CN207895209U - A kind of frequency tripling optical frequency converter - Google Patents
A kind of frequency tripling optical frequency converter Download PDFInfo
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- CN207895209U CN207895209U CN201721529562.0U CN201721529562U CN207895209U CN 207895209 U CN207895209 U CN 207895209U CN 201721529562 U CN201721529562 U CN 201721529562U CN 207895209 U CN207895209 U CN 207895209U
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Abstract
Include beam splitter, BBO (the β BaB being sequentially placed along paths direction the utility model is related to a kind of frequency tripling optical frequency converter2O4) crystal, quarter-wave plate, total reflective mirror.Relatively traditional bicrystal cascades frequency tripling, and the utility model only uses one block of nonlinear optical crystal, and at low cost, service band is wide.Relatively existing KDP, ADP crystalloid, GdxY1 xCOB crystal, the utility model using do not deliquesce, nonlinear factor bigger, the ultraviolet anti-higher existing bbo crystal of light injury threshold, the significant advantages such as manufactured monocrystal cascade frequency tripler has high conversion efficiency, output energy is big, application band is wide.
Description
Technical field
The utility model is related to a kind of frequency tripling optical frequency converters, belong to laser and nonlinear optical technology field.
Background technology
Currently, body block nonlinear optics (NLO) crystal is still the main medium converted on optical frequency, it is more commonly used
There are KTP, KDP, BBO, LBO etc..For the frequency tripling (THG) of near-infrared laser, generally use cascades conversion system and realizes, tradition
In the case of need two blocks of nonlinear optical crystals：First piece of crystal generates frequency multiplication wave (SHG), and second piece to fundamental wave and frequency multiplication wave
It carries out and frequently (SFG), generates frequency tripling wave.
Chinese patent literature CN105911793A discloses a kind of cascade optical frequency converter based on monolithic phosphate crystal
And its application.The optical frequency converter, include the first beam splitter being arranged along optical path direction, phosphate crystal, polarization conversion module,
Second beam splitter and third beam splitter.The utility model utilizes a quarter using phosphate crystal as nonlinear optical medium
Wave plate changes frequency multiplication polarization state, and the cascade frequency conversion of frequency multiplication, frequency tripling is carried out using light path of turning back, is realized in one piece of crystal
Direct output from near-infrared laser to ultraviolet laser；
Chinese patent literature CN105549295A, which is disclosed, a kind of having both noncritical phase matching frequency multiplication, frequency tripling performance
Ultraviolet laser frequency conversion device and its working method, including fundamental frequency light source, shrink beam system, the first speculum, nonlinear optical crystal, four
/ mono- wave plate, the second speculum and filter plate, the angular bisector of nonlinear optical crystal X-axis and Z axis, the polarization with fundamental frequency light
The angle in direction is 0-5 °, and the angle of the optical axis direction of quarter-wave plate and the polarization direction of fundamental frequency light is 0-5 °；First is anti-
The angle for penetrating mirror and the central shaft of light path is 35-55 °；Nonlinear optical crystal is GdxY1-xCOB crystal, when fundamental frequency light wavelength
For 1064nm when, the value range of x is 0.18-0.22, and as a length of 1053nm of fundamental light wave, the value range of x is 0.11-
0.15。
Above-mentioned two patent documents disclose two kinds of dresses that triple-harmonic filling is only realized with one block of nonlinear optical crystal
It sets, is respectively applied to KDP, ADP class and GdxY1-xCOB crystal.These types of crystal common trait is：Its frequency multiplication with and frequency
Best tangential (i.e. effective maximum direction of nonlinear second-order optical susceptibility) is more close.For KDP, ADP crystalloid, cutting angle
In principal plane near (θ=60 °, φ=0 °), the cascade frequency tripling realized successively is made of II classes frequency multiplication and II classes and frequency.
For GdxY1-xCOB crystal, cutting angle main shaft Y, on, i.e., (θ=90 °, φ=90 °), be noncritical phase matching direction, institute
The cascade frequency tripling of realization is successively made of II classes frequency multiplication and I classes and frequency.Generally speaking, effective nonlinear optics of above-mentioned crystal
Coefficient is not generally high, and KDP, ADP crystalloid have a deliquescence performance, and GdxY1-xCOB crystal is high, ultraviolet according to lazyness to component
Easily occurs grey mark damage when light irradiation, these factors limit the application of above-mentioned device to some extent, by finding newly non-
Linear crystal and cut type are expected to make up above-mentioned deficiency.
Invention content
For deliquesced present in existing monocrystal cascade frequency tripling technology, nonlinear factor is small, anti-light injury threshold is low etc.
Problem,
The utility model devises a kind of frequency tripling optical frequency converter, it can be achieved that efficient cascade frequency tripling exports.
Utility model is summarized：
The utility model devises a kind of frequency tripling optical frequency converter, efficiently exports ultraviolet or purple frequency tripling light.This
The effect of kind optical frequency converter is better than ADP, KDP, Gd for announcing before thisxY1-xCOB crystal.
The technical solution of the utility model is：
A kind of frequency tripling optical frequency converter includes beam splitter, the BBO (β-BaB being sequentially placed along paths direction2O4)
Crystal, quarter-wave plate, total reflective mirror.
Fundamental frequency light is incident on across the beam splitter on the bbo crystal, and the bbo crystal converts fundamental frequency light to frequency multiplication
Light, frequency doubled light are incident on the quarter-wave plate with remaining fundamental frequency light, and remaining fundamental frequency light is totally reflected, and frequency doubled light is by being all-trans
Mirror passes twice through the quarter-wave plate back and forth, with the remaining fundamental frequency light that is totally reflected by the quarter-wave plate described
Backpropagation in bbo crystal realizes I classes and frequency, generates the frequency tripling wave of fundamental frequency light, after leaving the bbo crystal, backpropagation
Frequency tripling wave detached at beam splitter with remaining fundamental wave, remaining frequency multiplication wave, exported after reflection.
Preferred according to the utility model, the frequency tripling optical frequency converter further includes eyeglass, and the eyeglass is arranged in institute
It states between bbo crystal and the quarter-wave plate, the eyeglass is coated with fundamental frequency light anti-reflection film, frequency doubled light high-reflecting film.
The advantage designed herein is, eyeglass substitutes the function of quarter-wave plate reflection fundamental frequency, both reduced four/
The plated film requirement of one wave plate, and reduce the laser energy that quarter-wave plate is born, be conducive to improve job stability, carry
Rise frequency tripling output.
It is preferred according to the utility model, it is coated on the thang-kng surface of the quarter-wave plate towards the total reflective mirror
Fundamental frequency light high-reflecting film.
The advantage designed herein is, substitutes the function of total reflective mirror reflection frequency multiplication, can save total reflective mirror in this way, both save
Production cost, and reduce frequency converter size, while the optical path difference that fundamental frequency light and frequency doubled light are propagated in the optical path being dropped to most
It is low, be conducive to the raising of frequency tripling transfer efficiency, be conducive to the use of femtosecond magnitude ultrashort pulse fundamental frequency light.
Preferred according to the utility model, bbo crystal thang-kng end face is coated with broadband anti-reflection film after polishing.To subtract
Small loss.
It is preferred according to the utility model, it is plated on the thang-kng surface of the quarter-wave plate towards the bbo crystal
There are fundamental frequency light high-reflecting film and frequency doubled light anti-reflection film, is coated on the thang-kng surface of the quarter-wave plate towards the total reflective mirror
Fundamental frequency light anti-reflection film.
Preferred according to the utility model, it is in the tilted-putted harmonic wave separation device of 45° angle, plating that the beam splitter, which is with light path,
There are fundamental frequency light, frequency doubled light anti-reflection film and frequency tripling high-reflecting film.
It is preferred according to the utility model, it is coated on the thang-kng surface of the total reflective mirror towards the quarter-wave plate
Fundamental frequency light high-reflecting film.
The working method of above-mentioned frequency tripling optical frequency converter, including：
(1) fundamental frequency light is incident on after passing through beam splitter on the bbo crystal；It is brilliant that the bbo crystal will be incident on the BBO
Internal fundamental frequency light is converted into frequency doubled light；
(2) frequency doubled light that step (1) generates is incident on the quarter-wave plate for the first time with remaining fundamental frequency light；Described
Quarter-wave plate front surface residue fundamental frequency light is totally reflected；Frequency doubled light enters described be all-trans after passing through the quarter-wave plate
Mirror；
(3) under the action of the total reflective mirror, frequency doubled light passes twice through four points back and forth for the second time by quarter-wave plate
One of wave plate, total phase delay be π, after frequency doubled light second is by quarter-wave plate, the linear polarization of frequency doubled light is along bbo crystal
Slow axis be rotated by 90 °, with the remaining fundamental frequency light that is totally reflected by the quarter-wave plate in step (2) in the bbo crystal
Backpropagation realizes I classes and frequency, generates the frequency tripling wave of fundamental frequency light；
(4) after leaving the bbo crystal, the frequency tripling wave of backpropagation is with remaining fundamental wave, remaining frequency multiplication wave described
It detaches at beam splitter, is exported after reflection.
The beneficial effects of the utility model are：
1, relatively traditional bicrystal cascades frequency tripling, and the utility model only uses one block of nonlinear optical crystal, cost
Low, service band is wide.
2, relatively existing KDP, ADP crystalloid, GdxY1-xCOB crystal, the utility model use and do not deliquesce, is non-linear
There is conversion to imitate for coefficient bigger, the ultraviolet anti-higher existing bbo crystal of light injury threshold, manufactured monocrystal cascade frequency tripler
The significant advantages such as rate is high, output energy is big, application band is wide.
Description of the drawings
Fig. 1 is the utility model frequency tripling optical frequency converter structure and polarization schematic diagram.
Specific implementation mode
The utility model is further qualified with embodiment with reference to the accompanying drawings of the specification, but not limited to this.
Embodiment 1
A kind of frequency tripling optical frequency converter, as shown in Figure 1, including beam splitter, the BBO being sequentially placed along paths direction
Crystal, quarter-wave plate, total reflective mirror；
The angle of the linear polarization of incident fundamental frequency light and the o axis directions of bbo crystal is 35.3 °.
Fundamental frequency light source is the Nd of 1064nm:YAG laser：
It is in the tilted-putted harmonic wave separation device of 45° angle that beam splitter, which is with light path, is coated with 1064nm, 532nm anti-reflection film, and
355nm high-reflecting films；
Bbo crystal thang-kng end face is plated with broadband anti-reflection film after polishing.To reduce loss；
The optical axis of quarter-wave plate and the angle of incident frequency multiplication light polarization direction are 45 °, and frequency doubled light passes through four points back and forth
One of wave plate rear polarizer direction be rotated by 90 °.It is anti-it to be coated with 1064nm high on the thang-kng surface of the quarter-wave plate towards bbo crystal
Film and 532nm anti-reflection films are coated with 532nm anti-reflection films on the thang-kng surface of the quarter-wave plate towards total reflective mirror.
Total reflective mirror is anti-to 532nm high.
Embodiment 2
A kind of frequency tripling optical frequency converter, include the beam splitter being sequentially placed along paths direction, bbo crystal, four points
One of wave plate, total reflective mirror；
Fundamental frequency light source is the Nd of 1053nm:Glass laser：
It is in the tilted-putted harmonic wave separation device of 45° angle that beam splitter, which is with light path, is coated with 1053,526nm anti-reflection films, and
351nm high-reflecting films；
Bbo crystal thang-kng end face is plated with broadband anti-reflection film after polishing.To reduce loss；
It is coated with 1053nm high-reflecting films and 526nm anti-reflection films on the thang-kng surface of the quarter-wave plate towards bbo crystal,
It is coated with 526nm anti-reflection films towards the thang-kng surface of the quarter-wave plate of total reflective mirror.
Total reflective mirror is anti-to 526nm high.
Embodiment 3
A kind of frequency tripling optical frequency converter, include the beam splitter being sequentially placed along paths direction, bbo crystal, four points
One of wave plate, total reflective mirror；
Fundamental frequency light source is the titanium precious stone laser of 800nm：
It is in the tilted-putted harmonic wave separation device of 45° angle that beam splitter, which is with light path, is coated with 800,400nm anti-reflection films, and
267nm high-reflecting films；
Bbo crystal thang-kng end face is plated with broadband anti-reflection film after polishing.To reduce loss；
It is coated with 800nm high-reflecting films and 400nm anti-reflection films on the thang-kng surface of the quarter-wave plate towards bbo crystal,
It is coated with 400nm anti-reflection films towards the thang-kng surface of the quarter-wave plate of total reflective mirror.
Total reflective mirror is anti-to 400nm high.
Embodiment 4
According to a kind of frequency tripling optical frequency converter described in embodiment 1, difference lies in,
One 1064nm high is anti-, 532nm high is saturating eyeglass is placed between bbo crystal and quarter-wave plate, is substituted
Quarter-wave plate reflects the function of fundamental frequency, and two light pass surfaces of such quarter-wave plate all plate 532nm anti-reflection films, both
The plated film requirement of wave plate is reduced, and reduces the laser energy that wave plate is born, is conducive to improve job stability, promotes three
Frequency multiplication exports.
Embodiment 5
According to a kind of frequency tripling optical frequency converter described in embodiment 1, difference lies in quarter-wave plate direction is all-trans
The thang-kng surface for penetrating mirror changes plating 532nm high-reflecting films, substitutes the function of total reflective mirror reflection frequency multiplication, can save total reflective mirror in this way, both
The optical path difference saved production cost, and reduced frequency converter size, while fundamental frequency light and frequency doubled light being propagated in the optical path drops
To minimum, be conducive to the raising of frequency tripling transfer efficiency, be conducive to the use of femtosecond magnitude ultrashort pulse fundamental frequency light.
Claims (6)
1. a kind of frequency tripling optical frequency converter, which is characterized in that include beam splitter, the BBO being sequentially placed along paths direction
Crystal, quarter-wave plate, total reflective mirror；It is in the tilted-putted harmonic wave separation device of 45° angle that the beam splitter, which is with light path, is coated with base
Frequency light, frequency doubled light anti-reflection film and frequency tripling high-reflecting film.
2. a kind of frequency tripling optical frequency converter according to claim 1, which is characterized in that the frequency tripling optical frequency converter
Further include eyeglass, the eyeglass is arranged between the bbo crystal and the quarter-wave plate, and the eyeglass is coated with fundamental frequency light
Anti-reflection film, frequency doubled light high-reflecting film.
3. a kind of frequency tripling optical frequency converter according to claim 1, which is characterized in that in the institute towards the total reflective mirror
The thang-kng surface for stating quarter-wave plate is coated with fundamental frequency light high-reflecting film.
4. a kind of frequency tripling optical frequency converter according to claim 1, which is characterized in that bbo crystal thang-kng end face
On be coated with broadband anti-reflection film.
5. a kind of frequency tripling optical frequency converter according to claim 1, which is characterized in that towards the bbo crystal
The thang-kng surface of the quarter-wave plate is coated with fundamental frequency light high-reflecting film and frequency doubled light anti-reflection film, in the institute towards the total reflective mirror
The thang-kng surface for stating quarter-wave plate is coated with fundamental frequency light anti-reflection film.
6. according to any a kind of frequency tripling optical frequency converter of claim 1,4-5, which is characterized in that towards described four
The thang-kng surface of the total reflective mirror of/mono- wave plate is coated with fundamental frequency light high-reflecting film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721529562.0U CN207895209U (en) | 2017-11-16 | 2017-11-16 | A kind of frequency tripling optical frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111897135A (en) * | 2020-07-16 | 2020-11-06 | 江苏维福特科技发展股份有限公司 | Method for generating 180nm-290nm deep ultraviolet light |
| CN112271544A (en) * | 2020-09-10 | 2021-01-26 | 武汉光谷航天三江激光产业技术研究院有限公司 | Optical parametric oscillator of random polarization pump |
-
2017
- 2017-11-16 CN CN201721529562.0U patent/CN207895209U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111897135A (en) * | 2020-07-16 | 2020-11-06 | 江苏维福特科技发展股份有限公司 | Method for generating 180nm-290nm deep ultraviolet light |
| CN112271544A (en) * | 2020-09-10 | 2021-01-26 | 武汉光谷航天三江激光产业技术研究院有限公司 | Optical parametric oscillator of random polarization pump |
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