CN207338896U - The non-linear optical frequency converter of self-spectroscopic - Google Patents
The non-linear optical frequency converter of self-spectroscopic Download PDFInfo
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- CN207338896U CN207338896U CN201721352321.3U CN201721352321U CN207338896U CN 207338896 U CN207338896 U CN 207338896U CN 201721352321 U CN201721352321 U CN 201721352321U CN 207338896 U CN207338896 U CN 207338896U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 42
- 239000013078 crystal Substances 0.000 claims abstract description 116
- VGTPKLINSHNZRD-UHFFFAOYSA-N oxoborinic acid Chemical compound OB=O VGTPKLINSHNZRD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000012528 membrane Substances 0.000 claims description 12
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 230000003667 anti-reflective effect Effects 0.000 claims description 5
- 238000002050 diffraction method Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 4
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 229910052796 boron Inorganic materials 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- NNAZVIPNYDXXPF-UHFFFAOYSA-N [Li+].[Cs+].OB([O-])[O-] Chemical compound [Li+].[Cs+].OB([O-])[O-] NNAZVIPNYDXXPF-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- QBLDFAIABQKINO-UHFFFAOYSA-N barium borate Chemical compound [Ba+2].[O-]B=O.[O-]B=O QBLDFAIABQKINO-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
A kind of non-linear optical frequency converter of self-spectroscopic is the utility model is related to, is made of Part I uniaxial crystal and Part II uniaxial crystal, it is characterised in that：Part I uniaxial crystal and the uniaxial crystal that Part II uniaxial crystal is identical material, uniaxial crystal is metaboric acid system uniaxial crystal, and Part I uniaxial crystal and Part II uniaxial crystal are bonded to a bulk crystals；Bulk crystals have 5 characteristic faces, 5 characteristic faces are polished by optical precision, wherein Part I uniaxial crystal is frequency multiplication part, frequency multiplication part includes fisrt feature face, second feature face and third feature face, further include the principal plane A that optimal frequency multiplication matching angle θ directions are formed with Part I crystal z-axis；It realizes separation frequency doubled light and two functions of fundamental frequency light in optical frequency translation and crystal at the same time, the short wavelength laser that frequency multiplication produces is set to be emitted with diverse location of the fundamental frequency light in crystal, avoid short wavelength laser and go out the damage influence of optical interface to crystal to fundamental frequency light, it is applicable to laser cavity external frequency multiplication to be readily applicable in intracavity frequency doubling, insertion loss is low.
Description
Technical field
A kind of non-linear optical frequency converter of self-spectroscopic is the utility model is related to, belongs to a kind of optical instrument.
Background technology
Short-wave laser in solid state laser at present（Wavelength is less than 400nm）Mainly swashing by visible ray and near infrared band
Light is produced, the short-wave laser meeting and fundamental frequency light that frequency multiplication produces in this course as fundamental frequency light by nonlinear effect frequency multiplication
It is emitted at the same time from the same position of nonlinear crystal.Since the photon energy of short-wave laser is higher, easily go out optical interface in crystal
Aging Damage is caused, and then increases the loss of fundamental frequency light, causes shg efficiency in laser cavity to be remarkably decreased.The technology of the present invention can be with
Shortwave frequency doubled light is separated with fundamental frequency light before handing-over interface of the crystal with air is transferred to, the damage of short-wave laser can be avoided
Influence of the mechanism to fundamental frequency light, reduces the loss of fundamental frequency light, since the loss increase of fundamental frequency light is to cause laser power to be decayed
Major influence factors, can dramatically increase service life of ultraviolet laser in this way.
It is main using directly incident nonlinear crystal and then same light path outgoing in short-wave laser nonlinear frequency transformation technology
Mode, fundamental frequency light is transmitted with the frequency doubled light same light path that nonlinear transformation produces in the program, and shortwave inevitably occurs
Damage from laser transmission medium simultaneously causes the increase of fundamental frequency light loss, and then causes laser power to decline.
The content of the invention
The object of the present invention is to provide a kind of non-linear optical frequency converter of self-spectroscopic, its realize at the same time optical frequency translation and
Separation frequency doubled light and two functions of fundamental frequency light in crystal, make the short wavelength laser that frequency multiplication produces from fundamental frequency light in the different positions of crystal
Outgoing is put, short wavelength laser is avoided and goes out the damage influence of optical interface to crystal to fundamental frequency light, is applicable to outside laser chamber times
Frequency is readily applicable in intracavity frequency doubling, and insertion loss is low.
What the technical solution of the utility model was realized in：The non-linear optical frequency converter of self-spectroscopic, by Part I
Uniaxial crystal and Part II uniaxial crystal composition, it is characterised in that：Part I uniaxial crystal and Part II uniaxial crystal
For the uniaxial crystal of identical material, uniaxial crystal is metaboric acid system uniaxial crystal, Part I uniaxial crystal and Part II list
Axialite body is bonded to a bulk crystals；Bulk crystals have 5 characteristic faces, and 5 characteristic faces are polished by optical precision, its
Middle Part I uniaxial crystal is frequency multiplication part, and frequency multiplication part includes fisrt feature face, second feature face and third feature face, also
The principal plane A formed including optimal frequency multiplication matching angle θ directions and Part I crystal z-axis；
Part II crystal is from light splitting part, from spectrum part subpackage face containing fourth feature and fifth feature face, from light splitting
Partial z-axis while the principal plane of crystal A parallel to frequency multiplication part and fourth feature face；Fisrt feature face is the plane of incidence, fundamental frequency
Light is to meet that the optimal frequency doubling nonlinear matching angle θ directions of crystal enter crystal double frequency part, from the crystallography optical axis for being divided part
It is parallel with the principal plane A of frequency multiplication part and vertical with the fundamental frequency light Optimal Nonlinear matching angle θ directions of frequency multiplication part；Second is special
Sign face and the angle of principal plane A are θm, third feature face and the angular range in second feature face are [90 ° of+θm- atan（n0/
n1）] extremely（90°-θm）, n0 is the aerial refractive index of fundamental frequency light, and n1 is refractive index of the fundamental frequency light in crystal double frequency part, times
Frequency partial crystals with the interface M from light splitting partial crystals by fourth feature face with second feature face by bonding together to form, i.e., the
Two characteristic faces are overlapped with fourth feature face with interface M, and interface M both sides are respectively frequency multiplication partial crystals and light splitting part is brilliant certainly
Body, fifth feature face are fundamental frequency light-emitting face, are [90 ° of-atan with principal plane A angles（n0/n2）], the surface in fifth feature face
Evaporation has one layer of fundamental frequency light antireflective film.N0 is the aerial refractive index of fundamental frequency light, and n2 is divided part certainly for fundamental frequency light in crystal
Refractive index；
The fundamental frequency light Optimal Nonlinear matching angle θ directions of frequency multiplication part form main flat with the crystallography optical axis of the frequency multiplication part
Face A, then the angle of the interface M and principal plane A is θm, the pass between second feature face and fourth feature face and principal plane A
It is for θm≤[90°-asin（n4/n3）], n3 be frequency doubled light crystal double frequency part refractive index, n4 for frequency doubled light crystal from
It is divided the refractive index of part.
The fisrt feature face, in second feature face and third feature face, can set 0 to 10 plane between each two face
Corresponding polyhedron is formed, but does not influence the correlation and function of 3 characteristic faces, it is believed that is decorative processing.
The fourth feature face, can set between fifth feature face 0 to 10 plane to form corresponding polyhedron, but not shadow
Ring the correlation and function of 3 characteristic faces, it is believed that be decorative processing.
Light is passed through in fisrt feature face, second feature face, third feature face, fourth feature face and the fifth feature face
Precise polished processing is learned, face type error is due to λ/4, surface roughness Ra ＜ 0.5nm.
The uniaxial crystal can replace with borate-based uniaxial crystal CLBO by metaboric acid system uniaxial crystal β-BBO.
One layer of first membrane system can be deposited on the fisrt feature face, one layer of second membrane system can be deposited on third feature face,
One layer of tertiary membrane system can be deposited on fifth feature face.
The good effect of the utility model is that it realizes separation frequency doubled light and fundamental frequency light in optical frequency translation and crystal at the same time
Two functions, make the short wavelength laser that frequency multiplication produces be emitted with diverse location of the fundamental frequency light in crystal, avoid short wavelength laser
Go out the damage influence of optical interface to crystal to fundamental frequency light, be applicable to laser cavity external frequency multiplication and be readily applicable to intracavity frequency doubling
In, insertion loss is low.
Brief description of the drawings
Fig. 1 is the overall structure figure of the utility model.
Fig. 2 is the Part I uniaxial crystal structure figure of the utility model.
Fig. 3 is the Part II uniaxial crystal structure figure of the utility model.
Fig. 4 is the structure chart that the utility model uses six cesium lithium borate CLBO uniaxial crystals.
Fig. 5 is the Part I uniaxial crystal structure figure that the utility model uses six cesium lithium borate CLBO.
Fig. 6 is the Part II uniaxial crystal structure figure that the utility model uses six cesium lithium borate CLBO.
Fig. 7 is the non-linear optical frequency transformer configuration figure of the utility model self-spectroscopic.
Fig. 8 is the Part I uniaxial crystal structure figure of the non-linear optical frequency converter of the utility model self-spectroscopic.
Fig. 9 is the Part II uniaxial crystal structure figure of the non-linear optical frequency converter of the utility model self-spectroscopic.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：As shown in Figs. 1-3, the non-linear optical frequency of self-spectroscopic becomes
Parallel operation, is made of Part I uniaxial crystal 1 and Part II uniaxial crystal 2, it is characterised in that：Part I uniaxial crystal 1
With the uniaxial crystal that Part II uniaxial crystal 2 is identical material, uniaxial crystal is metaboric acid system uniaxial crystal, Part I list
Axialite body 1 and Part II uniaxial crystal 2 are bonded to a bulk crystals；Bulk crystals have 5 characteristic faces, 5 characteristic faces
Polished by optical precision, wherein Part I uniaxial crystal 1 is frequency multiplication part, and frequency multiplication part includes fisrt feature face 11,
Second feature face 12 and third feature face 13, further include the master that optimal frequency multiplication matching angle θ directions are formed with Part I crystal z-axis
Plane A；
Part II crystal be from light splitting part, from spectrum part subpackage face containing fourth feature 24 and fifth feature face 25, oneself
It is divided the z-axis of part while the principal plane of crystal A parallel to frequency multiplication part and fourth feature face 24；Fisrt feature face 11 be into
Face is penetrated, fundamental frequency light is to meet that the optimal frequency doubling nonlinear matching angle θ directions of crystal enter crystal double frequency part, from the knot for being divided part
Crystalline substance optical axis is parallel with the principal plane A of frequency multiplication part, and hangs down with the fundamental frequency light Optimal Nonlinear matching angle θ directions of frequency multiplication part
Directly；The angle of second feature face 12 and principal plane A is θm, the angular range in third feature face 13 and second feature face 12 is [90 °
+θm- atan（n0/n1）] extremely（90°-θm）, n0 is the aerial refractive index of fundamental frequency light, and n1 is fundamental frequency light in crystal double frequency portion
The refractive index divided, frequency multiplication partial crystals are with the interface M from light splitting partial crystals by fourth feature face 24 and second feature face 12
By bonding together to form, i.e., second feature face 12 is overlapped with fourth feature face 24 with interface M, and interface M both sides are respectively frequency multiplication
Partial crystals and certainly light splitting partial crystals, fifth feature face 25 is fundamental frequency light-emitting face, is [90 ° of-atan with principal plane A angles
（n0/n2）], the surface evaporation in fifth feature face 25 has one layer of fundamental frequency light antireflective film.N0 is the aerial refractive index of fundamental frequency light,
N2 is refractive index of the fundamental frequency light in crystal from light splitting part；
The fundamental frequency light Optimal Nonlinear matching angle θ directions of frequency multiplication part form main flat with the crystallography optical axis of the frequency multiplication part
Face A, then the angle of the interface M and principal plane A is θm, between second feature face 12 and fourth feature face 24 and principal plane A
Relation be θm≤[90°-asin（n4/n3）], n3 is refractive index of the frequency doubled light in crystal double frequency part, and n4 is frequency doubled light in crystalline substance
Refractive index of the body from light splitting part；
The fisrt feature face 11, in second feature face 12 and third feature face 13, can set 0 to 10 between each two face
A plane forms corresponding polyhedron, but does not influence the correlation and function of 3 characteristic faces, it is believed that is decorative place
Reason；
The fourth feature face 14, can set between fifth feature face 25 0 to 10 plane to form corresponding polyhedron, but
The correlation and function of 3 characteristic faces are not influenced, it is believed that are decorative processing；
The fisrt feature face 11, second feature face 12, third feature face 13, fourth feature face 24 and fifth feature face
25 pass through optical precision polishing treatment, and face type error is due to λ/4, surface roughness Ra ＜ 0.5nm；
The uniaxial crystal can replace with borate-based uniaxial crystal CLBO by metaboric acid system uniaxial crystal β-BBO.
One layer of first fundamental frequency light anti-reflection membrane system 3 can be deposited on the fisrt feature face 11, can be steamed on third feature face 13
One layer of second fundamental frequency light anti-reflection membrane system 4 is plated, one layer of the 3rd fundamental frequency light anti-reflection membrane system 5 can be deposited on fifth feature face 25.
266nm Ultra-Violet Lasers are obtained using barium metaborate β-BBO frequency multiplication 532nm laser：
As shown in Figure 1, optimum phase matching direction θ is about 47.7 °, refractive index of the frequency multiplication part bbo crystal for 532nm
N1 is about 1.67, and the refractive index n3 for 473nm is about 1.67, is about for the refractive index of 532nm from part BBO is divided
1.67, the refractive index n4 for 473nm are about that 1.62, n0 equal to 1 is the aerial refractive index of two light;Along Optimal Nonlinear
As fundamental frequency light, 3 direction of the first membrane system for having 532nm antireflective films by evaporation enters the 532nm laser of 47.7 ° of direction incidence of matching angle
It is mapped in crystal, frequency multiplication produces 266nm frequency doubled lights, when two light are transferred to interface M together, due to interface M's and principal plane A
Angle thetam≤[90°-asin（n4/n3）], i.e. θm≤ 15.25 ° of conditions for meeting to make 266nm laser experiences total internal reflections, so
It is emitted after 266nm frequency multiplication light total reflections by third feature face 13,532nm fundamental frequency lights continue to be transferred to from light splitting part, there is the 5th
Characteristic face 25 is emitted.
As shown in Fig. 2, when the evaporation of fisrt feature face 11 has the first fundamental frequency light anti-reflection membrane system 3, fisrt feature face 11 and frequency multiplication
Part principal plane A angles exist（0-90°）Interior, second feature face 12 is overlapped with interface M, i.e., takes θ with principal plane A anglesm, frequency multiplication
Any number of planes can be set to form corresponding polyhedron in part between each two face, but do not influence 3 spies of frequency multiplication part
The correlation and function in sign face, it is believed that be decorative processing；
As shown in figure 3, when the evaporation of fifth feature face 25 has the 3rd fundamental frequency light antireflective film 5 to be, and fifth feature face 25 with
Frequency multiplication part principal plane A angles exist（0-90°）It is interior.
473nm blue lasers are obtained using six cesium lithium borate CLBO frequency multiplication 946nm laser：
As shown in figure 4, optimum phase matching direction θ is about 31.4 °, refraction of the frequency multiplication part clbo crystal for 946nm
Rate n1 is about 1.49, and the refractive index n3 for 473nm is about 1.49, is about for the refractive index of 946nm from part CLBO is divided
1.49, the refractive index n4 for 473nm are about that 1.45, n0 equal to 1 is the aerial refractive index of two light.946nm laser conducts
Fundamental frequency light, by Brewster angle atan（n1/n0）, i.e. about 56.1 ° of directions incide fisrt feature face 11, the base after being reflected into crystal
Frequency light is transmitted along 31.4 ° of directions of Optimal Nonlinear matching angle, produces 473nm frequency doubled lights, when two light are transferred to interface M together,
Due to the angle theta of interface M and principal plane Am≤[90°-asin（n4/n3）], i.e. θm≤ 13.1 ° meet 473nm laser occurs
The condition of total internal reflection, so being emitted after 473nm frequency multiplication light total reflections by third feature face 13,946nm fundamental frequency lights continue to transmit
To from light splitting part, with atan (n0/n1), i.e., about 33.9 ° are incided and are emitted on fifth feature face 25 with Brewster angle.
As shown in figure 5, the not plated film, and fisrt feature face 11 is by clockwise after surface optical polishes of fisrt feature face 11
Direction and principal plane A angles are [90 ° of-atan（n0/n1）], third feature face 13 is frequency multiplication light-emitting face, the folder with interface M
Angular region is（90°+θm- atan（n0/n1））Extremely（90°-θm）, can wherein set any number of planes to form between each two face
Corresponding polyhedron, but the correlation and function of this described 3 characteristic faces are not influenced, it is believed that it is decorative processing；
As shown in fig. 6, the not plated film of fifth feature face 25, only does surface optical polishing, when fourth feature face 24 and frequency multiplication portion
When the fisrt feature face 12 divided is bonded, fifth feature face 25 is in the clockwise direction [90 ° of-atan with principal plane A angles（n0/
n2）]；
As shown in fig. 7, the fundamental frequency light of the non-linear optical frequency converter of self-spectroscopic by counterclockwise with principal plane A angles
For [90 ° of-atan（n0/n1）] fisrt feature face 11 enter to inject the non-linear optical frequency converter of the self-spectroscopic, in frequency multiplication portion
Divide and produce frequency doubled light, when then fundamental frequency light is transferred to interface M together with frequency doubled light, frequency doubled light experiences total internal reflection, by being deposited
The third feature face 13 for having the second fundamental frequency light anti-reflection membrane system 4 is emitted, and fundamental frequency light is through interface M by being put down counterclockwise with main
Face A angles are [90 ° of-atan（n0/n2）] fifth feature face 25 be emitted, two light are kept completely separate;
As shown in figure 8, the fisrt feature face 11 of frequency multiplication part-structure not plated film, and described after surface optical polishes
One characteristic face 11 is counterclockwise [90 ° of-atan with principal plane A angles（n0/n1）], it can wherein be set between each two face
Any number of planes form corresponding polyhedron, but do not influence the correlation and function of this described 3 characteristic faces, it is believed that are
Dicoration processing；
As shown in figure 9, the not plated film of fifth feature face 25, only does surface optical polishing, when fourth feature face 24 and frequency multiplication portion
When the second feature face 12 divided is bonded, the fifth feature face 25 is in the counterclockwise direction [90 ° of-atan with principal plane A angles
（n0/n2）].
Claims (6)
1. the non-linear optical frequency converter of self-spectroscopic, is made of Part I uniaxial crystal and Part II uniaxial crystal, it is special
Sign is：Part I uniaxial crystal and the uniaxial crystal that Part II uniaxial crystal is identical material, uniaxial crystal is inclined boron
Acid system uniaxial crystal, Part I uniaxial crystal and Part II uniaxial crystal are bonded to a bulk crystals；Bulk crystals have
There are 5 characteristic faces, 5 characteristic faces are polished by optical precision, and wherein Part I uniaxial crystal is frequency multiplication part, frequency multiplication portion
Subpackage face containing fisrt feature, second feature face and third feature face, it is brilliant with Part I to further include optimal frequency multiplication matching angle θ directions
The principal plane A that body z-axis is formed；
Part II crystal is from light splitting part, from spectrum part subpackage face containing fourth feature and fifth feature face, from light splitting part
Z-axis principal plane of crystal A parallel to frequency multiplication part and fourth feature face at the same time；Fisrt feature face is the plane of incidence, fundamental frequency light with
Meet that the optimal frequency doubling nonlinear matching angle θ directions of crystal enter crystal double frequency part, from the crystallography optical axis for being divided part and again
The principal plane A of frequency part is parallel, and vertical with the fundamental frequency light Optimal Nonlinear matching angle θ directions of frequency multiplication part；Second feature face
Angle with principal plane A is θm, third feature face and the angular range in second feature face are [90 ° of+θm- atan（n0/n1）] extremely
（90°-θm）, n0 is the aerial refractive index of fundamental frequency light, and n1 is fundamental frequency light in the refractive index of crystal double frequency part, frequency multiplication part
Crystal with the interface M from light splitting partial crystals by fourth feature face with second feature face by bonding together to form, i.e. second feature
Face is overlapped with fourth feature face with interface M, and interface M both sides are respectively frequency multiplication partial crystals and are divided partial crystals certainly, the
Five characteristic faces are fundamental frequency light-emitting face, are [90 ° of-atan with principal plane A angles（n0/n2）], the surface evaporation in fifth feature face
There is one layer of fundamental frequency light antireflective film；N0 is the aerial refractive index of fundamental frequency light, and n2 is folding of the fundamental frequency light in crystal from light splitting part
Penetrate rate；
The fundamental frequency light Optimal Nonlinear matching angle θ directions of frequency multiplication part form principal plane A with the crystallography optical axis of the frequency multiplication part,
Then the angle of the interface M and principal plane A is θm, the relation between second feature face and fourth feature face and principal plane A is θm
≤[90°-asin（n4/n3）], n3 is refractive index of the frequency doubled light in crystal double frequency part, and n4 is for frequency doubled light in crystal from spectrum part
The refractive index divided.
2. according to the non-linear optical frequency converter of self-spectroscopic described in claim 1, it is characterised in that the fisrt feature face,
In second feature face and third feature face, 0 to 10 plane is set to form corresponding polyhedron between each two face.
3. according to the non-linear optical frequency converter of self-spectroscopic described in claim 1, it is characterised in that the fourth feature face,
0 to 10 plane is set to form corresponding polyhedron between fifth feature face.
4. according to the non-linear optical frequency converter of self-spectroscopic described in claim 1, it is characterised in that the fisrt feature
Optical precision polishing treatment is passed through in face, second feature face, third feature face, fourth feature face and fifth feature face, and face type misses
Difference is λ/4, surface roughness Ra ＜ 0.5nm.
5. according to the non-linear optical frequency converter of self-spectroscopic described in claim 1, it is characterised in that the uniaxial crystal
Borate-based uniaxial crystal CLBO can be replaced with by metaboric acid system uniaxial crystal β-BBO.
6. according to the non-linear optical frequency converter of self-spectroscopic described in claim 1, it is characterised in that the fisrt feature
One layer of first membrane system can be deposited on face, one layer of second membrane system can be deposited on third feature face, one layer can be deposited on fifth feature face
Tertiary membrane system.
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| CN201721352321.3U CN207338896U (en) | 2017-10-20 | 2017-10-20 | The non-linear optical frequency converter of self-spectroscopic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611769A (en) * | 2017-10-20 | 2018-01-19 | 长春新产业光电技术有限公司 | The non-linear optical frequency converter of self-spectroscopic |
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Cited By (1)
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| CN107611769A (en) * | 2017-10-20 | 2018-01-19 | 长春新产业光电技术有限公司 | The non-linear optical frequency converter of self-spectroscopic |
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Granted publication date: 20180508 |