CN114696184A - Feedback enhancement method of self-injection locking laser based on echo wall external cavity - Google Patents
Feedback enhancement method of self-injection locking laser based on echo wall external cavity Download PDFInfo
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- CN114696184A CN114696184A CN202210290935.2A CN202210290935A CN114696184A CN 114696184 A CN114696184 A CN 114696184A CN 202210290935 A CN202210290935 A CN 202210290935A CN 114696184 A CN114696184 A CN 114696184A
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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Abstract
The invention discloses a self-injection locking laser based on an echo wall external cavity, which comprises a focusing lens, a first prism, an echo wall resonant cavity and a second prism, wherein in the using stage of a user: the laser beam entering the first prism is provided by a DFB laser; in the debugging stage: the emergent laser of the debugging laser passes through the optical fiber circulator, the collimator and the focusing lens and then is used as a laser beam entering the first prism. The invention also discloses a feedback enhancement method of the self-injection locking laser based on the echo wall external cavity. The invention simplifies the reflection feedback, and simultaneously enhances the light intensity of the reinjection light so as to better lock the laser frequency at the resonance frequency of the echo wall resonant cavity and the line width of the narrowed laser; the second prism is insensitive to angle change, the anti-seismic performance is improved, and the wavelength selection range of the self-injection locking laser is expanded.
Description
Technical Field
The invention belongs to the technical field of narrow linewidth lasers, and particularly relates to a self-injection locking laser based on a echo wall external cavity, and a feedback enhancement method of the self-injection locking laser based on the echo wall external cavity.
Background
The laser line width is one of the core indexes of the laser, and the narrow line width laser is widely applied to various fields of atomic optical clocks, quantum information technology, high-resolution optical sensing, laser radars, coherent optical communication and the like. The existing optical fiber laser has narrow line width and good stability, but the working wavelength is very limited; the semiconductor laser has the advantages of small volume, low power consumption, wide wavelength range and the like, but is limited by the short cavity length, and the line width can only be about MHz mostly; the external cavity semiconductor laser has narrow line width but poor shock resistance. The self-injection locking technology takes a semiconductor laser as a light source, laser is fed back to a laser tube after external cavity filtering, mode competition is participated in the laser tube, spontaneous radiation of the laser tube is inhibited, and narrow linewidth laser output of the laser is finally realized.
Disclosure of Invention
The invention aims to provide a self-injection locking laser based on an echo wall external cavity and a feedback enhancing method of the self-injection locking laser based on the echo wall external cavity aiming at the technical problems in the existing feedback optical device, so as to increase the laser energy of feedback reinjection and enhance the stability of the laser after locking.
The above object of the present invention is achieved by the following technical means:
a self-injection locking laser based on echo wall external cavity comprises a focusing lens, a first prism, an echo wall resonant cavity and a second prism,
the laser beam enters the first prism through the focusing lens and then is totally reflected on the inner surface of the first prism to form an evanescent wave, a part of the laser beam entering the first prism is coupled into the echo wall resonant cavity through the evanescent wave, the laser coupled into the echo wall resonant cavity from the first prism circulates in the echo wall resonant cavity in a whispering gallery mode in the clockwise direction, and the laser circulating in the anticlockwise direction in the echo wall resonant cavity is coupled out of the echo wall resonant cavity from the first prism to be used as feedback light,
the laser in the echo wall resonant cavity along the counterclockwise direction is coupled into the second prism as injected light, the spherical surface of the second prism is plated with a high reflective film, the high reflective film reflects a part of the injected light back to the echo wall resonant cavity as reinjection light, and the reinjection light circulates in the echo wall resonant cavity along the counterclockwise direction so as to increase the energy of the laser circulating in the echo wall resonant cavity along the counterclockwise direction.
In the user use stage: the laser beam entering the first prism is provided by a DFB laser;
in the debugging stage: the emergent laser of the debugging laser is used as a laser beam entering the first prism after passing through the optical fiber circulator, the collimator and the focusing lens, and the feedback light is detected by the power meter PD after sequentially passing through the focusing lens, the collimator and the optical fiber circulator.
As described above, the second prism is hemispherical, and the center of sphere of the second prism is located at the coupling point of the echo wall resonant cavity or close to the coupling point.
The refractive index of the first prism and the second prism is higher than that of the echo wall cavity as described above.
The focusing lens couples the spot size of the laser beam to match the gaussian window of the echo wall cavity as described above.
A feedback enhancement method of a self-injection locking laser based on an echo wall external cavity comprises the following steps:
step 2, operating a debugging laser to generate a laser beam;
step 3, adjusting the angle and the spatial position of the laser beam generated by the debugging laser, operating the distance between the first prism and the echo wall resonant cavity, coupling one part of the laser beam generated by the debugging laser into the echo wall resonant cavity, and circulating in the echo wall resonant cavity along the clockwise direction;
and readjusting the angle and the spatial position of the laser beam generated by the DFB laser, so that one part of the laser beam generated by the DFB laser is coupled into the echo wall resonant cavity, coupling the reinjection light into the first prism, and feeding back the reinjection light to the DFB laser as feedback light to realize self-injection locking of the DFB laser, wherein the laser frequency is locked on the resonant frequency of the echo wall resonant cavity.
Compared with the prior art, the invention has the following beneficial effects:
by adopting the technical scheme, the light intensity of the reinjection light is enhanced while the reflection feedback is simplified, so that the frequency of the laser is better locked at the resonant frequency of the echo wall resonant cavity and the line width of the narrowed laser; the second prism is in a hemispherical shape and is insensitive to angle change, and the position matching of the hemispherical center and the coupling point of the echo wall resonant cavity is only required to be found in the assembling and adjusting process, so that the assembling and adjusting difficulty of the system is greatly simplified; the second prism is in a hemispherical shape and is insensitive to angle change, so that the anti-seismic performance of the laser device can be improved; the second prism is in a hemispherical shape, has the same feedback effect on different working modes of the echo wall resonant cavity, and expands the wavelength selection range of the self-injection locking laser.
Drawings
FIG. 1 is a schematic diagram of the present invention in a debugging stage.
Fig. 2 is a schematic structural diagram of the present invention at the user using stage.
Fig. 3 is a schematic view of the geometry of the second prism.
In the figure: 1-a power meter; 2-debugging the laser; 3-a fiber optic circulator; 4-a collimator; 5-a focusing lens; 6-a first prism; 7-whispering gallery resonator cavity; 8-a second prism; 9-high reflection film; 10-DFB laser.
Detailed Description
The present invention will be described in further detail with reference to embodiments for facilitating understanding and implementation of the present invention by those of ordinary skill in the art, and it should be understood that the embodiments described herein are merely illustrative and explanatory of the present invention and are not restrictive thereof.
Example 1:
a whispering gallery external cavity based self-injection locked laser comprising:
and debugging the laser to generate laser beam, and coupling the laser beam out by the optical fiber for debugging. And the DFB laser generates laser beams which are finally output to users for use.
In the user use stage:
the laser beam entering the first prism is provided by a DFB laser.
The first prism is positioned in the light path of the laser beam, the laser beam generated by the DFB laser enters the first prism through the focusing lens and then is totally reflected on the inner surface of the first prism to form an evanescent wave, and the position and the angle of the laser beam are adjusted to enable the phase of the evanescent wave to be matched with the phase of the echo wall resonant cavity, wherein the specific formula is as follows:
in the formula (1), the first and second groups,
the refractive index n of the material selected for the first prism is such that the coupling angle of the laser beam, beta is the propagation constant of the whispering gallery resonator, k is the wavevector of the laser, and equation (1) holdspA refractive index n higher than the material chosen for the whispering gallery cavity is required. After the phase matching condition is met, at least one part of the laser beam entering the first prism is coupled into the echo wall resonant cavity through the evanescent wave, the laser coupled into the echo wall resonant cavity from the first prism circulates in the echo wall resonant cavity in the clockwise direction in the echo wall mode, the laser circulating in the anti-clockwise direction in the echo wall resonant cavity is coupled out of the echo wall resonant cavity from the first prism to serve as feedback light, the feedback light returns to the DFB laser, and the line width of the DFB laser is narrowed.
The position of the coupling between the second prism and the echo wall resonant cavity is different from the position of the coupling between the first prism and the echo wall resonant cavity, and laser in the counterclockwise direction in the echo wall resonant cavity is coupled into the second prism to be used as injected light; the spherical surface of the second prism is plated with a high reflection film for reflecting at least one part of the injected light back to the echo wall resonant cavity as the injected light; the feedback light circulates along the anticlockwise direction in the echo wall resonant cavity to increase the energy of the laser circulating along the anticlockwise direction in the echo wall resonant cavity, so that the laser energy of the feedback light fed back to the DFB laser through the first prism is enhanced, and the frequency of the DFB laser is locked at the resonant frequency of the echo wall resonant cavity and the line width of the narrowed laser. The refractive index of the material selected for the second prism is required to be higher than the refractive index of the material selected for the whispering gallery cavity.
The second prism is in a hemispherical shape, and the spherical center of the second prism is positioned at the coupling point of the echo wall resonant cavity or close to the coupling point.
And the spherical surface of the second prism is plated with a high reflection film, and at least one part of the injected light is reflected back to the echo wall resonant cavity to be used as the injected light.
Fig. 3 is a geometric diagram of the second prism, which is a hemisphere, the top and two symmetrical sides of the hemisphere are cut into planes to facilitate the fixing of the second prism, and the spherical surface of the second prism is coated with a high reflective film. The sphere center of the second prism is near the coupling point or the coupling point, and the second prism is insensitive to the laser angle, the divergence angle and the like coupled out by the echo wall resonant cavity.
In the debugging stage:
the emergent laser of the debugging laser passes through the optical fiber circulator, the collimator and the focusing lens and then is used as a laser beam entering the first prism.
The feedback light passes through the focusing lens, the collimator and the optical fiber circulator in sequence and then is detected by the power meter PD.
The first prism, the echo wall resonant cavity and the second prism work in the same way as in the user use stage.
Example 2:
a feedback enhancement method for a whispering gallery external cavity-based self-injection locked laser, which uses the whispering gallery external cavity-based self-injection locked laser described in embodiment 1, includes the following steps:
step 2, operating a debugging laser to generate a laser beam;
step 3, adjusting the angle and the spatial position of the laser beam generated by the debugging laser, operating the distance between the first prism and the echo wall resonant cavity, coupling one part of the laser beam generated by the debugging laser into the echo wall resonant cavity, and circulating in the echo wall resonant cavity along the clockwise direction;
and readjusting the angle and the spatial position of the laser beam generated by the DFB laser, so that a part of the laser beam generated by the DFB laser is coupled into the echo wall resonant cavity, and at the moment, the first prism and the second prism are well adjusted, and the reinjection light is coupled into the first prism and fed back to the DFB laser as feedback light to realize self-injection locking of the DFB laser, and the laser frequency is locked on the resonant frequency of the echo wall resonant cavity.
It should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. A self-injection locking laser based on echo wall external cavity comprises a focusing lens, and is characterized by also comprising a first prism, an echo wall resonant cavity and a second prism,
the laser beam enters the first prism through the focusing lens and then is totally reflected on the inner surface of the first prism to form an evanescent wave, a part of the laser beam entering the first prism is coupled into the echo wall resonant cavity through the evanescent wave, the laser coupled into the echo wall resonant cavity from the first prism circulates in the echo wall resonant cavity in a whispering gallery mode in the clockwise direction, and the laser circulating in the anticlockwise direction in the echo wall resonant cavity is coupled out of the echo wall resonant cavity from the first prism to be used as feedback light,
the laser in the echo wall resonant cavity along the counterclockwise direction is coupled into a second prism as injected light, the spherical surface of the second prism is plated with a high-reflection film, part of the injected light is reflected back to the echo wall resonant cavity by the high-reflection film to be used as reinjection light, and the reinjection light circulates in the echo wall resonant cavity along the counterclockwise direction so as to increase the energy of the laser circulating in the echo wall resonant cavity along the counterclockwise direction.
2. A self-injection locked laser based on an external echo wall cavity according to claim 1, characterized in that during the user phase: the laser beam entering the first prism is provided by a DFB laser;
in the debugging stage: the emergent laser of the debugging laser is used as a laser beam entering the first prism after passing through the optical fiber circulator, the collimator and the focusing lens, and the feedback light is detected by the power meter PD after sequentially passing through the focusing lens, the collimator and the optical fiber circulator.
3. The self-injection locked laser based on an echo wall external cavity as claimed in claim 2, wherein the second prism is of a hemispherical shape, and the center of sphere of the second prism is located at or near the coupling point of the echo wall cavity.
4. The whispering gallery external cavity based self-injection locked laser of claim 2 wherein the refractive index of said first and second prisms is higher than the refractive index of the whispering gallery cavity.
5. The self-injection locked laser based on an echo wall external cavity of claim 2 wherein the focusing lens couples the spot size of the laser beam to match the gaussian window of the echo wall cavity.
6. A feedback enhancement method for a whispering gallery external cavity based self-injection locked laser using the whispering gallery external cavity based self-injection locked laser as claimed in claim 2, comprising the steps of:
step 1, connecting a debugging laser with an input end of an optical fiber circulator, connecting a power device PD with an output end of the optical fiber circulator, connecting a collimator with an input-output multiplexing end of the optical fiber circulator, and arranging a focusing lens between the collimator and a first prism;
step 2, operating a debugging laser to generate a laser beam;
step 3, adjusting the angle and the spatial position of the laser beam generated by the debugging laser, operating the distance between the first prism and the echo wall resonant cavity, coupling one part of the laser beam generated by the debugging laser into the echo wall resonant cavity, and circulating in the echo wall resonant cavity along the clockwise direction;
step 4, adjusting the position of the second prism, and monitoring the voltage value of the power meter PD to enable the voltage value of the power meter PD to be the maximum value;
step 5, removing the debugging laser, the optical fiber circulator, the power meter PD and the collimator, and laying the DFB laser;
step 6, operating the DFB laser to generate laser beams;
and readjusting the angle and the spatial position of the laser beam generated by the DFB laser, so that one part of the laser beam generated by the DFB laser is coupled into the echo wall resonant cavity, coupling the reinjection light into the first prism, and feeding back the reinjection light to the DFB laser as feedback light to realize self-injection locking of the DFB laser, wherein the laser frequency is locked on the resonant frequency of the echo wall resonant cavity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115473122A (en) * | 2022-10-08 | 2022-12-13 | 北京大学长三角光电科学研究院 | External cavity type semiconductor laser |
| CN115498488A (en) * | 2022-09-22 | 2022-12-20 | 中国科学院精密测量科学与技术创新研究院 | Echo wall coupling module based on prism coupling and adjusting method thereof |
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| US20120294319A1 (en) * | 2011-05-16 | 2012-11-22 | Oewaves, Inc. | Generation of single optical tone, RF oscillation signal and optical comb in a triple-oscillator device based on nonlinear optical resonator |
| CN106058626A (en) * | 2007-06-13 | 2016-10-26 | Oe电波公司 | Tunable lasers locked to whispering gallery mode resonators |
| US20200313389A1 (en) * | 2019-03-27 | 2020-10-01 | Samsung Electronics Co., Ltd. | Laser device and method of transforming laser spectrum |
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| CN106058626A (en) * | 2007-06-13 | 2016-10-26 | Oe电波公司 | Tunable lasers locked to whispering gallery mode resonators |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115498488A (en) * | 2022-09-22 | 2022-12-20 | 中国科学院精密测量科学与技术创新研究院 | Echo wall coupling module based on prism coupling and adjusting method thereof |
| CN115473122A (en) * | 2022-10-08 | 2022-12-13 | 北京大学长三角光电科学研究院 | External cavity type semiconductor laser |
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