CN206250566U - A kind of narrow linewidth linear polarization polarization-maintaining full-optical-fiber laser - Google Patents
A kind of narrow linewidth linear polarization polarization-maintaining full-optical-fiber laser Download PDFInfo
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- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model is related to pulse optical fiber technical field, specifically related to a kind of narrow linewidth linear polarization polarization-maintaining full-optical-fiber laser, including single-frequency laser seed source, modulator, two-stage single-mode optical fiber amplifier, the large mode field double-cladding fiber amplifier of one-level 10/130, the polarizer, the large mode field double clad polarization maintaining optical fibre amplifier of one-level 10/130 and the large mode field double clad polarization maintaining optical fibre amplifier of one-level 25/250 being sequentially connected.It is combined by by non PM fiber amplifier and polarization maintaining optical fibre amplifier, the high-power output for realizing stabilization solves the problems, such as full polarization fiber amplifier high cost again, single-frequency laser power is higher, meet the demand of practical application, apparatus structure is simple, high conversion efficiency, good stability, noise are small.
Description
Technical Field
The utility model relates to a pulse fiber laser technical field, concretely relates to narrow linewidth linear polarization-maintaining all-fiber laser.
Background
The single-frequency fiber laser has the advantages of narrow line width, long coherent length, low noise, high conversion efficiency and the like, and can be widely applied to the fields of nonlinear processes, optical measurement, quantum optics, fiber sensing technology, coherent synthesis and the like. For example: on a military weapon system, the fiber laser can be used for submarine communication, laser radar, mine detection, non-lethal weapons and the like, while the general fiber laser cannot provide the requirements of the fields on high precision and long distance, and the adoption of a single-frequency fiber laser and coherent detection is almost the best choice; in the aspect of optical fiber sensing, a single-frequency optical fiber laser is used as a light source for coherent detection, so that the detection sensitivity of signals can reach-100 dB, namely, one hundred billion weak optical signals; in the field of nonlinear frequency conversion, a high-power narrow-linewidth single-frequency fiber laser is an important light source for nonlinear frequency conversion, and can be used as a pumping source of an OPO (optical fiber optical) and frequency-doubled fundamental frequency light, and in the frequency doubling process, the frequency doubling efficiency is in direct proportion to the power density of the fundamental frequency light and is related to the linewidth of the fundamental frequency light. The high-power single-frequency fiber laser has the advantages of high power density and narrow line width, and is very suitable for the application requirement of the nonlinear frequency conversion.
At present, the methods for obtaining single-frequency lasers mainly include the following types: firstly, an ultra-short cavity method is adopted, and the method can increase the longitudinal mode interval in the cavity so as to obtain single longitudinal mode oscillation; secondly, a high-fineness fiber Bragg grating is adopted as a frequency selection element in the cavity, and single-frequency laser output is realized through narrow-band filtering; thirdly, eliminating the space hole burning effect caused by the standing wave by controlling the polarization state of the two meeting light waves in the cavity, thereby inhibiting the multimode oscillation; and fourthly, an F-P etalon is added outside the cavity for mode selection, so that single-mode operation is achieved.
However, the single-frequency laser directly output by these methods has low power and is difficult to meet the requirements of practical applications, and in order to obtain high-power single-frequency laser output, a Master Oscillator Power Amplifier (MOPA) is usually adopted to amplify the single-frequency laser, but these laser devices have complex structures and low conversion efficiency, and the line width is greatly limited by the line width of the seed source. And with the increase of the amplifier stage number, the optical fiber length and the pumping power, the problems of poor system stability, enhanced nonlinear effect, increased thermal effect, increased noise and the like occur, which restricts the further development of the high-power single-frequency optical fiber laser.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists in the above-mentioned problem, the utility model provides a narrow line width linear polarization all fiber laser that keeps partial.
In order to achieve the above object, the present invention provides a narrow linewidth linear polarization maintaining all-fiber laser, which comprises a single-frequency laser seed source, a modulator, a two-stage single-mode fiber amplifier, 10/130 large mode field double-clad fiber amplifier, a polarizer, 10/130 large mode field double-clad polarization maintaining fiber amplifier and 25/250 large mode field double-clad polarization maintaining fiber amplifier, which are connected in sequence; wherein,
the single-frequency laser seed source is used for generating single-frequency continuous laser;
any signal generator is connected with the modulator to apply a modulation signal to the modulator;
the modulator is used for modulating the single-frequency continuous laser into pulse laser;
the two-stage single-mode fiber amplifier is used for carrying out the first-stage pre-amplification and the second-stage pre-amplification on the pulse laser to obtain pre-amplified pulse laser;
the 10/130 large mode field double-clad fiber amplifier is used for amplifying the pre-amplified pulse laser to obtain a third-stage pre-amplified pulse laser;
the polarizer is used for converting the third-stage pre-amplified pulse laser into linearly polarized light;
the 10/130 large-mode-field double-cladding polarization-maintaining optical fiber amplifier is used for amplifying the linearly polarized light to obtain first amplified linearly polarized light;
the 25/250 large-mode-field double-cladding polarization-maintaining fiber amplifier is used for amplifying the first amplified linearly polarized light to obtain second-stage amplified linearly polarized light.
In the narrow-linewidth linear polarization maintaining all-fiber laser, preferably, the linewidth of the single-frequency laser seed source is less than 100kHz, and the central wavelength is 1064 nm.
In the narrow-linewidth linear polarization-maintaining all-fiber laser, the modulator is preferably an electro-optical intensity modulator, and the modulation with repetition frequency from 1kHz to 100kHz is preferably realized.
In the narrow-linewidth linear polarization-maintaining all-fiber laser, preferably, the two-stage single-mode fiber amplifier includes a semiconductor pump source, a wavelength division multiplexer, a single-mode gain fiber, and a band-pass filter, which are connected in sequence;
the wavelength division multiplexer is an 980/1064nm wavelength division multiplexer, and the bandwidth is 5 nm;
the single-mode gain fiber is an ytterbium-doped single-mode non-polarization-maintaining gain fiber;
the band-pass filter (center wavelength is 1064nm, and bandwidth is 2 nm.
In the narrow-linewidth linear polarization-maintaining all-fiber laser, preferably, the 10/130 large-mode-field double-clad fiber amplifier includes a multimode semiconductor pump source, (2+1) x1 beam combiner, 10/130 large-mode-field gain fiber and an isolator which are connected in sequence;
the inlet and outlet tail fibers of the (2+1) x1 beam combiner are all 10/130 non-polarization-maintaining passive fibers;
the isolator is a 2W/2kW non-polarization-maintaining isolator, the central wavelength is 1064nm, and the inlet and outlet tail fibers are 10/130 passive fibers;
the 10/130 large mode field gain fiber is a 10/130 ytterbium-doped large mode field double-clad non-polarization-maintaining gain fiber.
In the narrow-linewidth linear polarization-maintaining all-fiber laser, preferably, the polarizer is an optical fiber online polarizer.
In the narrow-linewidth linear polarization-maintaining all-fiber laser, preferably, the input and output pigtails of the polarizer are both 10/130 ytterbium-doped polarization-maintaining fibers.
In the narrow-linewidth linear polarization-maintaining all-fiber laser, preferably, the 10/130 large-mode-field double-clad polarization-maintaining fiber amplifier includes a multimode pump LD, a polarization-maintaining (2+1) x1 beam combiner, a 10/130 polarization-maintaining gain fiber and a polarization-maintaining isolator, which are connected in sequence;
the inlet and outlet tail fibers of the polarization-maintaining (2+1) x1 beam combiner are all 10/130 polarization-maintaining passive optical fibers;
the polarization maintaining isolator is a 2W/2kW polarization maintaining isolator, the central wavelength is 1064nm, and both the inlet and outlet tail fibers are 10/130 polarization maintaining passive fibers;
the 10/130 polarization-maintaining gain fiber is a 10/130 ytterbium-doped large-mode-field double-cladding polarization-maintaining gain fiber.
In the narrow-linewidth linear polarization-maintaining all-fiber laser, preferably, the 25/250 large-mode-field double-clad polarization-maintaining fiber amplifier includes a multimode pump LD, a polarization-maintaining (6+1) x1 beam combiner, a 25/250 polarization-maintaining gain fiber and a 30W/30kW polarization-maintaining isolator, which are connected in sequence;
the inlet and outlet tail fibers of the polarization-maintaining (6+1) x1 beam combiner are both 25/250 passive polarization-maintaining fibers;
the central wavelength of the 30W/30kW polarization-maintaining isolator is 1064nm, the input tail fiber is 10/130 polarization-maintaining passive fiber, and the output tail fiber is 25/250 polarization-maintaining passive fiber;
the 25/250 polarization-maintaining gain fiber is a 25/250 ytterbium-doped large-mode-field double-cladding polarization-maintaining gain fiber.
In the technical scheme, the embodiment of the utility model provides a narrow linewidth linear polarization maintaining all-fiber laser compares it through combining together non-polarization maintaining fiber amplifier and polarization maintaining fiber amplifier with prior art, has realized stable high power output and has solved the problem that full polarization maintaining fiber amplifier cost is too high again, and single-frequency laser power is higher, satisfies practical application's demand, device simple structure, and conversion efficiency is high, and stability is good, small in noise.
Drawings
Fig. 1 is a schematic structural diagram of a narrow linewidth linear polarization maintaining all-fiber laser according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a two-stage single-mode fiber amplifier of a narrow linewidth polarization maintaining all-fiber laser according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an 10/130 large mode field double clad fiber amplifier of a narrow linewidth linear polarization maintaining all-fiber laser according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of 10/130 large mode field double-clad polarization maintaining fiber amplifier and 25/250 large mode field double-clad polarization maintaining fiber amplifier of a narrow linewidth linear polarization maintaining all fiber laser according to an embodiment of the present invention.
Description of reference numerals:
1. a single-frequency laser seed source; 2. a modulator; 3. an arbitrary signal generator; 4. a single mode fiber amplifier; 401. a semiconductor pump source; 402. a wavelength division multiplexer WDM; 403. a single mode gain fiber; 404. a band-pass filter; 5. 10/130 large mode field double clad fiber amplifier; 501. a multimode semiconductor pump source; 502. (2+1) x1 beam combiner; 503. 10/130 large mode field gain fiber; 504. an isolator; 6. a polarizer; 7. 10/130 large mode field double-clad polarization maintaining fiber amplifier; 701. a multimode pump LD; 702. a polarization maintaining (2+1) x1 beam combiner; 703. 10/130 polarization maintaining gain fiber; 704. a polarization maintaining isolator; 8. 25/250 large mode field double-clad polarization maintaining fiber amplifier; 801. a polarization maintaining (6+1) x1 beam combiner; 802. 25/250 polarization maintaining gain fiber; 803. 30W/30kW polarization maintaining isolator.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description of specific embodiments thereof, which is illustrated in the accompanying drawings.
Example 1:
the narrow-linewidth linear polarization-maintaining all-fiber laser comprises a single-frequency laser seed source 1, a modulator 2, a two-stage single-mode fiber amplifier 4, an 10/130 large-mode-field double-clad fiber amplifier 5, a polarizer 6, a 10/130 large-mode-field double-clad polarization-maintaining fiber amplifier 7 and a 25/250 large-mode-field double-clad polarization-maintaining fiber amplifier 8 which are connected in sequence as shown in figure 1; wherein, the single-frequency laser seed source 1 is used for generating single-frequency continuous laser. An arbitrary signal generator 3 is connected to the modulator 2 to apply a modulation signal to the modulator 2. The modulator 2 is used to modulate the single-frequency continuous laser light into pulse laser light. The two-stage single-mode fiber amplifier 4 is used for carrying out the first-stage pre-amplification and the second-stage pre-amplification on the pulse laser to obtain pre-amplified pulse laser. 10/130 the large mode field double clad fiber amplifier 5 is used to amplify the pre-amplified pulse laser to obtain the third stage pre-amplified pulse laser. The polarizer 6 is used for converting the third-stage pre-amplified pulse laser into linearly polarized light. 10/130 the large mode field double cladding polarization maintaining fiber amplifier 7 is used to amplify the linearly polarized light to obtain the first amplified linearly polarized light. 25/250 the large mode field double cladding polarization maintaining fiber amplifier 8 is used to amplify the first amplified linearly polarized light to obtain the second stage amplified linearly polarized light. The line width of the single-frequency laser seed source 1 is less than 100kHz, the central wavelength is 1064nm, and the output power is 25 mW. The modulator 2 is an electro-optical intensity modulator, which implements modulation of the repetition frequency from 1kHz to 100 kHz. The polarizer 6 is an optical fiber on-line polarizer, and the input and output tail fibers of the polarizer 6 are both 10/130 ytterbium-doped polarization maintaining optical fibers.
Through combining together non-polarization maintaining fiber amplifier and polarization maintaining fiber amplifier, realized stable high power output and solved the too high problem of full polarization maintaining fiber amplifier cost again, single-frequency laser power is higher, satisfies practical application's demand, and device simple structure, conversion efficiency is high, and stability is good, small in noise.
As shown in fig. 2, the two-stage single-mode fiber amplifier 4 includes a semiconductor pump source 401, a wavelength division multiplexer 402, a single-mode gain fiber 403, and a band-pass filter 404, which are connected in sequence; the wavelength division multiplexer 402 is an 980/1064nm wavelength division multiplexer with a bandwidth of 5 nm; the single-mode gain fiber 403 is an ytterbium-doped single-mode non-polarization-maintaining gain fiber; the bandpass filter 404 has a center wavelength of 1064nm and a bandwidth of 2 nm.
As shown in fig. 3, the 10/130 large mode field double clad fiber amplifier 5 includes a multimode semiconductor pump source 501, a (2+1) x1 beam combiner 502, a 10/130 large mode field gain fiber 503 and an isolator 504 connected in sequence. (2+1) the inlet and outlet tail fibers of the x1 beam combiner 502 are all 10/130 non-polarization-maintaining passive fibers; the isolator 504 is a 2W/2kW non-polarization-maintaining isolator, the central wavelength is 1064nm, and the inlet and outlet tail fibers are 10/130 passive fibers; 10/130 the large mode field gain fiber 503 is a 10/130 ytterbium-doped large mode field double-clad non-polarization-maintaining gain fiber.
As shown in fig. 4, the 10/130 large mode field double-clad polarization-maintaining fiber amplifier 7 includes a multimode pump LD701, a polarization-maintaining (2+1) x1 combiner 702, a 10/130 polarization-maintaining gain fiber 703 and a polarization-maintaining isolator 704 connected in sequence. The inlet and outlet tail fibers of the polarization-maintaining (2+1) x1 beam combiner 702 are both 10/130 polarization-maintaining passive fibers; the polarization maintaining isolator 704 is a 2W/2kW polarization maintaining isolator, the central wavelength is 1064nm, and both the inlet and outlet tail fibers are 10/130 polarization maintaining passive fibers; the 10/130 polarization maintaining gain fiber 703 is a 10/130 ytterbium-doped large mode field double-clad polarization maintaining gain fiber. 25/250 large mode field double cladding polarization maintaining fiber amplifier 8 comprises multimode pump LD801, polarization maintaining (6+1) x1 beam combiner 802, 25/250 polarization maintaining gain fiber 803 and 30W/30kW polarization maintaining isolator 804 connected in sequence. The inlet and outlet pigtails of the polarization-maintaining (6+1) x1 beam combiner 802 are both 25/250 passive polarization-maintaining fibers; the central wavelength of the 30W/30kW polarization-maintaining isolator 804 is 1064nm, the input tail fiber is 10/130 polarization-maintaining passive fiber, and the output tail fiber is 25/250 polarization-maintaining passive fiber; 25/250 the polarization maintaining gain fiber 803 is 25/250 ytterbium doped large mode field double cladding polarization maintaining gain fiber.
When in specific use:
the single-frequency continuous laser output by the single-frequency laser seed source 1 firstly enters the electro-optical modulator 2, the modulation result is determined by the modulation depth and the modulation pulse width of the electro-optical modulator 2 and the signal applied by the arbitrary signal generator 3, and the single-frequency continuous laser is modulated into the pulse laser with the pulse width of 10 ns. The output power of the modulated pulse laser after passing through a two-stage single-mode fiber amplifier 4 and a 10/130 large-mode-field double-clad fiber amplifier 5 is amplified to hundreds of milliwatts, and the output laser is the first amplified pulse laser. The polarizer converts the third-stage pre-amplified pulse laser into linearly polarized light. The linearly polarized light after polarization is amplified by 10/130 large mode field double-cladding polarization-maintaining fiber amplifier 7 and 25/250 large mode field double-cladding polarization-maintaining fiber amplifier 8 and then output. Different temperature gradients and pressure gradients are applied to different parts of the 25/250 polarization maintaining gain fiber 803 in the amplification process, and the threshold value of stimulated Brillouin in the amplification process is further increased. Finally, we obtained stable linearly polarized laser outputs with average powers of 26W and 13W at repetition frequencies of 10kHz and 1kHz, respectively, and light-light efficiencies of 68% and 61%, respectively.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A narrow linewidth linear polarization maintaining all-fiber laser, comprising: the single-frequency laser polarization maintaining fiber amplifier comprises a single-frequency laser seed source (1), a modulator (2), a two-stage single-mode fiber amplifier (4), a first-stage 10/130 large-mode-field double-clad fiber amplifier (5), a polarizer (6), a first-stage 10/130 large-mode-field double-clad polarization maintaining fiber amplifier (7) and a first-stage 25/250 large-mode-field double-clad polarization maintaining fiber amplifier (8) which are sequentially connected; wherein,
the single-frequency laser seed source (1) is used for generating single-frequency continuous laser;
any signal generator (3) is connected with the modulator (2) to apply a modulation signal to the modulator (2);
the modulator (2) is used for modulating the single-frequency continuous laser into pulse laser;
the two-stage single-mode fiber amplifier (4) is used for pre-amplifying the pulse laser in a first stage and a second stage to obtain pre-amplified pulse laser;
the 10/130 large mode field double-clad fiber amplifier (5) is used for amplifying the pre-amplified pulse laser to obtain a third-stage pre-amplified pulse laser;
the polarizer (6) is used for converting the third-stage pre-amplified pulse laser into linearly polarized light;
the 10/130 large-mode-field double-cladding polarization-maintaining optical fiber amplifier (7) is used for amplifying the linearly polarized light to obtain a first amplified linearly polarized light;
the 25/250 large-mode-field double-cladding polarization-maintaining fiber amplifier (8) is used for amplifying the first amplified linearly polarized light to obtain second-stage amplified linearly polarized light.
2. The narrow linewidth linear polarization maintaining all fiber laser of claim 1, wherein: the linewidth of the single-frequency laser seed source (1) is less than 100kHz, and the central wavelength is 1064 nm.
3. The narrow linewidth linear polarization maintaining all fiber laser of claim 1, wherein: the modulator (2) is an electro-optical intensity modulator and realizes modulation of repetition frequency from 1kHz to 100 kHz.
4. The narrow linewidth linear polarization maintaining all fiber laser of claim 1, wherein: the two-stage single-mode fiber amplifier (4) comprises a semiconductor pumping source (401), a wavelength division multiplexer (402), a single-mode gain fiber (403) and a band-pass filter (404) which are connected in sequence;
the wavelength division multiplexer (402) is an 980/1064nm wavelength division multiplexer, and the bandwidth is 5 nm;
the single-mode gain fiber (403) is an ytterbium-doped single-mode non-polarization-maintaining gain fiber;
the center wavelength of the band-pass filter (404) is 1064nm, and the bandwidth is 2 nm.
5. The narrow linewidth linear polarization maintaining all fiber laser of claim 1, wherein: the 10/130 large mode field double-clad fiber amplifier (5) comprises a multimode semiconductor pump source (501), (2+1) x1 beam combiner (502), a 10/130 large mode field gain fiber (503) and an isolator (504) which are connected in sequence;
the inlet and outlet tail fibers of the (2+1) x1 beam combiner (502) are all 10/130 non-polarization-maintaining passive fibers;
the isolator (504) is a 2W/2kW non-polarization-maintaining isolator, the central wavelength is 1064nm, and the inlet and outlet tail fibers are 10/130 passive fibers;
the 10/130 large mode field gain fiber (503) is a 10/130 ytterbium-doped large mode field double-clad non-polarization-maintaining gain fiber.
6. The narrow linewidth linear polarization maintaining all fiber laser of claim 1, wherein: the polarizer (6) is an optical fiber on-line polarizer.
7. The narrow linewidth linear polarization maintaining all fiber laser of claim 6, wherein: the input and output tail fibers of the polarizer (6) are both 10/130 ytterbium-doped polarization maintaining fibers.
8. The narrow linewidth linear polarization maintaining all fiber laser of claim 1, wherein: the 10/130 large-mode-field double-cladding polarization-maintaining fiber amplifier (7) comprises a multimode pump LD (701), a polarization-maintaining (2+1) x1 beam combiner (702), a 10/130 polarization-maintaining gain fiber (703) and a polarization-maintaining isolator (704) which are connected in sequence;
the inlet and outlet tail fibers of the polarization-maintaining (2+1) x1 beam combiner (702) are both 10/130 polarization-maintaining passive fibers;
the polarization maintaining isolator (704) is a 2W/2kW polarization maintaining isolator, the central wavelength is 1064nm, and both the inlet and outlet tail fibers are 10/130 polarization maintaining passive fibers;
the 10/130 polarization-maintaining gain fiber (703) is a 10/130 ytterbium-doped large-mode-field double-cladding polarization-maintaining gain fiber.
9. The narrow linewidth linear polarization maintaining all fiber laser of claim 1, wherein: the 25/250 large-mode-field double-cladding polarization-maintaining fiber amplifier (8) comprises a multimode pump LD (801), a polarization-maintaining (6+1) x1 beam combiner (802), a 25/250 polarization-maintaining gain fiber (803) and a 30W/30kW polarization-maintaining isolator (804) which are connected in sequence;
the inlet and outlet tail fibers of the polarization-maintaining (6+1) x1 beam combiner (802) are both 25/250 passive polarization-maintaining fibers;
the central wavelength of the 30W/30kW polarization-maintaining isolator (804) is 1064nm, the input tail fiber is 10/130 polarization-maintaining passive fiber, and the output tail fiber is 25/250 polarization-maintaining passive fiber;
the 25/250 polarization-maintaining gain fiber (803) is a 25/250 ytterbium-doped large-mode-field double-cladding polarization-maintaining gain fiber.
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