CN107394575A - The frequency doubling device of laser - Google Patents
The frequency doubling device of laser Download PDFInfo
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- CN107394575A CN107394575A CN201710735742.2A CN201710735742A CN107394575A CN 107394575 A CN107394575 A CN 107394575A CN 201710735742 A CN201710735742 A CN 201710735742A CN 107394575 A CN107394575 A CN 107394575A
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- 239000013078 crystal Substances 0.000 claims abstract description 71
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims description 9
- 230000010287 polarization Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 4
- WYOHGPUPVHHUGO-UHFFFAOYSA-K potassium;oxygen(2-);titanium(4+);phosphate Chemical compound [O-2].[K+].[Ti+4].[O-]P([O-])([O-])=O WYOHGPUPVHHUGO-UHFFFAOYSA-K 0.000 claims description 3
- RIUWBIIVUYSTCN-UHFFFAOYSA-N trilithium borate Chemical class [Li+].[Li+].[Li+].[O-]B([O-])[O-] RIUWBIIVUYSTCN-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 11
- 230000009466 transformation Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 208000033999 Device damage Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- -1 neodymium ions Chemical class 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910013321 LiB3O5 Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KEWYKJOOCFOYTD-UHFFFAOYSA-N dipotassium;oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[O-2].[K+].[K+].[Ti+4] KEWYKJOOCFOYTD-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 208000007578 phototoxic dermatitis Diseases 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 102220126604 rs199625892 Human genes 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Lasers (AREA)
Abstract
A kind of frequency doubling device of laser is disclosed, belongs to optical technical field.Wherein, incident light is incident to the first spectroscope by the first frequency-doubling crystal, is the first transmitted light and the first reflected light by the first spectroscope beam splitting.First transmitted light successively by shrink beam microscope group, the second frequency-doubling crystal, expand microscope group and the first half-wave plate after be incident to the 3rd spectroscope, it is the second transmitted light and the second reflected light by the 3rd spectroscope beam splitting, the second reflected light is incident to polarised light Amici prism and reflects to form the 3rd reflected light by polarised light Amici prism.First reflected light is incident to the second spectroscope, and the 4th reflected light is obtained after the second dichroic mirror, and the 4th reflected light is incident to polarised light Amici prism after the second half-wave plate and transmits to form the 3rd transmitted light by polarised light Amici prism.3rd reflected light is collectively forming light beam with the 3rd transmitted light.It can improve the conversion ratio during laser-doubled.
Description
Technical field
The present invention relates to optical technical field, more particularly to a kind of frequency doubling device of laser.
Background technology
Frequency conversion is a kind of effective technology for the application for expanding superpower laser, and it is using optical medium strong
Nonlinear optical effect under radiation field produces new frequency.Frequency multiplication is most widely used technology in nonlinear optics, typically
For it is desirable that obtain the higher transformation efficiency from fundamental frequency light to frequency doubled light.
The transformation efficiency for generally improving frequency multiplication process mainly has two kinds of approach：（1）Increase the peak power density of fundamental frequency light.
In the case of given pulsed laser energy and pulse width, the method for peak power density is improved to reduce the size of hot spot,
The shortcomings that this method is that the peak power density of the laser when hot spot reduces to a certain extent has exceeded the plating of laser crystal end face
The damage threshold of film, causes device failure；（2）Increase frequency-doubling crystal length.With conversion base of the fundamental frequency light in frequency-doubling crystal
The peak power density of frequency light gradually reduces, and transformation efficiency declines.So when frequency-doubling crystal length increases to certain length again
Increase crystal length shg efficiency, which does not have, to be obviously improved.
The content of the invention
In view of this, the invention provides a kind of frequency doubling device of laser, it can be improved during laser-doubled
Conversion ratio, thus more suitable for practicality.
In order to reach above-mentioned first purpose, the technical scheme of the frequency doubling device of laser provided by the invention is as follows：
The frequency doubling device of laser provided by the invention includes the first frequency-doubling crystal（1）, the first spectroscope（2a）, the second spectroscope
（2b）, the 3rd spectroscope（2c）, shrink beam microscope group（3）, the second frequency-doubling crystal（4）, expand microscope group（5）, the first half-wave plate（6a）,
Two half-wave plates（6b）And polarization splitting prism（7）,
Incident light（X1）By first frequency-doubling crystal（1）It is incident to first spectroscope（2a）, it is divided by described first
Mirror（2a）Beam splitting is the first transmitted light（X2）With the first reflected light（X3）,
First transmitted light（X2）Pass through the shrink beam microscope group successively（3）, the second frequency-doubling crystal（4）, expand microscope group（5）With
Half of wave plate（6a）After be incident to the 3rd spectroscope（2c）, by the 3rd spectroscope（2c）Beam splitting is the second transmitted light
（X6）With the second reflected light（X4）, second reflected light（X4）It is incident to the polarised light Amici prism（7）And by described inclined
Shake light Amici prism（7）Reflect to form the 3rd reflected light；
First reflected light（X3）It is incident to second spectroscope（2b）, by second spectroscope（2b）Obtained after reflection
4th reflected light（X5）, the 4th reflected light（X5）By second half-wave plate（6b）After be incident to polarised light light splitting
Prism（7）And by the polarised light Amici prism（7）Transmission forms the 3rd transmitted light；
3rd reflected light is collectively forming light beam with the 3rd transmitted light（X7）.
The frequency doubling device of laser provided by the invention can be also applied to the following technical measures to achieve further.
Preferably, the shrink beam microscope group（3）Including the first convex lens（3a）With the first concavees lens（3b）,
First transmitted light（X2）First pass through first convex lens（2a）Pass through first concavees lens again afterwards（3b）；
First convex lens（3a）Primary optical axis, first concavees lens（3b）Primary optical axis be respectively at it is described first transmission
Light（X2）Photocentre extended line on.
Preferably, described expand microscope group（5）Including the second concavees lens（5a）With the second convex lens（5b）,
First transmitted light（X2）First pass through second concavees lens（5a）Pass through second convex lens again afterwards（5b）；
Second concavees lens（5a）Primary optical axis, second convex lens（5b）Primary optical axis be respectively at it is described first transmission
Light（X2）Photocentre extended line on.
Preferably, first frequency-doubling crystal（1）And/or second frequency-doubling crystal（4）On by potassium titanium oxide phosphate or
The crystal for the mixture that the crystal or two kinds of materials that a kind of material in the lithium borate of person three is formed are formed is made.
Preferably, first frequency-doubling crystal（1）With second frequency-doubling crystal（4）It is coated with fundamental frequency light and frequency doubled light
Increasing throw film.
Preferably, first frequency-doubling crystal（1）With second frequency-doubling crystal（4）Material it is identical.
Preferably, second frequency-doubling crystal（4）Sectional area be more than or equal to first frequency-doubling crystal（1）'s
The half of sectional area.
Preferably, set the shrink beam microscope group（3）Minification be m, it is described to expand microscope group（5）Expansion multiple be n,
Then m=n.
Preferably, form the shrink beam microscope group（3）Optical element, form described in expand microscope group（5）Optical element
On be coated with the anti-reflection film of fundamental frequency light and frequency doubled light.
Preferably, first half-wave plate（6a）, the second half-wave plate（6b）Wavelength be frequency multiplication optical wavelength.
Preferably, first half-wave plate（6a）, the second half-wave plate（6b）On be coated with the increasing of fundamental frequency light and frequency doubled light
Permeable membrane.
Preferably, frequency doubled light anti-reflection film is coated with the polarization splitting prism.
Preferably, first spectroscope（2a）, the second spectroscope（2b）, the 3rd spectroscope（2c）Reflecting surface plate
There is reflectivity>99.5% frequency doubled light high-reflecting film, first spectroscope（2a）, the second spectroscope（2b）, the 3rd spectroscope（2c）
Two sides be coated with transmitance>99.5% fundamental frequency light anti-reflection film.
The frequency doubling device of laser provided by the invention in application process, fundamental frequency light by first time frequency multiplication it is transformed after
The remaining energy of journey carries out frequency multiplication conversion again after shrink beam, the frequency doubled light that secondary conversion obtains after expanding with for the first time
Exported after the frequency multiplication combiner that conversion process obtains to improve shg efficiency.In addition, using traditional cavity external frequency multiplication scheme by light
50% can only be reached by learning the general shg efficiency of influence of device damage threshold value；And the frequency multiplication of laser provided by the invention is used to fill
Putting can be in the case where damaging optics, for example, when the minification of shrink beam microscope group is 1.4 times, expands microscope group
Expansion multiple also be 1.4 times when, wherein, when first time frequency multiplication transformation efficiency reaches 50%, fundamental frequency light during second of frequency multiplication
Peak power density reach and first time frequency multiplication process identical is horizontal.It can make to remain in such second of frequency multiplication conversion process
The transformation efficiency of remaining fundamental frequency light reaches 50%, therefore, it is possible to cause now shg efficiency is reached 75%.Wherein, in shrink beam ratio
Example and expand ratio be can be realized under 1.4 times of this parameters 75% shg efficiency, shg efficiency exists during more than 1.4 frequency multiplication
Between 50~75%, the peak power density at second of frequency multiplication can be caused to exceed damage threshold less than 1.4 frequencys multiplication.That is,
In the case where selecting the minification of appropriate shrink beam microscope group, expand the expansion multiple of microscope group, laser provided by the invention
Frequency doubling device can significantly increase electric light transformation efficiency, simultaneously, additionally it is possible to reduce system complexity.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is the optical element and light path schematic diagram of the frequency doubling device of laser provided in an embodiment of the present invention.
Embodiment
The present invention is to solve the problems, such as that prior art is present, there is provided a kind of frequency doubling device of laser, it can improve sharp
Conversion ratio during light device frequency multiplication, thus more suitable for practicality.
Further to illustrate the present invention to reach the technological means and effect that predetermined goal of the invention is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to the frequency doubling device according to laser proposed by the present invention, its embodiment, structure, feature
And its effect, describe in detail as after.In the following description, what different " embodiment " or " embodiment " referred to is not necessarily same
Embodiment.In addition, the feature, structure or feature in one or more embodiments can be combined by any suitable form.
The terms "and/or", only a kind of incidence relation for describing affiliated partner, expression may have three kinds of passes
System, for example, A and/or B, is specifically interpreted as：A and B can be included simultaneously, can be with individualism A, can also individualism
B, can possess above-mentioned three kinds of any situations.
Referring to accompanying drawing 1, the frequency doubling device of laser provided in an embodiment of the present invention includes 1, first point of the first frequency-doubling crystal
Light microscopic 2a, the second spectroscope 2b, the 3rd spectroscope 2c, shrink beam microscope group 3, the second frequency-doubling crystal 4, expand microscope group 5, the first half-wave plate
6a, the second half-wave plate 6b and polarization splitting prism 7.Incident light X1 is incident to the first spectroscope 2a, quilt by the first frequency-doubling crystal 1
First spectroscope 2a beam splitting is the first transmitted light X2 and the first reflected light X3.First transmitted light X2 is successively by shrink beam microscope group 3, the
Two frequency-doubling crystals 4, the 3rd spectroscope 2c is incident to after expanding the half-wave plate 6a of microscope group 5 and first, is by the 3rd spectroscope 2c beam splitting
Second transmitted light X6 and the second reflected light X4, the second reflected light X4 are incident to polarised light Amici prism 7 and are divided rib by polarised light
Mirror 7 reflects to form the 3rd reflected light.First reflected light X3 is incident to the second spectroscope 2b, is obtained after being reflected by the second spectroscope 2b
4th reflected light X5, the 4th reflected light X5 are incident to polarised light Amici prism 7 after the second half-wave plate 6b and by polarised lights point
The transmission of light prism 7 forms the 3rd transmitted light.3rd reflected light is collectively forming light beam X7 with the 3rd transmitted light.
The frequency doubling device of laser provided by the invention in application process, fundamental frequency light by first time frequency multiplication it is transformed after
The remaining energy of journey carries out frequency multiplication conversion again after shrink beam, the frequency doubled light that secondary conversion obtains after expanding with for the first time
Exported after the frequency multiplication combiner that conversion process obtains to improve shg efficiency.In addition, using traditional cavity external frequency multiplication scheme by light
50% can only be reached by learning the general shg efficiency of influence of device damage threshold value；And the frequency multiplication of laser provided by the invention is used to fill
Putting can be in the case where damaging optics, when the minification of shrink beam microscope group is 1.4 times, expands the expansion multiple of microscope group
When being also 1.4 times, wherein, when first time frequency multiplication transformation efficiency reaches 50%, the peak power of fundamental frequency light during second of frequency multiplication
Density reaches horizontal with first time frequency multiplication process identical.It can make remaining fundamental frequency light in such second of frequency multiplication conversion process
Transformation efficiency reaches 50%, therefore, it is possible to cause now shg efficiency is reached 75%.That is, selecting appropriate contracting
The minification of beam microscope group, in the case of expanding the expansion multiple of microscope group, the frequency doubling device of laser provided by the invention can
Electric light transformation efficiency is significantly increased, simultaneously, additionally it is possible to reduce system complexity.
Wherein, shrink beam microscope group 3 includes the first convex lens 3a and the first concavees lens 3b.It is convex that first transmitted light X2 first passes through first
Pass through the first concavees lens 3b after lens 2a again.First convex lens 3a primary optical axis, the first concavees lens 3b primary optical axis are respectively at
On first transmitted light X2 photocentre extended line.Because convex lens and concavees lens have refraction action to light, it is incident according to light
, can be according to characteristic of the refraction index changing light along straightline propagation, in this case, only to the position of convex lens or concavees lens
Have when the first convex lens 3a primary optical axis, the first concavees lens 3b primary optical axis are respectively at the first transmitted light X2 photocentre extended line
When upper, it can ensure that the first transmitted light X2, still being capable of edge after the first convex lens 3a, the first concavees lens 3b is passed through successively
Straightline propagation.
Wherein, expanding microscope group 5 includes the second concavees lens 5a and the second convex lens 5b.It is recessed that first transmitted light X2 first passes through second
Pass through the second convex lens 5b after lens 5a again；Second concavees lens 5a primary optical axis, the second convex lens 5b primary optical axis are respectively at
On first transmitted light X2 photocentre extended line.Because convex lens and concavees lens have refraction action to light, it is incident according to light
, can be according to characteristic of the refraction index changing light along straightline propagation, in this case, only to the position of convex lens or concavees lens
Have when the second concavees lens 5a primary optical axis, the second convex lens 5b primary optical axis are respectively at the first transmitted light X2 photocentre extended line
When upper, it can ensure that the first transmitted light X2, still being capable of edge after the second concavees lens 5a, the second convex lens 5b is passed through successively
Straightline propagation.
Wherein, by one in potassium titanium oxide phosphate or three lithium borates on the first frequency-doubling crystal 1 and/or the second frequency-doubling crystal 4
The crystal for the mixture that the crystal or two kinds of materials that kind material is formed are formed is made.Wherein,
Potassium titanium oxide phosphate（KTP）Crystal be it is a kind of have excellent nonlinear optical property, obtained extensive attention and application
Nonlinear optical crystal.Ktp crystal is positive photosensitiveness twin crystal, and its transmission region is 350nm~4.5um, it is possible to achieve
1.064um neodymium ions laser and its all band laser freuqency doubling and frequency, the non-colinear position of optical parametric oscillation（Typically use II class position
Match）.Its nonlinear factor d31, d32, d33 are respectively 1.4,2.65 and 10.7pm/V, d33 are more than the 20 of KDP crystal d36
Times.Ktp crystal has higher optic damage threshold value, can be used for middle power laser frequency multiplication etc..Ktp crystal has good mechanicalness
Matter and physicochemical property, not soluble in water and organic solvent, deliquescence, about 1150 DEG C of fusing point, does not have decomposed, the crystal in fusing
Also very big temperature and angle tolerance.Ktp crystal has been widely used for scientific research, technology etc. respectively as frequency converting material
Individual field, especially as the optimal crystal of middle low power frequency multiplication.Frequency multiplier and photoparametric amplifier etc. made of the crystal are
Applied to all solid state tunable laser source.
Three lithium borates（LiB3O5, it is abbreviated as LBO）For frequency-doubling crystal outside outstanding high-power purple, there is wide printing opacity ripple
Section, high damage threshold, big acceptance angle.Its main performance includes：Through wave band：0.165 ~ 3.2 μm, nonlinear factor：
D31=1.05Pm/V, laser damage threshold：25GW/cm2, frequency multiplication transformation efficiency：40~60%（1064nm→532nm）, using model
Enclose：Solid laser system, particularly for high power Nd：YAG two frequencys multiplication, frequency tripling and optical parametric oscillation and amplification etc..
Wherein, the first frequency-doubling crystal 1 and the second frequency-doubling crystal 4 are coated with the anti-reflection film of fundamental frequency light and frequency doubled light.This
In the case of, light during by the first frequency-doubling crystal 1 and the second frequency-doubling crystal 4, light intensity loss due to the introducing of anti-reflection film,
It can be lowered, therefore, it is possible to enable the light by the first frequency-doubling crystal 1 and the second frequency-doubling crystal 4 to realize guarantor as much as possible
Hand down in a direct line from the master and broadcast.
Wherein, the first frequency-doubling crystal 1 is identical with the material of the second frequency-doubling crystal 4.
Wherein, the sectional area of the second frequency-doubling crystal 4 is more than or equal to the half of the sectional area of the first frequency-doubling crystal 1.
In this case, the sectional area of crystal can make light beam all by the way that the bigger price of sectional area of frequency-doubling crystal is higher.By
Facula area at the second frequency-doubling crystal 4 only has the half at the first frequency-doubling crystal 1, so only needing the second frequency-doubling crystal 4
The half that sectional area is more than or equal to the sectional area of the first frequency-doubling crystal 1 can just be such that light beam all passes through.The mesh so done
Be to reduce cost.
Wherein, if the minification of shrink beam microscope group 3 is m, the expansion multiple for expanding microscope group 5 is n, then m=n.It can ensure
Light beam X7 hot spot is evenly distributed.Wherein, if m ≠ n, light beam X4 and light beam X5 spot diameter is different, closes Shu Houhui and changes
Become original spot energy distribution state, make light beam X7 hot spot skewness.
Wherein, form the optical element of shrink beam microscope group 3, form expand be coated with the optical element of microscope group 5 fundamental frequency light and
The anti-reflection film of frequency doubled light.
Wherein, the first half-wave plate 6a, the second half-wave plate 6b wavelength are frequency multiplication optical wavelength.In this case, herein two
The effect of individual half-wave plate is to make to change by two beam frequency multiplication light polarization directions of half-wave plate, so as to realize that two beam frequency doubled lights exist
Conjunction beam output at polarised light Amici prism 7.Wherein light beam X5 is changed into horizontal polarization light after half-wave plate 6b, by half-wave plate
Light beam X4 after 6a is changed into orthogonal polarized light.Half-wave plate has not to be suitable for using wave-length coverage, such as wavelength 1064nm laser
532nm half-wave plate.
Wherein, the anti-reflection film of fundamental frequency light and frequency doubled light is coated with the first half-wave plate 6a, the second half-wave plate 6b.So as to reduce
Light is in the light intensity loss after the first half-wave plate 6a, the second half-wave plate 6b.
Wherein, frequency doubled light anti-reflection film is coated with polarization splitting prism.So as to reduce light after by polarization splitting prism
Light intensity loss.
Wherein, the first spectroscope 2a, the second spectroscope 2b, the 3rd spectroscope 2c reflecting surface are coated with reflectivity>99.5%
Frequency doubled light high-reflecting film, the first spectroscope 2a, the second spectroscope 2b, the 3rd spectroscope 2c two sides are coated with transmitance>99.5%
Fundamental frequency light anti-reflection film.Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creative concept, then other change and modification can be made to these embodiments.So appended claims are intended to be construed to
Including preferred embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of frequency doubling device of laser, it is characterised in that including the first frequency-doubling crystal（1）, the first spectroscope（2a）, second
Spectroscope（2b）, the 3rd spectroscope（2c）, shrink beam microscope group（3）, the second frequency-doubling crystal（4）, expand microscope group（5）, the first half-wave plate
（6a）, the second half-wave plate（6b）And polarization splitting prism（7）,
Incident light（X1）By first frequency-doubling crystal（1）It is incident to first spectroscope（2a）, it is divided by described first
Mirror（2a）Beam splitting is the first transmitted light（X2）With the first reflected light（X3）,
First transmitted light（X2）Pass through the shrink beam microscope group successively（3）, the second frequency-doubling crystal（4）, expand microscope group（5）With
Half of wave plate（6a）After be incident to the 3rd spectroscope（2c）, by the 3rd spectroscope（2c）Beam splitting is the second transmitted light
（X6）With the second reflected light（X4）, second reflected light（X4）It is incident to the polarised light Amici prism（7）And by described inclined
Shake light Amici prism（7）Reflect to form the 3rd reflected light；
First reflected light（X3）It is incident to second spectroscope（2b）, by second spectroscope（2b）Obtained after reflection
4th reflected light（X5）, the 4th reflected light（X5）By second half-wave plate（6b）After be incident to polarised light light splitting
Prism（7）And by the polarised light Amici prism（7）Transmission forms the 3rd transmitted light；
3rd reflected light is collectively forming light beam with the 3rd transmitted light（X7）.
2. the frequency doubling device of laser according to claim 1, it is characterised in that the shrink beam microscope group（3）Including first
Convex lens（3a）With the first concavees lens（3b）,
First transmitted light（X2）First pass through first convex lens（2a）Pass through first concavees lens again afterwards（3b）；
First convex lens（3a）Primary optical axis, first concavees lens（3b）Primary optical axis be respectively at it is described first transmission
Light（X2）Photocentre extended line on.
3. the frequency doubling device of laser according to claim 1, it is characterised in that described to expand microscope group（5）Including second
Concavees lens（5a）With the second convex lens（5b）,
First transmitted light（X2）First pass through second concavees lens（5a）Pass through second convex lens again afterwards（5b）；
Second concavees lens（5a）Primary optical axis, second convex lens（5b）Primary optical axis be respectively at it is described first transmission
Light（X2）Photocentre extended line on.
4. the frequency doubling device of laser according to claim 1, it is characterised in that first frequency-doubling crystal（1）And/or
Second frequency-doubling crystal（4）On the crystal or two kinds of things that are made up of a kind of material in potassium titanium oxide phosphate either three lithium borates
Texture into the crystal of mixture be made.
5. the frequency doubling device of laser according to claim 1, it is characterised in that first frequency-doubling crystal（1）And institute
State the second frequency-doubling crystal（4）Film is thrown in the increasing for being coated with fundamental frequency light and frequency doubled light.
6. the frequency doubling device of laser according to claim 1, it is characterised in that first frequency-doubling crystal（1）And institute
State the second frequency-doubling crystal（4）Material it is identical.
7. the frequency doubling device of laser according to claim 1, it is characterised in that second frequency-doubling crystal（4）Cut
Area is more than or equal to first frequency-doubling crystal（1）Sectional area half.
8. the frequency doubling device of laser according to claim 1, it is characterised in that set the shrink beam microscope group（3）Diminution
Multiple is m, described to expand microscope group（5）Expansion multiple be n, then m=n.
9. the frequency doubling device of laser according to claim 1, it is characterised in that form the shrink beam microscope group（3）Light
Microscope group is expanded described in element, composition（5）Optical element on be coated with the anti-reflection film of fundamental frequency light and frequency doubled light.
10. the frequency doubling device of laser according to claim 1, it is characterised in that first half-wave plate（6a）, second
Half-wave plate（6b）Wavelength be frequency multiplication optical wavelength；
Preferably, first half-wave plate（6a）, the second half-wave plate（6b）On be coated with the anti-reflection film of fundamental frequency light and frequency doubled light；
Preferably, frequency doubled light anti-reflection film is coated with the polarization splitting prism；
Preferably, first spectroscope（2a）, the second spectroscope（2b）, the 3rd spectroscope（2c）Reflecting surface be coated with instead
Penetrate rate>99.5% frequency doubled light high-reflecting film, first spectroscope（2a）, the second spectroscope（2b）, the 3rd spectroscope（2c）Two
Face is coated with transmitance>99.5% fundamental frequency light anti-reflection film.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
| CN113687290A (en) * | 2021-10-27 | 2021-11-23 | 山西大学 | Calibration device and method for weak field of Hall magnetometer based on spin noise spectrum |
| CN115693374A (en) * | 2022-12-30 | 2023-02-03 | 北京东方锐镭科技有限公司 | Laser frequency doubling device |
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| CN103545706A (en) * | 2013-09-02 | 2014-01-29 | 长春理工大学 | All-solid-state 355nm laser |
| CN106684685A (en) * | 2017-02-26 | 2017-05-17 | 中国科学院上海光学精密机械研究所 | Apparatus for improving nonlinear polarized light pump laser efficiency |
| CN106911062A (en) * | 2017-04-13 | 2017-06-30 | 江苏天元激光科技有限公司 | A kind of green glow output optical fibre laser |
| CN207474912U (en) * | 2017-08-24 | 2018-06-08 | 南京先进激光技术研究院 | The frequency doubling device of laser |
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| CN103545706A (en) * | 2013-09-02 | 2014-01-29 | 长春理工大学 | All-solid-state 355nm laser |
| CN106684685A (en) * | 2017-02-26 | 2017-05-17 | 中国科学院上海光学精密机械研究所 | Apparatus for improving nonlinear polarized light pump laser efficiency |
| CN106911062A (en) * | 2017-04-13 | 2017-06-30 | 江苏天元激光科技有限公司 | A kind of green glow output optical fibre laser |
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| CN108199253A (en) * | 2018-01-12 | 2018-06-22 | 北京工业大学 | The device and method of efficient frequency multiplication |
| CN113687290A (en) * | 2021-10-27 | 2021-11-23 | 山西大学 | Calibration device and method for weak field of Hall magnetometer based on spin noise spectrum |
| CN115693374A (en) * | 2022-12-30 | 2023-02-03 | 北京东方锐镭科技有限公司 | Laser frequency doubling device |
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