CN113839296B - Wavelength locking LD resonance pumping picosecond amplifier - Google Patents
Wavelength locking LD resonance pumping picosecond amplifier Download PDFInfo
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- CN113839296B CN113839296B CN202110947855.5A CN202110947855A CN113839296B CN 113839296 B CN113839296 B CN 113839296B CN 202110947855 A CN202110947855 A CN 202110947855A CN 113839296 B CN113839296 B CN 113839296B
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- 238000005086 pumping Methods 0.000 title claims abstract description 41
- 230000010287 polarization Effects 0.000 claims abstract description 97
- 239000013307 optical fiber Substances 0.000 claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 229910009372 YVO4 Inorganic materials 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 230000003321 amplification Effects 0.000 abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000004069 differentiation Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
- H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/1001—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the optical pumping
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Abstract
The embodiment of the application belongs to the technical field of solid picosecond lasers and relates to a wavelength locking LD resonance pumping picosecond amplifier, which comprises a pumping source of the wavelength locking LD, wherein the pumping source is sequentially provided with a matched optical fiber, a collimating mirror, a first half wave plate, a focusing mirror, a dichroic mirror, a gain medium, a second half wave plate, a first polarization beam splitter prism, a Faraday rotator, a second polarization beam splitter prism and a seed source along the same optical axis in the light output direction. By controlling the polarization direction of the pumping light of the pumping source of the wavelength locking LD, the long axis of elliptical polarized light output by the pumping source corresponds to the maximum absorption direction of crystals in the gain medium, and the pumping efficiency of the seed light to the gain medium is maximum at the moment, so that the amplification power is effectively improved, the power differentiation generated by the picosecond amplifier is eliminated, and good consistency of each key optical parameter can be achieved under the condition of ensuring consistent mass production parameters of the picosecond amplifier.
Description
Technical Field
The application relates to the technical field of solid picosecond lasers, in particular to a wavelength locking LD resonance pumping picosecond amplifier.
Background
The wavelength locking LD resonance pumping multi-pass amplifying fiber seed source is the main scheme adopted by most industrial picosecond laser amplifying systems at present. The optical fibers coupled and output by the wavelength locking LD are mainly divided into Step optical fibers (Step Index) and Graded Index optical fibers (Graded Index) according to different refractive Index distribution, the LD adopting the two optical fibers is characterized in that the light intensity distribution of the coupled and output pumping light is greatly different near the beam waist after passing through a collimation focusing system, the Step optical fiber tends to be flat-topped, and the Graded Index optical fibers are Gaussian. The LD adopting the step optical fiber has the advantages that the light spot intensity distribution after focusing is smooth, the thermal focal length effect of the gain medium is reduced, the price is low, but the light intensity distribution of the light beam section is relatively poor, and the light beam section is easily influenced by the coiling of the optical fiber. The LD adopting graded index optical fiber has light intensity distribution not affected by the coiling of the optical fiber, but the Gaussian distribution light intensity can cause larger thermal lens effect of the gain medium, which is unfavorable for obtaining gain of seed light with high efficiency and has higher cost. Most of the current wavelength locking LDs adopt step fiber coupling output.
In the mass production process of the picosecond amplifier, the seed light parameter is consistent with the LD parameter, the coiling curvature radius of the LD coupling optical fiber is also the same, and in the debugging process, the large difference of the output power of the laser amplifier is always found, and the maximum power difference exceeds 50%. For a laser amplifier with obviously low output power, all parameters are kept unchanged, and when an optical fiber part coiled by an LD is placed vertically, the power is obviously improved by more than 40% -50%. When the coiled fiber is laid flat, the power is restored to the original power level. In order to ensure that the power of the laser amplifier reaches the standard, simply increasing the power of the amplifying stage often leads to the change of the divergence angle, the facula and the roundness of the laser, and the consistency of mass production parameters cannot be achieved.
Disclosure of Invention
The invention aims to provide a wavelength locking LD resonance pumping picosecond amplifier, which can eliminate the power difference generated by the picosecond amplifier and ensure that all key optical parameters can achieve good consistency under the condition of consistent mass production parameters of the picosecond amplifier.
In order to solve the above-mentioned problems, the embodiment of the present invention provides the following technical solutions:
the wavelength locking LD resonance pumping picosecond amplifier comprises a pumping source of the wavelength locking LD, wherein the pumping source is sequentially provided with a matched optical fiber, a collimating lens, a first half-wave plate, a focusing lens, a dichroic mirror, a gain medium, a second half-wave plate, a first polarization beam splitter prism, a Faraday rotator, a second polarization beam splitter prism and a seed source along the same optical axis in the light output direction;
the pump source is used for emitting pump light, and is conveyed to the gain medium through the matched optical fiber, the collimating lens, the first half-wave plate, the focusing lens and the dichroic mirror, and the seed source is used for emitting seed light, and is conveyed to the gain medium through the second polarization beam splitter prism, the Faraday rotator, the first polarization beam splitter prism and the second half-wave plate;
the collimating mirror is used for collimating the pump light, the first half-wave plate is used for controlling the polarization direction of the pump light output by the collimating mirror, the focusing mirror is used for focusing the pump light output by the first half-wave plate, the gain medium is used for amplifying the seed light, and the dichroic mirror is used for transmitting the pump light output by the focusing mirror and reflecting the seed light output by the gain medium;
the second half-wave plate is used for controlling the polarization direction of seed light, the Faraday rotator is used for rotating the polarization state of the seed light, the first polarization splitting prism is used for transmitting the seed light output by the Faraday rotator and the seed light output by the second half-wave plate, and the second polarization splitting prism is used for transmitting the seed light output by the seed source and reflecting the seed light output by the Faraday rotator.
Further, a third half wave plate, an optical fiber collimator and a pulse selector are sequentially arranged between the second polarization splitting prism and the seed source along the same optical axis;
the third half-wave plate is used for controlling the polarization direction of the seed light, the optical fiber collimator is used for collimating the seed light, and the pulse selector is used for adjusting the seed light.
Further, the light-transmitting surface of the first half-wave plate is plated with an antireflection film of 878.6 nm.
Further, the collimating mirror and the focusing mirror are both plated with an antireflection film of 878.6nm, and the imaging ratio of the focusing mirror is 1:2.
further, the dichroic mirror used was coated with an antireflection film of 878.6nm and a high reflection film of 1064 nm.
Further, the gain medium is Nd: YVO4, the gain medium is coated with an antireflection film of 878.6nm and an antireflection film of 1064 nm.
Further, the second half wave plate, the first polarization beam splitter prism, the Faraday rotator, the second polarization beam splitter prism and the third half wave plate are all plated with an antireflection film of 1064 nm.
Further, the wavelength of the pump source is 878.6nm, the fiber parameter is 400um, and the power is 65W.
Further, the wavelength of the seed source is 1064nm, the frequency is 20MHz, and the power is 50mW.
Compared with the prior art, the embodiment of the invention has the following main beneficial effects:
the wavelength locking LD resonates and pumps the picosecond amplifier, the pumping source of the wavelength locking LD emits the pumping light, the pumping light enters the gain medium after passing through the matched optical fiber, the collimating mirror, the first half wave plate, the focusing mirror and the dichroic mirror in turn, the collimating mirror collimates the pumping light, the first half wave plate controls the polarization direction of the pumping light output by the collimating mirror, the focusing mirror focuses the pumping light output by the first half wave plate, and then the pumping light excites the gain medium to amplify the seed light; the method is characterized in that a first half wave plate is arranged on an optical axis between a collimating mirror and a focusing mirror based on the defect of large difference of polarization directions of pump light output by a pump source of a wavelength locking LD, the polarization directions of the pump light are controlled by rotating the first half wave plate, so that the long axis of elliptical polarized light output by the pump source corresponds to the maximum absorption direction of crystals in a gain medium, and the pumping efficiency of the seed light to the gain medium is maximum at the moment, thereby effectively improving the amplification power. By controlling the polarization direction of the pump light of the pump source, the absorption of the pump light with different polarization directions and the gain medium achieves the optimal effect, so that the power difference generated by the picosecond amplifier is eliminated, and good consistency of all key optical parameters (power, light spots, divergence angle and roundness) can be achieved under the condition that the mass production parameters of the picosecond amplifier are consistent.
Drawings
In order to more clearly illustrate the solution of the present invention, a brief description will be given below of the drawings required for the description of the embodiments, it being apparent that the drawings in the following description are some embodiments of the present invention and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a wavelength locked LD resonant pumped picosecond amplifier according to an embodiment of the present invention.
Reference numerals illustrate:
001. a pump source; 002. a mating optical fiber; 003. a collimator lens; 004. a first half-wave plate; 005. a focusing mirror; 006. a dichroic mirror; 007. a gain medium; 008. a second half-wave plate; 009. a first polarization splitting prism; 010. a Faraday rotator; 011. a second polarization splitting prism; 012. a third half-wave plate; 013. an optical fiber collimator; 014. a pulse selector; 015. seed source.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having" and any variations thereof in the description of the invention and the claims and the foregoing description of the drawings are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In order to enable those skilled in the art to better understand the present invention, a technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Examples
As shown in fig. 1, the wavelength-locked LD resonance pumping picosecond amplifier comprises a pumping source 001 of the wavelength-locked LD, wherein the pumping source 001 is sequentially provided with a matched optical fiber 002, a collimating mirror 003, a first half-wave plate 004, a focusing mirror 005, a dichroic mirror 006, a gain medium 007, a second half-wave plate 008, a first polarization splitting prism 009, a faraday rotator 010, a second polarization splitting prism 011 and a seed source 015 along the optical output direction with the optical axis, the pumping source 001 is used for emitting pumping light, the pumping source 001 is transmitted to the gain medium 007 through the matched optical fiber 002, the collimating mirror 003, the first half-wave plate 004, the focusing mirror 005 and the dichroic mirror 006, the seed source 015 is used for emitting seed light, the collimating mirror 003 is used for collimating the pumping light, the first half-wave plate 004 is used for controlling the polarization direction of the pumping light output by the collimating mirror 003, the focusing mirror 005 is used for focusing the pumping light output by the first half-wave plate 004, the seed light 007 is transmitted by the dichroic mirror 005 is used for amplifying the gain medium 007; the second half-wave plate 008 is used for controlling the polarization direction of the seed light, the faraday rotator 010 is used for rotating the polarization state of the seed light, the first polarization splitting prism 009 is used for transmitting the seed light output by the faraday rotator 010 and the seed light output by the second half-wave plate 008, and the second polarization splitting prism 011 is used for transmitting the seed light output by the seed source 015 and reflecting the seed light output by the faraday rotator 010.
According to the wavelength locking LD resonance pumping picosecond amplifier provided by the embodiment of the invention, picosecond pulse seed light is output from a seed source 015, the seed light sequentially passes through a second polarization splitting prism 011, an optical Faraday rotator 010, a first polarization splitting prism 009 and a second half-wave plate 008, the second polarization splitting prism 011 transmits the seed light output by the seed source 015, the optical Faraday rotator 010 rotates the polarization state of the seed light, the first polarization splitting prism 009 transmits the seed light output by the optical Faraday rotator 010, the second half-wave plate 008 controls the polarization direction of the seed light, and then the seed light enters a gain medium 007 for amplification; the method comprises the steps that a pump source 001 of a wavelength locking LD emits pump light, the pump light sequentially passes through a matched optical fiber 002, a collimating lens 003, a first half-wave plate 004, a focusing lens 005 and a dichroic mirror 006 and then enters a gain medium 007, the collimating lens 003 collimates the pump light, the first half-wave plate 004 controls the polarization direction of the pump light output by the collimating lens 003, the focusing lens 005 focuses the pump light output by the first half-wave plate 004, and then the pump light excites the gain medium 007 to amplify seed light; the amplified seed light is reflected by the dichroic mirror 006 and then secondarily amplified by the gain medium 007, and returns along the original optical path, that is, the seed light sequentially passes through the second half-wave plate 008, the first polarization splitting prism 009 and the faraday rotator 010 from the gain medium 007, and finally amplified laser is output by the second polarization splitting prism 011, specifically, the second half-wave plate 008 controls the polarization direction of the seed light, the first polarization splitting prism 009 transmits the seed light output by the second half-wave plate 008, the faraday rotator 010 rotates the polarization state of the seed light, and the second polarization splitting prism 011 reflects the seed light output by the faraday rotator 010, thereby outputting the finally amplified laser.
The wavelength locking LD adopting the step optical fiber is researched, and the fact that after the optical fiber is coiled, the polarization state of the output pumping light is changed except for the change of the intensity distribution of the output light spot, the polarized light is changed into elliptical polarized light, and the disturbance on the optical fiber can change the polarization state distribution of the optical fiber. When the LD is produced and assembled, the polarization direction and the polarization ratio of the pump light output by the LD after coiling the optical fiber can not be determined, so that the power difference exists during the mass production of the picosecond amplifier. The invention is based on the defect of larger difference of polarization directions of pump light output by a pump source 001 of a wavelength locking LD, a first half wave plate 004 is arranged on an optical axis between a collimating mirror 003 and a focusing mirror 005, and the polarization direction of the pump light is controlled by rotating the first half wave plate 004, so that the long axis of elliptical polarized light output by the pump source 001 corresponds to the maximum absorption direction of crystals in a gain medium 007, and at the moment, the pumping efficiency of seed light to the gain medium 007 is maximum, thereby effectively improving the amplifying power. By controlling the polarization direction of the pump light of the pump source 001, the absorption of the pump light with different polarization directions and the gain medium 007 can achieve the best effect, thereby eliminating the power differentiation generated by the picosecond amplifier and ensuring that all the key optical parameters (power, light spot, divergence angle and roundness) can achieve good consistency under the condition of ensuring the consistent mass production parameters of the picosecond amplifier.
A third half-wave plate 012, an optical fiber collimator 013 and a pulse selector 014 are sequentially arranged between the second polarization splitting prism 011 and the seed source 015 along the same optical axis, the third half-wave plate 012 is used for controlling the polarization direction of seed light, the optical fiber collimator 013 is used for collimating the seed light, and the pulse selector 014 is used for adjusting the seed light.
Picosecond pulse seed light is output from a seed source 015, the seed light sequentially passes through a third half-wave plate 012, an optical fiber collimator 013 and a pulse selector 014, the third half-wave plate 012 controls the polarization direction of the seed light, the optical fiber collimator 013 collimates the seed light, the pulse selector 014 is used for adjusting the seed light, the seed light with the working frequency of tens of MHz is changed into modulated seed light within 1MHz, and then the modulated seed light is output to a second polarization splitting prism 011, the second polarization splitting prism 011 transmits the seed light output by the seed source 015, the optical Faraday rotator 010 rotates the polarization state of the seed light, the first polarization splitting prism 009 transmits the seed light output by the optical Faraday rotator 010, the second half-wave plate 008 controls the polarization direction of the seed light, and then the seed light enters a gain medium 007 for amplification; the amplified seed light is reflected by the dichroic mirror 006 and then secondarily amplified by the gain medium 007, and returns along the original optical path, that is, the seed light sequentially passes through the second half-wave plate 008, the first polarization splitting prism 009 and the faraday rotator 010 from the gain medium 007, and finally amplified laser is output by the second polarization splitting prism 011, specifically, the second half-wave plate 008 controls the polarization direction of the seed light, the first polarization splitting prism 009 transmits the seed light output by the second half-wave plate 008, the faraday rotator 010 rotates the polarization state of the seed light, and the second polarization splitting prism 011 reflects the seed light output by the faraday rotator 010, thereby outputting the finally amplified laser.
In the embodiment of the invention, the light-transmitting surface of the first half-wave plate 004 is plated with an antireflection film of 878.6 nm.
In the embodiment of the present invention, the collimating lens 003 and the focusing lens 005 are both coated with an antireflection film of 878.6nm, and the imaging ratio of the focusing lens 005 is 1:2.
in the present embodiment, the dichroic mirror 006 used was coated with an antireflection film of 878.6nm and a highly reflective film of 1064 nm.
In the embodiment of the present invention, the gain medium 007 is Nd: YVO4, the gain medium 007 being coated with an antireflection film of 878.6nm and an antireflection film of 1064 nm.
In the embodiment of the invention, the second half-wave plate 008, the first polarization beam splitter prism 009, the faraday rotator 010, the second polarization beam splitter prism 011 and the third half-wave plate 012 are all coated with an antireflection film of 1064 nm.
In the embodiment of the invention, the wavelength of the pump source 001 is 878.6nm, the optical fiber parameter is 400um, and the power is 65W.
In the embodiment of the invention, the wavelength of the seed source 015 is 1064nm, the frequency is 20MHz, and the power is 50mW.
The working process comprises the following steps: picosecond pulse seed light is output from a seed source 015, the seed light sequentially passes through a third half-wave plate 012, an optical fiber collimator 013 and a pulse selector 014, the third half-wave plate 012 controls the polarization direction of the seed light, the optical fiber collimator 013 collimates the seed light, the pulse selector 014 is used for adjusting the seed light, the seed light with the working frequency of tens of MHz is changed into modulated seed light within 1MHz, and then the modulated seed light is output to a second polarization splitting prism 011, the second polarization splitting prism 011 transmits the seed light output by the seed source 015, the optical Faraday rotator 010 rotates the polarization state of the seed light, the first polarization splitting prism 009 transmits the seed light output by the optical Faraday rotator 010, the second half-wave plate 008 controls the polarization direction of the seed light, and then the seed light enters a gain medium 007 for amplification;
the method comprises the steps that a pump source 001 of a wavelength locking LD emits pump light, the pump light sequentially passes through a matched optical fiber 002, a collimating lens 003, a first half-wave plate 004, a focusing lens 005 and a dichroic mirror 006 and then enters a gain medium 007, the collimating lens 003 collimates the pump light, the first half-wave plate 004 controls the polarization direction of the pump light output by the collimating lens 003, the focusing lens 005 focuses the pump light output by the first half-wave plate 004, and then the pump light excites the gain medium 007 to amplify seed light;
the amplified seed light is reflected by the dichroic mirror 006 and then secondarily amplified by the gain medium 007, and returns along the original optical path, that is, the seed light sequentially passes through the second half-wave plate 008, the first polarization splitting prism 009 and the faraday rotator 010 from the gain medium 007, and finally amplified laser is output by the second polarization splitting prism 011, specifically, the second half-wave plate 008 controls the polarization direction of the seed light, the first polarization splitting prism 009 transmits the seed light output by the second half-wave plate 008, the faraday rotator 010 rotates the polarization state of the seed light, and the second polarization splitting prism 011 reflects the seed light output by the faraday rotator 010, thereby outputting the finally amplified laser. The invention is based on the defect of larger difference of polarization directions of pump light output by a pump source 001 of a wavelength locking LD, a first half wave plate 004 is arranged on an optical axis between a collimating mirror 003 and a focusing mirror 005, and the polarization direction of the pump light is controlled by rotating the first half wave plate 004, so that the long axis of elliptical polarized light output by the pump source 001 corresponds to the maximum absorption direction of crystals in a gain medium 007, and at the moment, the pumping efficiency of seed light to the gain medium 007 is maximum, thereby effectively improving the amplifying power. By controlling the polarization direction of the pump light of the pump source 001 of the wavelength locking LD, the absorption of the pump light with different polarization directions and the gain medium 007 can achieve the best effect, thereby eliminating the power differentiation generated by the picosecond amplifier and ensuring that all the key optical parameters (power, light spot, divergence angle and roundness) can achieve good consistency under the condition of consistent mass production parameters of the picosecond amplifier.
It is apparent that the above-described embodiments are only some embodiments of the present invention, but not all embodiments, and the preferred embodiments of the present invention are shown in the drawings, which do not limit the scope of the patent claims. This invention may be embodied in many different forms, but rather, embodiments are provided in order to provide a thorough and complete understanding of the present disclosure. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing description, or equivalents may be substituted for elements thereof. All equivalent structures made by the content of the specification and the drawings of the invention are directly or indirectly applied to other related technical fields, and are also within the scope of the invention.
Claims (8)
1. A wavelength locked LD resonance pumping picosecond amplifier is characterized in that,
the device comprises a pumping source of a wavelength locking LD, wherein the pumping source of the wavelength locking LD adopts a step optical fiber, and the pumping source is sequentially provided with a matched optical fiber, a collimating lens, a first half-wave plate, a focusing lens, a dichroic mirror, a gain medium, a second half-wave plate, a first polarization beam splitter prism, a Faraday rotator, a second polarization beam splitter prism and a seed source along the same optical axis in the light output direction; the matched optical fiber is coiled optical fiber;
the pump source is used for emitting pump light, and is conveyed to the gain medium through the matched optical fiber, the collimating lens, the first half-wave plate, the focusing lens and the dichroic mirror, and the seed source is used for emitting seed light, and is conveyed to the gain medium through the second polarization beam splitter prism, the Faraday rotator, the first polarization beam splitter prism and the second half-wave plate;
the collimating mirror is used for collimating the pump light, the first half-wave plate is used for controlling the polarization direction of the pump light output by the collimating mirror, the focusing mirror is used for focusing the pump light output by the first half-wave plate, the gain medium is used for amplifying the seed light, and the dichroic mirror is used for transmitting the pump light output by the focusing mirror and reflecting the seed light output by the gain medium;
the second half-wave plate is used for controlling the polarization direction of seed light, the Faraday rotator is used for rotating the polarization state of the seed light, the first polarization splitting prism is used for transmitting the seed light output by the Faraday rotator and the seed light output by the second half-wave plate, and the second polarization splitting prism is used for transmitting the seed light output by the seed source and reflecting the seed light output by the Faraday rotator; a third half-wave plate, an optical fiber collimator and a pulse selector are sequentially arranged between the second polarization beam splitter prism and the seed source along the same optical axis;
the third half-wave plate is used for controlling the polarization direction of the seed light, the optical fiber collimator is used for collimating the seed light, and the pulse selector is used for adjusting the seed light.
2. The wavelength locked LD resonant pumped picosecond amplifier of claim 1, wherein,
the light-transmitting surface of the first half-wave plate is plated with an antireflection film of 878.6 nm.
3. The wavelength locked LD resonant pumped picosecond amplifier of claim 1, wherein,
the collimating mirror and the focusing mirror are both plated with an antireflection film of 878.6nm, and the imaging ratio of the focusing mirror is 1:2.
4. The wavelength locked LD resonant pumped picosecond amplifier of claim 1, wherein,
the dichroic mirror used was coated with an antireflection film of 878.6nm and a high reflection film of 1064 nm.
5. The wavelength locked LD resonant pumped picosecond amplifier of claim 1, wherein,
the gain medium is Nd: YVO4, and is plated with an antireflection film of 878.6nm and an antireflection film of 1064 nm.
6. The wavelength locked LD resonant pumped picosecond amplifier of claim 1, wherein,
the second half wave plate, the first polarization beam splitter prism, the Faraday rotator, the second polarization beam splitter prism and the third half wave plate are all plated with an antireflection film of 1064 nm.
7. The wavelength locked LD resonant pumped picosecond amplifier of claim 1, wherein,
the wavelength of the pump source is 878.6nm, the optical fiber parameter is 400um, and the power is 65W.
8. The wavelength locked LD resonant pumped picosecond amplifier of claim 1, wherein,
the wavelength of the seed source is 1064nm, the frequency is 20MHz, and the power is 50mW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110947855.5A CN113839296B (en) | 2021-08-18 | 2021-08-18 | Wavelength locking LD resonance pumping picosecond amplifier |
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| CN108988117A (en) * | 2018-07-25 | 2018-12-11 | 长春理工大学 | A kind of laser amplifier based on polarized combination laser gain |
| CN112563876A (en) * | 2020-12-07 | 2021-03-26 | 中山大学 | High-efficiency rod-shaped laser amplifier and working method thereof |
| CN113009631A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Multifunctional optical isolator, amplifier, laser and debugging method |
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| CN102064459A (en) * | 2010-11-26 | 2011-05-18 | 中国电子科技集团公司第十一研究所 | Pump device with crystals having linear polarization absorption characteristic |
| CN108039639A (en) * | 2017-12-05 | 2018-05-15 | 中国科学院西安光学精密机械研究所 | The how logical ultra-short pulse laser amplifier of based single crystal optical fiber polarisation control |
| CN108923241A (en) * | 2018-07-25 | 2018-11-30 | 长春理工大学 | A kind of passive Q-regulaitng laser based on polarized combination laser gain |
| CN108988117A (en) * | 2018-07-25 | 2018-12-11 | 长春理工大学 | A kind of laser amplifier based on polarized combination laser gain |
| CN112563876A (en) * | 2020-12-07 | 2021-03-26 | 中山大学 | High-efficiency rod-shaped laser amplifier and working method thereof |
| CN113009631A (en) * | 2021-03-02 | 2021-06-22 | 杭州奥创光子技术有限公司 | Multifunctional optical isolator, amplifier, laser and debugging method |
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