CN106469887B - Double-pass amplifier of photonic crystal fiber - Google Patents
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- 239000000835 fiber Substances 0.000 title claims abstract description 115
- 239000004038 photonic crystal Substances 0.000 title claims abstract description 109
- 230000003321 amplification Effects 0.000 claims abstract description 33
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 239000010409 thin film Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 description 12
- 238000005086 pumping Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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Abstract
The invention provides a bi-pass amplifier of photonic crystal fiber, which relates to the technical field of laser, wherein signal light sequentially passes through a half-wave plate (1), a polarizing plate (2), a first lens (3), a rod-shaped photonic crystal fiber (5) and a second lens (6), is reflected by a first dichroic mirror (9), passes through a quarter-wave plate or a 45-degree optical rotator (7), is reflected by a concave reflector (8), passes through the quarter-wave plate (7) again, is reflected by the first dichroic mirror (9), sequentially passes through the second lens (6), the rod-shaped photonic crystal fiber (5) and the first lens (3) to the polarizing plate (2), and is reflected and output; the pump light sequentially passes through the first dichroic mirror (9) and the second lens (6) and then enters the rod-shaped photonic crystal fiber (5); the invention fully utilizes the amplification capacity of the rod-shaped optical fiber, so that the signal light passes through the rod-shaped photonic crystal fiber twice, the effective amplification of high-energy ultrashort pulses is realized, and the amplification gain is high.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a bi-pass amplifier of a photonic crystal fiber, which realizes bi-pass amplification by using a rod-shaped photonic crystal fiber.
Background
The high-energy femtosecond laser has the advantages of narrow pulse width, high peak power, large spectral width and the like, and is widely applied to the fields of hyperfine micromachining, micro-photonic device manufacturing, ultrafast nonlinear optics, terahertz generation, nano bioengineering, national defense laser weapons and the like. The high-energy femtosecond laser output is obtained in the optical fiber, a chirped pulse amplification technology is generally adopted, but due to the structural limitation of the optical fiber, the mode field diameter ratio is smaller, and the nonlinear accumulation of hundreds of micro-focus or even milli-focus high-energy ultrashort pulses is large in the transmission process, so that the finally amplified pulses are difficult to be effectively compressed to obtain ultrashort femtosecond pulses with high signal-to-noise ratio.
The photonic crystal fiber has a large mode field area, the maximum mode field diameter can reach about 100 mu m at present, the pumping absorption efficiency is high, high gain of signal amplification can be realized, the photonic crystal fiber has polarization maintaining output characteristics and light beam quality output close to the diffraction limit, and the laser damage threshold is high, so that the photonic crystal fiber is an ideal gain medium for ultrashort pulse amplification.
At present, a common amplification mode of the rod-shaped photonic crystal fiber is a single-pass amplifier, a basic optical path of the single-pass amplifier is shown in fig. 1, a signal end and a lens 31 focus and couple signal light into a rod-shaped photonic crystal fiber 32, and the signal light is reflected out through a dichroic mirror 34. The pumping end of the single-pass amplifier adopts backward pumping, pumping light is coupled into the rod-shaped photonic crystal fiber through a convex lens 36 and a convex lens 33, and dichroic mirrors 34 and 35 are vertically arranged between the convex lens 36 and the convex lens 33. The dichroic mirrors 34 and 35 are highly reflective to signal light of 1030nm and highly transparent to pump light of 976nm, and the dichroic mirrors 34 and 35 are vertically arranged to serve as an isolation of amplified light to prevent amplified laser light from entering the pump LD laser and damaging the pump LD laser, and serve as an exit mirror of the amplified light. The single-pass amplifier is a mature technology at present, but the main defects are that the amplification capability of the rod-shaped optical fiber cannot be fully utilized, and the amplification gain is low.
Disclosure of Invention
Therefore, it is necessary to solve the above problems in the prior art, and the present invention provides a double-pass amplifier for photonic crystal fiber, so as to effectively solve the problems in the prior art.
A double pass amplifier of a photonic crystal fiber, comprising: the device comprises a half-wave plate (1), a polarizing plate (2), a first lens (3), a rod-shaped photonic crystal fiber (5), a second lens (6) and a first dichroic mirror (9) which are coaxially arranged along a first axis in sequence, and a quarter-wave plate or a 45-degree optical rotator (7) and a concave reflector (8) which are coaxially arranged along a second axis, wherein the first axis and the second axis are intersected on an incident surface of the first dichroic mirror (9) facing the rod-shaped photonic crystal fiber (5), and the first dichroic mirror (9) is simultaneously positioned on the second axis;
after passing through the first dichroic mirror (9), the pump light at the pump end is focused and coupled into the rod-shaped photonic crystal fiber (5) by the second lens (6);
after passing through the half-wave plate (1) and the polarizing plate (2) in sequence, the signal light at the signal end is focused and coupled to the rod-shaped photonic crystal fiber (5) through the rod-shaped photonic crystal fiber (5) by the first lens (3), is subjected to first amplification by combining with pump light in the rod-shaped photonic crystal fiber (5), then passes through the second lens (6), passes through the first dichroic mirror (9), is reflected to the quarter-wave plate or 45 ° optical rotator (7) by the first dichroic mirror (9), passes through the quarter-wave plate or 45 ° optical rotator (7), is reflected back to the quarter-wave plate or 45 ° optical rotator (7) by the concave mirror (8) in the primary path, passes through the quarter-wave plate or 45 ° optical rotator (7) again, is reflected by the first dichroic mirror (9), is focused and coupled again through the polarizing plate (6) and passes through the rod-shaped photonic crystal fiber (5), passes through the first secondary amplification by the first lens (3), and is output by combining with the pump light after passing through the second lens (2).
In a preferred embodiment of the present invention, the first axis and the second axis intersect perpendicularly.
In a preferred embodiment of the present invention, the optical fiber further comprises a spherical mirror (4) coaxially disposed between the first lens (3) and the rod-shaped photonic crystal fiber (5), wherein the spherical mirror (4) reflects the pump light passing through the rod-shaped photonic crystal fiber (5) back into the rod-shaped photonic crystal fiber (5).
In a preferred embodiment of the present invention, the spherical center of the spherical reflector (4) is located on the end surface of the rod-shaped photonic crystal fiber (5) facing the polarizer (2).
In a preferred embodiment of the present invention, the optical fiber further includes a second dichroic mirror (10) coaxially disposed on a side of the first dichroic mirror (9) receiving the pump light, and the second dichroic mirror (10) and the first dichroic mirror (9) are disposed in a V-shape.
In a preferred embodiment of the present invention, the first dichroic mirror (9) and the second dichroic mirror (10) are highly reflective to signal light and highly transmissive to pump light, and are disposed perpendicular to each other.
In a preferred embodiment of the present invention, the optical device further includes a third lens (11) coaxially disposed on a side of the second dichroic mirror (10) receiving the pump light.
In a preferred embodiment of the present invention, the second lens (6), the first dichroic mirror (9), the second dichroic mirror (10), and the third lens (11) are disposed in a same lens barrel.
In a preferred embodiment of the present invention, the first lens (3) is a plano-convex lens and is precisely adjustable, and the convex surface of the first lens faces the rod-shaped photonic crystal fiber (5).
In a preferred embodiment of the present invention, the polarizing plate (2) is a thin film polarizing plate.
In a preferred embodiment of the present invention, the signal light is linearly polarized light with a central wavelength of 1030nm or 1053nm.
In a preferred embodiment of the present invention, the pump end uses high power laser to output pump light with a central wavelength of 976 nm.
Compared with the prior art, the bi-pass amplifier of the photonic crystal fiber provided by the invention fully utilizes the amplification capacity of the rod-shaped fiber, so that the signal light passes through the rod-shaped photonic crystal fiber twice, the energy stored in the rod-shaped fiber is extracted, the effective amplification of high-energy ultrashort pulses is realized, and the amplification gain is high.
Drawings
FIG. 1 is a single-pass amplification optical path diagram of a conventional rod-shaped photonic crystal fiber;
FIG. 2 is an optical diagram of a double-pass amplifier of a photonic crystal fiber according to a preferred embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
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. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 2, a preferred embodiment of the present invention provides a double-pass amplifier of a photonic crystal fiber, which includes: the optical fiber comprises a half-wave plate 1, a polarizing plate 2, a first lens 3, a rod-shaped photonic crystal fiber 5, a second lens 6 and a first dichroic mirror 9 which are coaxially arranged along a first axis, and a quarter-wave plate or a 45-degree optical rotator 7 and a concave reflecting mirror 8 which are coaxially arranged along a second axis, wherein the first axis and the second axis are intersected on an incident surface of the first dichroic mirror 9 facing the rod-shaped photonic crystal fiber 5, and the first dichroic mirror 9 is simultaneously positioned on the second axis; after passing through the first dichroic mirror 9, the pump light at the pump end is focused and coupled into the rod-shaped photonic crystal fiber 5 by the second lens 6; after passing through the half-wave plate 1 and the polarizer 2 in sequence, the signal light at the signal end is focused and coupled to the rod-shaped photonic crystal fiber 5 by the first lens 3 and passes through the rod-shaped photonic crystal fiber 5, the signal light is combined with the pump light in the rod-shaped photonic crystal fiber 5 to be amplified for the first time, then the signal light after being amplified for the first time passes through the second lens 6, passes through the first dichroic mirror 9, is reflected to the quarter-wave plate or 45 ° optical rotator 7 by the first dichroic mirror 9, passes through the quarter-wave plate or 45 ° optical rotator 7, is reflected by the concave reflector 8 in the original path back to the quarter-wave plate or 45 ° optical rotator 7, passes through the quarter-wave plate or 45 ° optical rotator 7 again, is reflected by the first dichroic mirror 9, is focused and coupled again by the second lens 6, passes through the rod-shaped photonic crystal fiber 5, is combined with the pump light in the rod-shaped photonic crystal fiber 5 to be amplified for the second time, and then the signal light after being amplified for the second time passes through the first lens 3 and the polarizer 2, and is finally output by the reflected.
Preferably, the first axis and the second axis intersect perpendicularly.
The invention adopts the polarization-maintaining rod-shaped photonic crystal fiber 5 as an amplification gain medium, can reduce the nonlinear accumulation of an optical fiber system, enables the amplified signal light to be effectively compressed, and simultaneously adopts the polarizing plate 2 for polarization control to be matched with the first dichroic mirror 9, the quarter-wave plate or the 45-degree optical rotator 7 and the concave reflector 8 to effectively realize the double-pass amplification of the signal light, thereby obtaining the maximum gain of the signal light.
In this embodiment, the signal light is linearly polarized light, the central wavelength is 1030nm, the power is 800mW, the pulse width is 600ps, the spectral width is 6nm, and the repetition frequency is 200KHz. It should be noted that the set of parameters is only parameters selected in this embodiment, and in other occasions, the wavelength may also be 1053nm, and other application values may be selected for power, pulse width, spectral width, and repetition frequency.
In this embodiment, the half-wave plate 1 is used to adjust the vibration direction of the linear polarization of the signal light, so that the signal light is entirely transmitted through the polarizer 2.
Preferably, the polarizing plate 2 is a thin film polarizing plate which transmits linearly polarized light in a specific vibration direction and reflects light in a vibration direction perpendicular to the transmission direction for constituting a light path for double pass amplification.
In this embodiment, the first lens 3 focuses the signal light transmitted from the polarizer 2, and preferably, the first lens 3 is mounted in a fine adjustment frame and has a fine adjustment function of up, down, left, and right, so that the signal light can be accurately coupled into the rod-shaped photonic crystal fiber 5. In this embodiment, the focal length may be in the range of 17-22mm, but is best at 20mm. It will be appreciated that the focusing action of the first lens 3 allows coupling of signal light into the rod-shaped photonic crystal fiber 5 and, at optimum coupling, ensures that most of the energy of the signal light is in the core of the rod-shaped photonic crystal fiber 5.
In this embodiment, the bi-pass amplifier of the photonic crystal fiber further includes a spherical mirror 4 coaxially disposed between the first lens 3 and the rod-shaped photonic crystal fiber 5, and the spherical mirror 4 reflects the pump light passing through the rod-shaped photonic crystal fiber 5 back to the rod-shaped photonic crystal fiber 5. Specifically, the spherical center of the spherical reflector 4 is located at the end surface of the rod-shaped photonic crystal fiber 5 facing the polarizer 2, so that the pump light output from the rod-shaped photonic crystal fiber 5 returns to the rod-shaped photonic crystal fiber 5 again under the reflection of the spherical reflector 4, and the pump light also passes through the rod-shaped photonic crystal fiber 5 twice, so that the absorption efficiency of the photonic crystal fiber 5 on the pump light is improved, the utilization rate of the pump light can be improved, the heat generated by redundant pump light is reduced, and the stability of the system is improved.
In this embodiment, the rod-shaped photonic crystal fiber 5 is used as a gain medium of a double-pass amplifier of a photonic crystal fiber, and can amplify signal light passing through a fiber core thereof. Specifically, the rod-shaped photonic crystal fiber 5 is a polarization maintaining fiber with a core of 100 μm (the larger the core diameter is, the better), the length is 80cm, the mode field diameter is 76 μm, the signal light numerical aperture is 0.02, the pump absorption coefficient at the wavelength of 976nm is 30dB/m, the outer diameter is 1.7mm, and end caps are welded at both ends.
In this embodiment, the second lens 6 is mainly used for focusing the coupled pump light.
In this embodiment, the quarter-wave plate or 45 ° optical rotator 7 is used to change the polarization direction of the signal light, and ensure that the polarization direction of the signal light passing through twice is rotated by 90 degrees in total, so that the amplified output signal light is finally guided out from the polarizer 2.
In this embodiment, the concave reflecting mirror 8 is used for reflecting the signal light and returning the signal light to the original path.
In this embodiment, the bi-pass amplifier of the photonic crystal fiber further includes a second dichroic mirror 10 coaxially disposed on a side of the first dichroic mirror 9 receiving the pump light, and a V-shaped arrangement is formed between the second dichroic mirror 10 and the first dichroic mirror 9, it can be understood that a forward arrangement mode may be adopted between the second dichroic mirror 10 and the first dichroic mirror 9 to make it be a positive V-shape, and a reverse arrangement mode may also be adopted to make it be an inverted V-shape, i.e., "Λ -shape". Preferably, the first dichroic mirror 9 and the second dichroic mirror 10 are highly reflective to signal light and highly transmissive to pump light, and are disposed perpendicular to each other. The first dichroic mirror 9 and the second dichroic mirror 10 are used for isolating amplified light to prevent amplified laser light (i.e., signal light) from entering the pump LD laser and damaging the pump LD laser, and are used as a dual-pass amplification reflecting mirror to provide dual-pass amplification light path reflection.
In this embodiment, the double-pass amplifier of the photonic crystal fiber further includes a third lens 11, and the third lens 11 is coaxially disposed on a side of the second dichroic mirror 10 receiving the pump light.
Preferably, the second lens 6, the first dichroic mirror 9, the second dichroic mirror 10, and the third lens 11 are provided in the same lens barrel.
In this embodiment, the pumping end uses high power laser to output pumping light with a central wavelength of 976nm, and the numerical aperture of the pumping light is 0.6. The pump light is coupled into the inner cladding of the rod-shaped photonic crystal fiber 5 through the third lens 11 and the second lens 6 in sequence, so as to provide gain for amplification of the rod-shaped photonic crystal fiber 5.
The light path of the double-pass amplifier of the photonic crystal fiber is as follows: the pump light at the pump end passes through the second dichroic mirror 10 and the first dichroic mirror 9 in sequence after being collimated by the third lens 11; and then enters the rod-shaped photonic crystal fiber 5 through the coupling and focusing of the second lens 6, passes through the rod-shaped photonic crystal fiber 5 and is reflected back to the rod-shaped photonic crystal fiber 5 by the spherical reflector 4. The signal end collimates the input signal light to enter the half-wave plate 1, after the polarization adjustment of the half-wave plate 1, the signal light enters the polaroid 2 in the same polarization direction as the transmission direction of the polaroid 2, and almost all the signal light passes through the polaroid 2; then enters the rod-shaped photonic crystal fiber 5 after being focused and coupled by the lens 3, and most of the energy of the signal light is in the fiber core of the rod-shaped photonic crystal fiber 5; after passing through the rod-shaped photonic crystal fiber 5, the signal light is emitted to the first dichroic mirror 9 through the second lens 6, is reflected to the quarter-wave plate or 45-degree optical rotator 7 by the first dichroic mirror 9, passes through the quarter-wave plate or 45-degree optical rotator 7, reaches the concave reflector 8, is reflected back to the quarter-wave plate or 45-degree optical rotator 7 by the concave reflector 8, and passes through the quarter-wave plate or 45-degree optical rotator 7 again, at the moment, the signal light passes through the quarter-wave plate or 45-degree optical rotator 7 twice, and the polarization direction is changed by 90 degrees (vertical to the transmission direction of the polarizing plate 2); then, the signal light is reflected by the dichroic mirror 9 and focused and coupled by the second lens 6 to enter the rod-shaped photonic crystal fiber 5 again, passes through the rod-shaped photonic crystal fiber 5 and then is emitted to the polarizer 2 through the first lens 3, and the polarization direction of the signal light is perpendicular to the transmission direction of the polarizer 2, so that the signal light is reflected and output by the polarizer 2.
It can be understood that when the signal light passes through the rod-shaped photonic crystal fiber 5 for the first time, i.e., the signal light is amplified through the first pass, and when the signal light passes through the rod-shaped photonic crystal fiber 5 in the reverse direction for the second time, i.e., the signal light is amplified through the second pass in combination with the pump light, the signal light can be subjected to double-pass amplification.
It can be understood that, the redundant pump light passing through the rod-shaped photonic crystal fiber 5 exits the end face of the rod-shaped photonic crystal fiber 5 and is emitted and scattered, in the embodiment, the spherical mirror 4 is adopted, and the spherical center of the spherical mirror is located at the output end face of the rod-shaped photonic crystal fiber 5, so that the output pump light returns to the rod-shaped photonic crystal fiber 5 again under the reflection of the spherical mirror 4, thereby improving the utilization rate of the pump light, effectively reducing the heat generated by the redundant pump light, and improving the stability of the bi-pass amplifier of the photonic crystal fiber.
Verification shows that the bi-pass amplifier of the photonic crystal fiber has high-efficiency amplification capacity, and can output ultra-short pulses of more than 70W of amplified light for hundreds of picoseconds under the conditions that the input signal light power is greater than 2.5W and the pump light power reaches 200W, and the gain reaches 35 times.
Compared with the prior art, the double-pass amplifier of the photonic crystal fiber provided by the invention adopts the polarization maintaining rod-shaped photonic crystal fiber 5 with a large mode field as an amplification gain medium, so that the nonlinear accumulation of a fiber system can be reduced, the amplified signal light can be effectively compressed, and meanwhile, the polarization control is carried out by adopting the polarizing plate 2, and the double-pass amplification of the signal light is effectively realized by matching with the first dichroic mirror 9, the quarter-wave plate or the 45-degree optical rotator 7 and the concave reflector 8, so that the maximum gain of the signal light is obtained. In addition, the two-way amplifier of the photonic crystal fiber adopts the spherical reflector 4 to reflect the pump light passing through the rod-shaped photonic crystal fiber 5, so that the pump light passes through the rod-shaped photonic crystal fiber 5 twice, the absorption efficiency of the rod-shaped photonic crystal fiber 5 on the pump light is improved, the heat effect generated by the redundant pump light passing through the rod-shaped photonic crystal fiber 5 is reduced, and the stability of the system is improved. Finally, the problem of high-efficiency amplification of high-energy ultrashort pulses in the optical fiber can be effectively solved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A dual pass amplifier for a photonic crystal fiber, comprising: the device comprises a half-wave plate (1), a polarizing plate (2), a first lens (3), a rod-shaped photonic crystal fiber (5), a second lens (6) and a first dichroic mirror (9) which are coaxially and sequentially arranged along a first axis, and a quarter-wave plate or a 45-degree optical rotator (7) and a concave reflector (8) which are coaxially arranged along a second axis, wherein the first axis and the second axis are intersected on an incident surface of the first dichroic mirror (9) facing the rod-shaped photonic crystal fiber (5), and the first dichroic mirror (9) is simultaneously positioned on the second axis; the second dichroic mirror (10) is coaxially arranged on one side, which receives the pump light, of the first dichroic mirror (9);
after passing through the first dichroic mirror (9), the pump light at the pump end is focused and coupled into the rod-shaped photonic crystal fiber (5) by the second lens (6);
after passing through the half-wave plate (1) and the polarizer (2) in sequence, the signal light at the signal end is focused and coupled to the rod-shaped photonic crystal fiber (5) by the first lens (3) and passes through the rod-shaped photonic crystal fiber (5), the signal light is combined with the pump light in the rod-shaped photonic crystal fiber (5) for the first amplification, then, the signal light after the first amplification passes through the second lens (6), passes through the first dichroic mirror (9), is reflected to the quarter-wave plate or 45 ° optical rotator (7) by the first dichroic mirror (9), passes through the quarter-wave plate or 45 ° optical rotator (7), is reflected by the concave mirror (8) in the original path back to the quarter-wave plate or 45 ° optical rotator (7), passes through the quarter-wave plate or 45 ° optical rotator (7) again, is reflected by the first dichroic mirror (9), is focused and coupled again by the second lens (6) and passes through the rod-shaped photonic crystal fiber (5), the signal light after the first amplification passes through the rod-shaped photonic crystal fiber (5) again, is amplified again by the first lens (3), and is output after the second amplification by the second reflection, the signal light after the second amplification, and the second amplification is combined with the pump light (2);
the first axis and the second axis intersect perpendicularly;
the second dichroic mirror (10) and the first dichroic mirror (9) are arranged in a V shape.
2. The photonic crystal fiber double-pass amplifier according to claim 1, further comprising a spherical mirror (4) coaxially disposed between the first lens (3) and the rod-shaped photonic crystal fiber (5), the spherical mirror (4) reflecting the pump light passing through the rod-shaped photonic crystal fiber (5) back into the rod-shaped photonic crystal fiber (5).
3. The double-pass amplifier of photonic crystal fiber according to claim 2, wherein the spherical center of the spherical mirror (4) is located at the end face of the rod-shaped photonic crystal fiber (5) facing the polarizer (2).
4. The double pass amplifier of photonic crystal fiber of claim 3, wherein said first dichroic mirror (9) and said second dichroic mirror (10) are highly reflective for signal light and highly transmissive for pump light, and are arranged perpendicular to each other.
5. The double-pass amplifier of photonic crystal fiber according to claim 4, further comprising a third lens (11) coaxially disposed on a side of the second dichroic mirror (10) receiving the pump light.
6. The double pass amplifier for photonic crystal fiber according to claim 5, wherein the second lens (6), the first dichroic mirror (9), the second dichroic mirror (10) and the third lens (11) are disposed in the same barrel.
7. Double pass amplifier for photonic crystal fibers according to claim 1, characterized in that the first lens (3) is a plano-convex lens and is precisely tunable, with its convex surface facing the rod-shaped photonic crystal fiber (5).
8. Double pass amplifier for photonic crystal fibers according to claim 1, characterized in that the polarizer (2) is a thin film polarizer.
9. The double pass amplifier of photonic crystal fiber as claimed in claim 1, wherein the signal light is linearly polarized light with a central wavelength of 1030nm or 1053nm.
10. The double-pass amplifier of photonic crystal fiber as claimed in claim 1, wherein the pump end uses high power laser to output pump light with a central wavelength of 976 nm.
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| CN108039639A (en) * | 2017-12-05 | 2018-05-15 | 中国科学院西安光学精密机械研究所 | Multi-pass ultrashort pulse laser amplifier based on single crystal optical fiber polarization control |
| CN108539565A (en) * | 2018-04-18 | 2018-09-14 | 中国电子科技集团公司第十研究所 | A kind of laser amplifier system |
| CN111244737B (en) * | 2020-01-17 | 2021-05-14 | 武汉安扬激光技术有限责任公司 | Rod-shaped photonic crystal fiber amplifier |
| CN111721990A (en) * | 2020-06-01 | 2020-09-29 | 贵州江源电力建设有限公司 | Miniaturized optical fiber current sensor and information processing system |
| CN111721993A (en) * | 2020-06-19 | 2020-09-29 | 贵州江源电力建设有限公司 | High-sensitivity miniaturized current detection system |
| CN116865077A (en) * | 2023-07-07 | 2023-10-10 | 武汉安扬激光技术股份有限公司 | Multi-core multi-pass rod-shaped photonic crystal fiber amplifier |
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