CN211700924U - Optical frequency comb - Google Patents
Optical frequency comb Download PDFInfo
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- CN211700924U CN211700924U CN202020678830.0U CN202020678830U CN211700924U CN 211700924 U CN211700924 U CN 211700924U CN 202020678830 U CN202020678830 U CN 202020678830U CN 211700924 U CN211700924 U CN 211700924U
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Abstract
The utility model discloses an optical frequency comb, include: the pump source emits a frequency of omegapThe pumping light sequentially passes through the optical isolator, the sampling lens, the first one-half wave plate and the focusing lens and then enters an oscillator consisting of a first concave reflector, a Raman/Brillouin crystal and a second concave reflector; the second concave reflector is arranged on the piezoelectric ceramic displacement platform, backward reflected Raman light enters the frequency locking controller after being reflected by the sampling lens, and the frequency locking controller controls the displacement of the piezoelectric ceramic displacement platform. The product has the utilization frequency of omegapIs excited by pump light of frequency omegaRThe Raman light is used as the intermediate process to excite the generation of the Brillouin laser and the frequency comb, and the structure overcomes the complexity of the traditional direct pumping Brillouin laser and the waveguide type Brillouin frequency comb on the structure design and the limitation on the output power.
Description
Technical Field
The utility model relates to an optics field especially relates to an optical frequency comb.
Background
The optical frequency comb refers to a spectrum consisting of a series of frequency components which are uniformly spaced and have coherent stable phase relation, and is a perfect combination product of ultrafast optics and precision spectroscopy, which has become a further significant breakthrough in the laser technology field after the ultra-short pulse laser comes out. In recent years, the optical frequency comb has attracted the attention of more and more scholars due to the important roles of the optical frequency comb in emerging fields including high-resolution wide-range spectrum in chemical exploration, precise wavelength calibration in external planetary exploration, coherent control in ultra-fast kinetic research and the like.
The optical frequency comb light source is mainly realized by two types: the optical frequency comb is realized based on a mode-locked laser; and the other is a miniaturized and chip-level optical frequency comb realized based on micro resonant cavity and semiconductor laser technology. The first implementation method is mainly divided into two types, i.e., a solid-state system optical frequency comb based on a crystal and an optical frequency comb based on an optical fiber, but since the mode-locked laser has a complicated structure and a large size and is not conducive to miniaturization, the optical frequency comb is expensive and has a limited application range. In the second implementation method, the optical frequency comb based on the semiconductor laser typically generates the optical frequency comb through the quantum cascade laser and the mode-locked vertical cavity semiconductor laser, and the optical frequency comb based on the micro-resonant cavity system broadens the single-frequency pump light into the optical frequency comb through the nonlinear optical four-wave mixing process. In addition, the miniaturization of the optical frequency comb is possible to realize space exploration of landers, distributed spacecrafts, cube satellite spacecrafts and the like in the future, and the method is also worth developing further research in the future.
In recent years, Brillouin Frequency Comb (BFC) based on stimulated brillouin scattering and four-wave mixing technology has become a new mode for generating high-coherence frequency comb with mode spacing of 10GHz magnitude, breaking through the traditional waveguide structure, and realizing generation of free-space brillouin frequency comb has become a great research hotspot.
SUMMERY OF THE UTILITY MODEL
The utility model provides an optical frequency comb, the utility model discloses utilize stimulated Raman scattering, stimulated Brillouin scattering and four-wave mixing nonlinear effect in the diamond crystal, realized free space cascade Brillouin laser operation, finally obtained the optical frequency comb of a high power, overcome material properties and structural design in traditional waveguide type structure to the influence of frequency comb, see the following description for details:
an optical frequency comb, comprising:
the pump source emits a frequency of omegapThe pumping light sequentially passes through the optical isolator, the sampling lens, the first one-half wave plate and the focusing lens and then enters an oscillator consisting of a first concave reflector, a Raman/Brillouin crystal and a second concave reflector;
the second concave reflector is arranged on the piezoelectric ceramic displacement platform, backward reflected Raman light enters the frequency locking controller after being reflected by the sampling lens, and the frequency locking controller controls the displacement of the piezoelectric ceramic displacement platform.
Further, the pump light is linearly polarized light.
The optical isolator consists of a second half-wave plate, a first polarizer, a Faraday rotator, a third half-wave plate and a second polarizer;
the sampling lens is composed of a plane optical glass and reflects part of pumping light and Raman light.
Further, the first concave reflector is a plano-concave reflector, and the surface plating has a frequency of omegapThe pumping light anti-reflection dielectric film and the frequency of the pumping light anti-reflection dielectric film are omegaRThe dielectric film of (3) which highly reflects Raman light.
Wherein the second concave reflector is a plano-concave reflector, and the surface plating has a frequency of omegapThe pumping light is highly reflected dielectric film and the frequency is omegaRIs partially transmissive to the raman light.
Furthermore, the frequency locking controller is composed of an attenuation sheet, a quarter wave plate, a polarization splitting prism, a first photoelectric detector, a second photoelectric detector and a subtracter.
Wherein the optical frequency comb further comprises: a long-pass filter for filtering out omegapThe pump light of (1).
The utility model provides a technical scheme's beneficial effect is:
1. the laser firstly excites Raman laser by pump light, then excites the generation of Brillouin frequency comb by the Raman light, and because the frequency shift of the pump light and the Raman light is larger, compared with the Brillouin frequency comb of direct pumping, the laser greatly reduces the requirements on the coating wavelength and the reflectivity of a cavity mirror of a resonant cavity, and in addition, the threshold value of the Brillouin laser can be effectively controlled, the quantum conversion efficiency of the laser is improved, and the thermal load of a crystal is reduced;
2. the laser forms a free space operation mode through a Raman/Brillouin laser system consisting of a first concave reflector, a Raman/Brillouin crystal and a second concave reflector, overcomes the influence of material characteristics and structural design in a waveguide type structure on frequency combs, controls the cavity length of a resonant cavity through a piezoelectric ceramic displacement platform, can effectively control the orders of cascade Stokes and anti-Stokes light, and further can realize single Brillouin laser output or Brillouin frequency combs with different orders;
3. the laser uses diamond crystal with high thermal conductivity and wide spectrum transmission range as Raman/Brillouin crystal, and can obtain optical frequency comb with higher power and wider wavelength range.
Drawings
FIG. 1 is a schematic diagram of an optical frequency comb;
FIG. 2 is a schematic diagram of an optical isolator;
FIG. 3 is a schematic diagram of a frequency-locking controller;
fig. 4 is a schematic diagram of frequency conversion of a laser.
In the drawings, the components represented by the respective reference numerals are listed below:
1: a pump source; 2: an optical isolator;
3: sampling a lens; 4: a first quarter wave plate;
5: a focusing lens; 6: a first concave mirror;
7: raman/brillouin crystals; 8: a second concave reflector;
9: a long-pass filter; 10: a piezoelectric ceramic displacement platform;
11: a frequency-locking controller; 12: a second half wave plate;
13: a first polarizer; 14: a Faraday rotator;
15: a third half wave plate; 16: a second polarizer;
17: an attenuation sheet; 18: a quarter wave plate;
19: a polarization splitting prism; 20: a first photodetector;
21: a subtractor; 22: a second photodetector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below.
The generation of brillouin frequency comb has been realized by waveguide type structure, but the design and preparation of such structure are relatively complex, especially obtaining low-loss optical acoustic waveguide is still a big challenge, and at the same time, limited by the material and structure characteristics, it is difficult to obtain brillouin laser and brillouin frequency comb with high power. Therefore, the development of a non-waveguide brillouin frequency comb based on free space operation is of great significance for improving the power of the frequency comb.
Based on above technical background, the utility model provides an utilize the diamond crystal that has high brillouin gain and high thermal conductivity as raman/brillouin crystal, the indirect pumping of raman light through the pumping light excitation produces first-order and cascade stimulated brillouin scattering, realizes the production of free space moving high power brillouin frequency comb.
Referring to fig. 1, an optical frequency comb includes: the device comprises a pumping source 1, an optical isolator 2, a sampling lens 3, a first quarter wave plate 4, a focusing lens 5, a first concave reflector 6, a Raman/Brillouin crystal 7, a second concave reflector 8, a long-pass filter 9, a piezoelectric ceramic displacement platform 10 and a frequency locking controller 11.
Wherein the pump source 1 emits a first frequency (ω)p) The linearly polarized light enters an oscillator consisting of a first concave reflector 6, a Raman/Brillouin crystal 7 and a second concave reflector 8 after passing through an optical isolator 2, a sampling lens 3, a first one-half wave plate 4 and a focusing lens 5 in sequence;
the second concave reflector 8 is arranged on the piezoelectric ceramic displacement platform 10; the backward reflected Raman light enters the frequency locking controller 11 after being reflected by the sampling lens 3, the frequency locking controller 11 feeds back a signal to the piezoelectric ceramic displacement platform 10 after monitoring the polarization state change of the incident light, and the piezoelectric ceramic displacement platform 10 moves in real time according to the fed-back signal.
The optical frequency comb realizes free space cascade Brillouin laser operation by using stimulated Raman scattering, stimulated Brillouin scattering and four-wave mixing nonlinear effect in nonlinear optical crystal, and finally filters out omega frequency through a long pass filter 9pThe high-power Brillouin frequency comb is realized by the pump light.
In particular, the first one-half wave plate 4 is used to adjust the polarization direction of the pump light, so that the maximum raman/brillouin gain can be obtained in the raman/brillouin crystal 7. The sampling lens 3 is composed of a plane optical glass and has a pumping light frequency of omegaRThe raman light of (the second frequency) is partially reflected. The first concave reflector 6 is a plano-concave mirror with a surface plating pair frequency of omegapThe pumping light anti-reflection dielectric film and the frequency of the pumping light anti-reflection dielectric film are omegaRThe dielectric film of (3) which highly reflects Raman light. The second concave reflector 8 is a plano-concave mirror with a surface plating pair frequency of omegapThe pumping light is highly reflected dielectric film and the frequency is omegaRIs partially transmissive to the raman light.
Referring to fig. 2, the optical isolator 2 is used for unidirectional passage of pump light to protect the pump laser, and is composed of a second half-wave plate 12, a first polarizer 13, a faraday rotator 14, a third half-wave plate 15 and a second polarizer 16; the continuous adjustment of the power of the pump light incident into the Raman/Brillouin crystal 7 can be realized under the condition of not changing the quality of the pump light beam and the size of a light spot by adjusting the second half-wave plate 12.
Referring to fig. 3, the frequency-locking controller 11 is configured to convert the measured polarized light signal into an electrical signal, perform subtraction operation, and send the electrical signal to the piezoelectric ceramic displacement platform 10, so as to realize fine adjustment of the length of the raman/brillouin cavity by the piezoelectric ceramic displacement platform 10. The frequency-locking controller 11 is composed of an attenuation plate 17, a quarter-wave plate 18, a polarization splitting prism 19, a first photodetector 20, a subtracter 21 and a second photodetector 22.
Referring to fig. 4, the pump source 1 emits a frequency ωpThe pump light of (2) first generates stimulated raman scattering in the raman/brillouin crystal 7 after entering the brillouin resonator, and emits the pump light with the frequency omegaRWith the increase of the power of the pump light, the intracavity frequency is omegaRThe power density of the Raman light is increased, and when the stimulated Brillouin scattering threshold is reached, the Raman light in the cavity generates a frequency which is equal to the frequency omega of the acoustic wave fieldΩTo generate a first order stimulated brillouin scattering with an emission frequency of omegaS1The pump power is further increased to generate cascade stimulated Brillouin scattering to emit second order omegaS2Third order omegaS3Up to n order omegaSnThe Stokes light can generate first order omega under the action of four-wave mixingAS1Second order omegaAS2Up to m order omegaASmAnd m is less than or equal to n.
Wherein the Stokes light frequency omegaSFrequency omega of anti-Stokes lightASFrequency omega of Raman lightRAnd acoustic wave field frequency omegaΩThe frequency relationship between the two satisfies: omegaS＝ωR-ωΩAnd ωAS＝ωR+ωΩ(ii) a Frequencies between n-order Stokes lights and frequencies between m-order anti-Stokes lights satisfy ω respectivelyS(n)＝ωS(n-1)-ωΩAnd ωAS(m)＝ωAS(m-1)+ωΩ。
The frequency relationship satisfied above is, among other things, a characteristic of the device itself, determined by the chosen pump wavelength, and is well known to those skilled in the art.
Wherein the long-pass filter 9 is used for filtering out the residual pump light which is not absorbed and can pass through the filter with the cut-off frequency of the pump light frequency (omega)p) So that the frequency is lower than omegapThe generated brillouin laser and the frequency comb thereof can be output.
The frequency-locking controller 11 controls the piezoelectric ceramic displacement platform 10, so that the physical length L of the oscillator composed of the first concave reflector 6, the Raman/Brillouin crystal 7 and the second concave reflector 8 is equal to the positive integral multiple of 2 pi c/omegaΩThe length of the Raman/Brillouin resonant cavity is finely adjusted, so that stimulated Brillouin scattering is effectively excited by Raman light, and Brillouin laser and frequency comb generation are realized. The above c is the speed of light in vacuum.
The frequency-locking controller 11 controls the moving part of the piezoelectric ceramic displacement platform 1 only by using the physical characteristics of the device itself and setting the threshold value of the physical length L.
In specific implementation, the Raman/Brillouin crystal 7 adopts a diamond crystal with high Raman, high Brillouin gain coefficient and high thermal conductivity; the cutting angles at both ends of the Raman/Brillouin crystal 7 are flat-flat or Brewster angles, and both ends of the Raman/Brillouin crystal 7 are plated with a plating having a frequency of omegapThe pump light antireflection film.
When the cutting angles of the two end faces of the Raman/Brillouin crystal 7 are flat-flat, the included angle between the pump light and the incident face of the Raman/Brillouin crystal 7 is 0 degree; when both end faces of the raman/brillouin crystal 7 are cut at the brewster angle, the angle between the pump light and the incident face of the raman/brillouin crystal 7 is equal to the brewster angle.
The embodiment of the utility model provides a except that doing special explanation to the model of each device, the restriction is not done to the model of other devices, as long as can accomplish the device of above-mentioned function all can.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the embodiments of the present invention are given the same reference numerals and are not intended to represent the merits of the embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. An optical frequency comb, comprising:
the pump source emits a frequency of omegapThe pumping light sequentially passes through the optical isolator, the sampling lens, the first one-half wave plate and the focusing lens and then enters an oscillator consisting of a first concave reflector, a Raman/Brillouin crystal and a second concave reflector;
the second concave reflector is arranged on the piezoelectric ceramic displacement platform, backward reflected Raman light enters the frequency locking controller after being reflected by the sampling lens, and the frequency locking controller controls the displacement of the piezoelectric ceramic displacement platform.
2. An optical frequency comb according to claim 1, wherein the pump light is linearly polarized light.
3. An optical frequency comb according to claim 1, wherein said optical isolator is comprised of a second half-wave plate, a first polarizer, a faraday rotator, a third half-wave plate, and a second polarizer;
the sampling lens is composed of a plane optical glass and reflects part of pumping light and Raman light.
4. An optical frequency comb in accordance with claim 1, wherein the first concave mirror is a plano-concave mirror with a surface plating pair frequency ωpThe pumping light anti-reflection dielectric film and the frequency of the pumping light anti-reflection dielectric film are omegaRThe dielectric film of (3) which highly reflects Raman light.
5. An optical frequency comb in accordance with claim 1, wherein the second concave mirror is a plano-concave mirror with a surface plating pair frequency ωpThe pumping light is highly reflected dielectric film and the frequency is omegaRIs partially transmissive to the raman light.
6. An optical frequency comb according to claim 1, wherein the frequency-locking controller comprises an attenuator, a quarter-wave plate, a polarization splitting prism, a first photodetector, a second photodetector and a subtractor.
7. An optical frequency comb in accordance with claim 1, further comprising: a long-pass filter for filtering out omegapThe pump light of (1).
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| CN202020678830.0U CN211700924U (en) | 2020-04-28 | 2020-04-28 | Optical frequency comb |
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| CN202020678830.0U CN211700924U (en) | 2020-04-28 | 2020-04-28 | Optical frequency comb |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113178773A (en) * | 2021-04-16 | 2021-07-27 | 山西大学 | Method for dynamically controlling feedback phase in optical feedback lock cavity technology |
| CN114122875A (en) * | 2021-11-25 | 2022-03-01 | 河北工业大学 | Space operation Brillouin laser based on waveguide-shaped gain medium |
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2020
- 2020-04-28 CN CN202020678830.0U patent/CN211700924U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113178773A (en) * | 2021-04-16 | 2021-07-27 | 山西大学 | Method for dynamically controlling feedback phase in optical feedback lock cavity technology |
| CN113178773B (en) * | 2021-04-16 | 2024-05-24 | 山西大学 | Method for dynamically controlling feedback phase in optical feedback locking cavity technology |
| CN114122875A (en) * | 2021-11-25 | 2022-03-01 | 河北工业大学 | Space operation Brillouin laser based on waveguide-shaped gain medium |
| CN114122875B (en) * | 2021-11-25 | 2023-08-08 | 河北工业大学 | Space operation Brillouin laser based on waveguide-shaped gain medium |
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