CN110932068A - 1.7 mu m waveband pumping amplification double-modulation high-power repetition frequency adjustable optical fiber laser - Google Patents
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
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- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- 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
- H01S3/10084—Frequency control by seeding
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Abstract
1.7 mu m wave band pumping amplification double modulation high power repetition frequency adjustable optical fiber laser, which belongs to the technical field of optical fiber lasers, and comprises the following components for solving the problems existing in the existing 1.7 mu m wave band laser: the optical fiber Bragg grating photonic crystal fiber tunable laser comprises an arbitrary waveform generator, a first pump laser, a first erbium-doped fiber amplifier, a first optical isolator, a first optical circulator, a first thulium-doped fiber, a photonic crystal fiber, a first fiber coupler, a second optical circulator, a fiber Bragg grating, a second optical isolator, an electronic delayer, a second pump laser, a second erbium-doped fiber amplifier, a third optical isolator, a second optical coupler and a second thulium-doped fiber; the device has compact structure, easy installation and adjustment and good stability by adopting the all-fiber device. The back gain spectrum long-wave part generated by the thulium-doped fiber is inhibited by utilizing the photonic band gap effect of the specially-made photonic crystal fiber, the gain saturation effect of the 1.7 mu m wave band can be inhibited, and the light conversion efficiency of the laser in the 1.7 mu m wave band can be improved.
Description
Technical Field
The invention relates to a 1.7 mu m waveband pumping amplification double-modulation high-power repetition frequency adjustable optical fiber laser, and belongs to the technical field of optical fiber lasers.
Background
The 1.7 mu m wave band laser (1650-1750nm) can be widely applied to the fields of biological imaging, laser medical treatment, polymer laser welding and processing, mid-infrared laser pumping source, organic matter micro-measurement and the like, and becomes one of the hot spots of novel light source research at home and abroad in recent years. Because the optical scattering energy loss of the 1.7 mu m light source in the biological tissue is less, the absorption rate of water in the wave band is lower, and the wave band is positioned at the absorption peak of fat and collagen, the light source is widely applied to the aspect of biological imaging. This region also belongs to the absorption region of molecules such as O-H, C-O, N-O, C-H, etc., for example, the light absorption of transparent polycarbonate materials is more than 80% at wavelengths around 1.7 μm. Compared with other wave bands, the 1.7 mu m laser does not need to add a laser absorbent in the plastic material, and can effectively avoid the influence of introducing impurities, thereby improving the quality and purity of the plastic. And the 1.7 μm pulse laser has a high peak power and a short pulse width, which is very advantageous for laser spot welding and laser seam welding which require extremely high quality plastic products in the medical industry. In addition, the 1.7 mu m wave band high-power laser can be used as a mid-infrared laser pumping source to excite 3-5 mu m wave band laser.
The Chinese patent application number is 201610305758.5, the name is 'a high-power tunable 1.7 mu m mode-locked fiber laser', the high-power seed source part in the laser is a designed 1565nm wave band tunable mode-locked fiber laser, the high-power 1565nm laser enters a soliton self-frequency spectrum device to complete the conversion from the 1565nm wave band to the 1.7 mu m wave band, and the self-unlocking mode-locked laser output and the high-power tuning output can be realized.
However, the fiber laser has the following drawbacks: 1) more spatial light elements are used, such as a polarization beam splitter prism, an 1/4 wave plate, a 1/2 wave plate, and the like. The cavity is internally provided with a space light coupled single-mode fiber structure, so the device has complex assembly and poor environmental stability, and the output light conversion efficiency is low, thereby being difficult to meet the commercial requirement; 2) the 1565nm waveband mode-locked fiber laser part has a fixed cavity length, so that the generated 1.7 mu m waveband laser repetition frequency is difficult to tune.
Disclosure of Invention
The invention provides a 1.7 mu m waveband pumping amplification double-modulation high-power repetition frequency adjustable optical fiber laser which is suitable for all optical fibers and has good stability, and aims to solve the problems of complex assembly, poor environmental stability, low conversion efficiency, difficult repetition frequency tuning and the like of the existing 1.7 mu m waveband laser technology. The 1565nm waveband laser is driven by the arbitrary waveform generator, 1.7 mu m waveband pulse light is generated by a gain switching mechanism, and a thulium-doped optical fiber amplifier is built to carry out optical amplification on the 1.7 mu m laser. Thereby generating 1.7 mu m repetition frequency adjustable high-power pulse laser output.
The technical scheme adopted by the invention is as follows:
1.7 mu m wave band pumping amplification double modulation high power repetition frequency adjustable optical fiber laser, which is characterized by comprising: the optical fiber Bragg grating photonic crystal fiber tunable laser comprises an arbitrary waveform generator, a first pump laser, a first erbium-doped fiber amplifier, a first optical isolator, a first optical circulator, a first thulium-doped fiber, a photonic crystal fiber, a first fiber coupler, a second optical circulator, a fiber Bragg grating, a second optical isolator, an electronic delayer, a second pump laser, a second erbium-doped fiber amplifier, a third optical isolator, a second optical coupler and a second thulium-doped fiber; the random waveform generator is connected with a first pump laser, the first pump laser, a first erbium-doped fiber amplifier, a first optical isolator and an a port of a first optical circulator are sequentially connected through optical fibers, a b port of the first optical circulator, a first thulium-doped fiber, a photonic crystal fiber and a g port of a first optical fiber coupler are sequentially connected through optical fibers, an i port of the first optical fiber coupler is connected with an f port of a second optical circulator through an optical fiber, and a d port of the second optical circulator and a c port of the first optical circulator are connected through optical fibers to form an annular cavity; the e port optical fiber of the second optical circulator is connected with the fiber Bragg grating, and the tail end of the fiber Bragg grating tail fiber is cut into an oblique angle; the h port of the first optical coupler is connected with a second optical isolator, the arbitrary waveform generator is connected with an electronic delayer, the electronic delayer is connected to a second pump laser, and the second pump laser, a second erbium-doped fiber amplifier and a third isolator are sequentially connected through optical fibers; the second isolator and the third isolator are respectively connected with a j port and a k port of the second optical coupler, an L port of the second coupler is connected with the second thulium-doped optical fiber, and the tail end of the second thulium-doped optical fiber is the laser output end.
The invention has the beneficial effects that:
1) the device has compact structure, easy installation and adjustment and good stability by adopting the all-fiber device. The back gain spectrum long-wave part generated by the thulium-doped fiber is inhibited by utilizing the photonic band gap effect of the specially-made photonic crystal fiber, the gain saturation effect of the 1.7 mu m wave band can be inhibited, and the light conversion efficiency of the laser in the 1.7 mu m wave band can be improved.
2) The dual-modulation structure of pumping amplification is adopted, the structure is simple, 1.7 mu m wave band repetition frequency adjustable pulse laser output can be effectively generated by modulating the pumping, and 1.7 mu m wave band high-power pulse output is generated by a modulation amplifier, so that the signal distortion of 1.7 mu m wave band laser pulse caused by amplification is reduced.
Drawings
FIG. 1: the invention discloses a schematic diagram of a 1.7 mu m waveband pumping amplification double-modulation high-power repetition frequency adjustable optical fiber laser.
FIG. 2: the invention discloses an output spectrogram of a 1.7 mu m waveband.
FIG. 3: the invention discloses a 1.7 mu m wave band pulse light output waveform diagram.
FIG. 4: the invention has different repetition frequencies and pulse widths of 1.7 mu m wave band and outputs graphs (repetition frequencies and pulse widths are adjustable).
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the 1.7 μm band pump amplification dual-modulation high-power repetition frequency tunable optical fiber laser of the present invention comprises the following parts: the optical fiber Bragg grating optical fiber laser comprises an arbitrary waveform generator 1, a first pump laser 2, a first erbium-doped optical fiber amplifier 3, a first optical isolator 4, a first optical circulator 5, a first thulium-doped optical fiber 6, a photonic crystal optical fiber 7, a first optical fiber coupler 8, a second optical circulator 9, an optical fiber Bragg grating 10, a second optical isolator 11, an electronic delayer 12, a second pump laser 13, a second erbium-doped optical fiber amplifier 14, a third optical isolator 15, a second optical coupler 16 and a second thulium-doped optical fiber 17.
The arbitrary waveform generator 1 is connected to the first pump laser 2 by a cable. The ports a of the first pump laser 2, the first erbium-doped fiber amplifier 3, the first optical isolator 4 and the first optical circulator 5 are sequentially connected by optical fibers. The port b of the first optical circulator 5, the first thulium-doped optical fiber 6, the photonic crystal optical fiber 7 and the port g of the first optical fiber coupler 8 are sequentially connected through optical fibers. An i port of the first optical fiber coupler 8 is connected with an f port of the second optical circulator 9 through an optical fiber, and a d port of the second optical circulator 9 is connected with a c port of the first optical circulator 5 through an optical fiber to form a ring cavity. The e-port optical fiber of the second optical circulator 9 is connected with the fiber Bragg grating 10, and the tail end of the fiber Bragg grating 10 is cut into an oblique angle of 8 degrees. The h-port of the first optical coupler 8 is connected to the second optical isolator 11. The arbitrary waveform generator 1 is connected to an electronic delay 12 via a cable, and the electronic delay 12 is connected to a second pump laser 13. The second pump laser 13, the second erbium-doped fiber amplifier 14 and the third isolator 15 are sequentially connected by optical fibers. The second isolator 11 and the third isolator 15 are respectively connected to the j port and the k port of the second optical coupler 16, the L port of the second coupler 16 is connected to the second thulium doped optical fiber 17, and the end of the second thulium doped optical fiber 17 is the laser output end.
The arbitrary waveform generator 1 is used for driving a first pump laser 2 to generate 1565 nm-band repetition frequency adjustable pulse laser; the first pump laser 2 and the second pump laser 13 are 1565nm waveband directly-adjustable semiconductor lasers; the output power of the first erbium-doped fiber amplifier 3 is 33dBm at most; the first optical circulator 5 is a three-port optical fiber circulator; the first thulium-doped optical fiber 6 is a laser gain medium; the photonic crystal fiber 7 is used for inhibiting the long-wave part of the back gain spectrum of the thulium-doped fiber, which is more than 1800 nm; the first optical coupler 8 is an 90/10 optical coupler; the second optical circulator 9 is a three-port optical fiber circulator; the fiber Bragg grating 10 is a 1.7 mu m wave band uniform reflection type Bragg grating; the electronic delayer 12 is used for delaying the electric signal generated by the arbitrary waveform generator 1, so that the electric signal is synchronous with the optical signal output by the laser; the second erbium-doped fiber amplifier 14 is a high-power erbium-doped fiber amplifier, and the output power of the second erbium-doped fiber amplifier is 44dBm at most; the second optical coupler 16 is an 50/50 optical coupler. The second thulium-doped optical fiber 17 is used for gain amplification of the generated 1.7 μm waveband laser.
The working process of the 1.7 mu m waveband high-power repetition frequency adjustable pulse optical fiber laser is as follows:
the arbitrary waveform generator 1 drives the first pump laser 2 to make the first pump laser generate 1565 nm-band repetition frequency adjustable pulse laser. The first pump laser 2 is power amplified to watt level by the first erbium doped fiber amplifier 3, passes through the first optical isolator 4 and the a port of the first optical circulator 5, and is injected into the first thulium doped fiber 6 from the b port of the first optical circulator 5. The thulium ions in the thulium-doped optical fiber are excited by excitation3H6Transition of energy level to3F4Energy level, resulting in a 1600nm to 2000nm broadband gain spectrum. Through the photonic band gap effect of the photonic crystal fiber 7, the long wave part of the thulium-doped fiber back-to-gain spectrum is inhibited, and the gain saturation effect of the 1.7 mu m wave band can be inhibited, so that the gain conversion efficiency of the 1.7 mu m wave band is improved.
The gain in the 1.7 μm band in the backward gain spectrum is higher compared to the forward gain spectrum. The resulting 1.7 μm band back-gain spectrum is thus output from the c-port of the first optical circulator 5 and enters the d-port of the second optical circulator 9. The light is output from the e-port of the second optical circulator 9 to the fiber bragg grating 10 for wavelength selection of the 1.7 μm waveband, and the fiber bragg grating 10 reflects the light of the 1.7 μm waveband back to the e-port of the second optical circulator 9 and outputs from the f-port of the second optical circulator 9. Then, light is input from the i port of the first optical coupler 8, and 10% of 1.7 μm-band laser light is output from the h port of the first optical coupler 8. The remaining 90% of the light is output from the g port of the first optical coupler 8 and circulates in the cavity. The arbitrary waveform generator 1 delays the electrical signal through the electronic delay 12, and precisely controls the delay amount to synchronize with the laser output from the h port of the first optical coupler 8. The delayed electric signal drives a second pump laser 13, and the second pump laser 13 performs high-power amplification through a second erbium-doped fiber amplifier 14 to generate 1565 nm-band high-power pump laser. The 1565nm high-power pump light passing through the third isolator 15 and the 1.7 μm band laser output from the h-port of the first optical coupler 8 are injected into the second optical coupler 16 together. The L port of the second optical coupler 16 injects the second thulium-doped optical fiber 17 for pulse light gain amplification, and finally, a high-power optical pulse output of 1.7 μm is obtained.
The first pump laser 2 is driven by the arbitrary waveform generator 1 to generate 1.5 μm wave band pulse light, and 1.7 μm wave band high power pulse laser can be generated by a gain switching mechanism, namely by pulse pumping. By adjusting the modulation frequency and duty ratio of the arbitrary waveform generator, high-power pulse laser output with 1.7 μm wave band and different repetition frequencies and pulse widths can be generated.
As shown in FIG. 2, the 1.7 μm band continuous optical output spectrum of the present invention shows a peak wavelength of 1727.74nm, a 3dB bandwidth of 0.18nm, and a side mode suppression ratio of 62 dB.
As shown in FIG. 3, the pulse light output pattern of the present invention with 1.7 μm wave band outputs pulses with a modulation frequency of 40KHz and a pulse width of 2 μm.
As shown in fig. 4, the present invention has different repetition frequency and pulse width output patterns in 1.7 μm band. The modulation frequency is 40KHz, 80KHz, 120KHz, 150KHz, and the output pulse waveform.
Claims (7)
1.1.7 mu m wave band pumping amplification double modulation high power repetition frequency adjustable optical fiber laser, which is characterized by comprising the following components: the optical fiber tunable laser comprises an arbitrary waveform generator (1), a first pump laser (2), a first erbium-doped fiber amplifier (3), a first optical isolator (4), a first optical circulator (5), a first thulium-doped fiber (6), a photonic crystal fiber (7), a first fiber coupler (8), a second optical circulator (9), a fiber Bragg grating (10), a second optical isolator (11), an electronic delayer (12), a second pump laser (13), a second erbium-doped fiber amplifier (14), a third optical isolator (15), a second optical coupler (16) and a second thulium-doped fiber (17);
the random waveform generator (1) is connected with a first pump laser (2), the ports a of the first pump laser (2), a first erbium-doped fiber amplifier (3), a first optical isolator (4) and a first optical circulator (5) are sequentially connected through optical fibers, the port b of the first optical circulator (5), a first thulium-doped fiber (6), a photonic crystal fiber (7) and the port g of a first optical fiber coupler (8) are sequentially connected through optical fibers, the port i of the first optical fiber coupler (8) is connected with the port f of a second optical circulator (9) through the optical fibers, and the port d of the second optical circulator (9) is connected with the port c of the first optical circulator (5) through the optical fibers to form a ring cavity;
an e-port optical fiber of the second optical circulator (9) is connected with an optical fiber Bragg grating (10), and the tail end of the tail fiber of the optical fiber Bragg grating (10) is cut into an oblique angle;
the h port of the first optical coupler (8) is connected with a second optical isolator (11), the arbitrary waveform generator (1) is connected with an electronic delayer (12), the electronic delayer (12) is connected to a second pump laser (13), and the second pump laser (13), a second erbium-doped fiber amplifier (14) and a third isolator (15) are sequentially connected through optical fibers; the second isolator (11) and the third isolator (15) are respectively connected with a j port and a k port of the second optical coupler (16), an L port of the second coupler (16) is connected with the second thulium-doped optical fiber (17), and the tail end of the second thulium-doped optical fiber (17) is the laser output end.
2. The 1.7 μm band pump-amplified dual-modulated high-power re-frequency tunable optical fiber laser of claim 1, wherein the first pump laser (2) and the second pump laser (13) are 1565nm band directly tunable semiconductor lasers.
3. The 1.7 μm band pump-amplified dual-modulated high-power re-frequency tunable optical fiber laser of claim 1, wherein the photonic crystal fiber (7) is used to suppress the long-wave part above 1800nm of the back-facing gain spectrum of the thulium-doped fiber.
4. The 1.7 μm band pump-amplified dual-modulated high-power re-frequency tunable optical fiber laser of claim 1, wherein the first optical fiber coupler (8) is an 90/10 optical coupler.
5. The 1.7 μm band pump-amplified dual-modulated high-power re-frequency tunable optical fiber laser of claim 1, wherein the fiber bragg grating (10) is a 1.7 μm band uniform reflection bragg grating.
6. The 1.7 μm band pump-amplified dual-modulated high-power re-frequency tunable optical fiber laser of claim 1, wherein the end of the fiber bragg grating (10) pigtail is cut at an oblique angle of 8 °.
7. The 1.7 μm band pump-amplified dual-modulated high-power re-frequency tunable optical fiber laser of claim 1, wherein the second optical coupler (16) is an 50/50 optical coupler.
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| CN112557346A (en) * | 2020-12-11 | 2021-03-26 | 长春理工大学 | Coherence-controllable 1.7-micron waveband non-diffraction light source biological imaging system |
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