, returned described double-frequency material by a chamber mirroring, carry out second one way frequency multiplication;
(4) the round trip frequency doubled light and second remaining fundamental frequency light of one way that will come out from described double-frequency material, be divided into two-way by second dichroscope, the output of described round trip frequency doubled light, the remaining fundamental frequency light of described second one way continue in the chamber to stop outside vibration and amplification or the output cavity and by optical isolator.
2. a kind of frequency multiplication that can prevent as claimed in claim 1 is moved back the frequency-doubling method of conversion, it is characterized in that: the fundamental frequency light that described lasing light emitter sends is to be arranged on the fundamental frequency light that the laser material of intracavity laser sends.
3. a kind of frequency multiplication that can prevent as claimed in claim 1 is moved back the frequency-doubling method of conversion, it is characterized in that: the fundamental frequency light that described lasing light emitter sends is that external cavity laser sends and through the fundamental frequency light of optical isolator incident.
4. move back the frequency-doubling method of conversion as claim 1 or 2 or 3 described a kind of frequencys multiplication that can prevent, it is characterized in that: described nonlinear material cuts according to I class phase matching angle.
5. move back the frequency-doubling method of conversion as claim 1 or 2 or 3 described a kind of frequencys multiplication that can prevent, it is characterized in that: described nonlinear material cuts according to II class phase matching angle.
6. move back the frequency-doubling method of conversion as claim 1 or 2 or 3 described a kind of frequencys multiplication that can prevent, it is characterized in that: the laser of described fundamental frequency light for exporting continuously.
7. move back the frequency-doubling method of conversion as claim 1 or 2 or 3 described a kind of frequencys multiplication that can prevent, it is characterized in that: described fundamental frequency light is the laser of pulse output.
8. one kind can prevent that frequency multiplication from moving back the frequency double laser of conversion, and it comprises the lasing light emitter of incident fundamental frequency light, the chamber mirror, and double-frequency material is arranged on the dichroscope at double-frequency material two ends; It is characterized in that: the described dichroscope between described relatively double-frequency material and the described chamber mirror, the quarter wave plate and a speculum of one frequency doubled light are set, after making the frequency doubled light that produces in first one way by this dichroic mirror reflects, pass through the quarter wave plate of described frequency doubled light back and forth, the polarization direction is rotated 90 °, and the fundamental frequency light that described lasing light emitter sends is the fundamental frequency light that external cavity laser sends and sends through the fundamental frequency light of optical isolator incident or for the laser material that is arranged on intracavity laser.
9. a kind of frequency multiplication that can prevent as claimed in claim 8 is moved back the frequency double laser of conversion, it is characterized in that, described double-frequency material adopts the double-frequency material according to the cutting of I class phase matching angle.
10. a kind of frequency multiplication that can prevent as claimed in claim 8 is moved back the frequency double laser of conversion, it is characterized in that, described double-frequency material is the double-frequency material according to the cutting of II class phase matching angle.
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| CN2007103046350A CN101471532B (en) | 2007-12-28 | 2007-12-28 | Frequency-doubling method capable of preventing frequency-doubling recede transition and laser |
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| CN2007103046350A CN101471532B (en) | 2007-12-28 | 2007-12-28 | Frequency-doubling method capable of preventing frequency-doubling recede transition and laser |
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| CN101471532B true CN101471532B (en) | 2010-12-22 |
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| CN105356215A (en) * | 2015-10-30 | 2016-02-24 | 中国工程物理研究院应用电子学研究所 | Direct frequency multiplication device of semiconductor laser |
| CN112688144A (en) * | 2020-12-28 | 2021-04-20 | 上海飞博激光科技有限公司 | Laser based on cavity-outside bi-pass frequency doubling structure |
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Granted publication date: 20101222 Termination date: 20211228 |