CN114039264A - Pre-charging quick-start fiber laser - Google Patents
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- 239000000835 fiber Substances 0.000 title claims abstract description 83
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 66
- 238000005086 pumping Methods 0.000 claims abstract description 65
- 239000013307 optical fiber Substances 0.000 claims abstract description 57
- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 238000002955 isolation Methods 0.000 claims abstract description 20
- 238000005253 cladding Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 230000010287 polarization Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 11
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- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012994 industrial processing Methods 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- 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
- H01S3/06729—Peculiar transverse fibre profile
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- 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
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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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
- H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
- H01S3/0933—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of a semiconductor, e.g. light emitting 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
- H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
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Abstract
The invention discloses a pre-charging quick start fiber laser, which comprises a control system, wherein the control system is connected with a driving system, and the driving system is respectively connected with a seed source laser, a first pumping diode and a second pumping diode; the seed source laser, the low-power photoelectric isolator, the pre-amplification active optical fiber, the first-stage optical coupler, the isolation filter, the main amplification active optical fiber, the second-stage optical coupler and the isolator are sequentially connected, and the isolator outputs finally amplified laser; the first stage optical coupler is connected with the output end of the first pumping diode; the second stage optical coupler is connected with the output end of the second pumping diode. According to the invention, the seed source laser and the pumping secondary tube first pulse delay energy are controlled by the control system, so that the active optical fiber is precharged, the laser pulse is ensured to be rapidly established, and the laser processing quality is improved.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a pre-charging quick-start fiber laser.
Background
The fiber laser has the advantages of high brightness, narrow pulse width, high photoelectric conversion efficiency, easy maintenance and the like, so the fiber laser is widely applied to the field of industrial processing. However, in the process of processing the photosensitive material, the pulse setup time is too long due to unstable initial energy of the laser, and a virtual point or gradual color difference occurs at the initial stage of laser processing, which affects the laser processing quality. Therefore, a new fiber laser is urgently needed to improve the laser processing quality.
Disclosure of Invention
The invention aims to provide a pre-charging quick-start optical fiber laser which can be quickly started through pre-charging and has stable energy, so that the laser processing quality is improved.
The technical scheme adopted by the invention is as follows:
a pre-charged fast-starting fiber laser comprises a control system, a driving system, a seed source laser, a low-power photoelectric isolator, a pre-amplification active fiber, a first-stage optical coupler, an isolation filter, a main amplification active fiber, a second-stage optical coupler, an isolator, a first pumping diode and a second pumping diode;
the control system is connected with the driving system, and the driving system is respectively connected with the seed source laser, the first pumping diode and the second pumping diode; the seed source laser, the low-power photoelectric isolator, the pre-amplification active optical fiber, the first-stage optical coupler, the isolation filter, the main amplification active optical fiber, the second-stage optical coupler and the isolator are sequentially connected, and the isolator outputs finally amplified laser; the first-stage optical coupler is connected with the output end of a first pumping diode, and the first pumping diode charges energy to the pre-amplification active optical fiber to realize first-stage amplification of the laser; the second-stage optical coupler is connected with the output end of a second pumping diode, and the second pumping diode charges energy to the main amplification-stage active optical fiber to realize second-stage amplification of the laser;
the control system controls the driving system to work, further controls the seed source laser, the first pumping diode and the second pumping diode to output pulses with the same frequency, and controls the light emitting time of the first pumping diode and the second pumping diode to be earlier than the light emitting time of the first pulse of the seed source laser.
The control system sends an instruction to the driving system to meet the normal operation of the seed source laser, the first pumping diode and the second pumping diode, and ensure that the laser output energy is amplified to the required multiplying power.
In a further scheme, the light-emitting time of the first pump diode and the second pump diode is at least 800 mus earlier than the first pulse light-emitting time of the seed source laser.
The further proposal is that the output energy of the seed source laser is 1mW, the central wavelength is 1060 nm-1065 nm, and the tail fiber is Hi1060 optical fiber or polarization maintaining optical fiber.
The maximum isolation energy of the low-power optical isolator is 300mW, the isolation center wavelength is 1060 nm-1064 nm, a band-pass filter with the wavelength of 8 nm-14 nm is plated inside the optical isolator, and the tail fiber is Hi1060 optical fiber or polarization maintaining optical fiber; the highest isolation energy of the isolation filter is 1W-2W, the isolation center wavelength is 1060 nm-1064 nm, an 8 nm-14 nm band-pass filter is plated inside the optical isolator, and the tail fiber is 10/125 um. The type selection can ensure the laser amplification efficiency, and avoid the situation that the output signal light is too small and cannot be effectively amplified after being reabsorbed by the pre-amplification active optical fiber and the main amplification active optical fiber.
The further scheme is that the pre-amplification-stage active optical fiber is a high-absorption-coefficient double-cladding ytterbium-doped optical fiber, the size of a fiber core is 6-12 um, the numerical aperture of the fiber core is 0.08, the numerical aperture of an inner cladding is larger than 0.46, and the length of the optical fiber is 4.5-6.5 m. The main amplification stage active fiber is a double-clad ytterbium-doped fiber with a high absorption coefficient, the size of a fiber core is 15-25 um, the numerical aperture of the fiber core is 0.08, the numerical aperture of an inner cladding is larger than 0.46, and the length of the fiber is 4-6.5 m; the generation of ASE can be well inhibited through the type selection, the interference of the ASE on the energy stability is avoided, and the stable output of laser is realized.
The central wavelength of the output of the first pumping diode is 915nm, the highest output energy in a continuous state is 10W, the tail fiber is 105/125um, and the numerical aperture is 0.22; the central wavelength of the output of the second pumping diode is 915nm, the highest output energy in a continuous state is 30W, the tail fiber is 105/125um, and the numerical aperture is 0.22. The method ensures the rapid establishment of the laser pulse, reduces the establishment time of the laser pulse, avoids the interference of ASE on the energy stability and realizes the stable output of the laser.
The further scheme is that the output energy of the pre-amplification stage is 300-380mW, and the output energy of the main amplification stage laser is 15-20W, so that the condition that the laser peak power approaches or exceeds the damage threshold of the pre-amplification stage active optical fiber and the main amplification stage active optical fiber is avoided, and the obvious nonlinear effect is avoided.
In the invention, the seed source laser is used for outputting pulse laser. The first and second pump diodes are used for charging energy to the active optical fiber and providing conditions for the amplification of the pulse laser. The control system sends an instruction to the drive system to enable the output frequencies of the seed source laser, the first pumping diode and the second pumping diode to be consistent; and the first pumping diode and the second pumping diode give certain light-emitting time delay to the seed source pulse laser before the light is initially emitted. The low-power optical isolator mainly aims at preventing feedback light from exciting a seed source laser, and the isolation filter is beneficial to reasonably inhibiting ASE besides isolating the feedback light, so that the second-stage amplification efficiency and the system stability are improved.
The invention has the beneficial effects that:
the two-stage amplification structure is adopted, 18W energy output of the laser is realized, the output energy is stable, and the laser processing quality is improved;
the method has the advantages that the seed source laser and the first pulse delay energy of the pumping secondary tube are accurately controlled, so that the active optical fiber is precharged, the rapid establishment of laser pulses is ensured, and the phenomenon that the initial energy charging of the active optical fiber is insufficient, so that the pulse establishment time is too long, a virtual point or gradual chromatic aberration occurs at the initial stage of laser processing, and the laser processing quality is influenced is avoided;
the laser pulse establishing time is reduced by adjusting the frequency and the output delay of a seed source laser and a diode pump (a first pump diode and a second pump diode);
the control system sends an instruction to the driving system, so that the seed source laser, the first pumping diode and the second pumping diode emit pulse signals with the same frequency, and the seed source laser is given certain light-emitting time delay before the initial pulse of the first pumping diode and the second pumping diode, thereby reducing the laser pulse establishing time and improving the laser processing quality; the energy of the seed source laser is prevented from being absorbed by the active optical fiber due to insufficient initial energy charging, the initial pulse amplification efficiency is reduced, and the processing quality is not influenced;
by strictly controlling the device type selection, the pumping mode and the two-stage amplification factor, the generation of ASE is well inhibited, the interference of the ASE on the energy stability is avoided, and the stable output requirement of laser is realized.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a pre-charged fast start fiber laser;
FIG. 2 is a schematic diagram of a pulsed pumping technique;
FIG. 3 is a diagram showing a comparison of energy of output pulse sequences when different initial pump diodes charge the active fiber, where a is a diagram of pre-charge energy with low pulse energy, b is a diagram of pre-charge energy with high pulse energy, and c is a diagram of optimal pulse energy for pre-charge energy;
in the figure: 1. a control system; 2. a drive system; 3. a seed source laser; 4. a low power optical isolator; 5. a pre-amplifier stage active fiber; 6. a first stage optical coupler; 7. a first pumping diode; 8. an isolation filter; 9. a main amplification stage active optical fiber; 10. a second stage optical coupler; 11. a second pumping diode; 12. an isolator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a pre-charge energy fast start fiber laser includes a control system 1, a driving system 2, a seed source laser 3, a low-power optical isolator 4, a pre-amplification stage active fiber 5, a first stage optical coupler 6, an isolation filter 8, a main amplification stage active fiber 9, a second stage optical coupler 10, an isolator 12, a first pump diode 7, and a second pump diode 11.
The control system 1 is connected with the driving system 2, and the driving system 2 is respectively connected with the seed source laser 3, the first pumping diode 7 and the second pumping diode 11; the seed source laser 3, the low-power photoelectric isolator 4, the pre-amplification stage active optical fiber 5, the first stage optical coupler 6, the isolation filter 8, the main amplification stage active optical fiber 9, the second stage optical coupler 10 and the isolator 12 are sequentially connected, and the isolator 12 outputs finally amplified laser; the first-stage optical coupler 6 is connected with the output end of a first pumping diode 7, and the first pumping diode 7 charges energy to the pre-amplification active optical fiber 5 to realize first-stage amplification of the laser; the second-stage optical coupler 10 is connected with the output end of the second pumping diode 11, and the second pumping diode 11 charges energy to the main amplification-stage active optical fiber 9 to realize the second-stage amplification of the laser. The control system 1 controls the driving system 2 to work, and then controls the output pulses and the light emitting time of the seed source laser 3, the first pump diode 7 and the second pump diode 11, specifically: the control system 1 sends an initial instruction to the driving system 2, so that the seed source laser 3, the first pumping diode 7 and the second pumping diode 11 output pulses with the same frequency, and the light emitting time of the first pumping diode 7 and the second pumping diode 11 is earlier than the first pulse light emitting time of the seed source laser 3. In the preferred embodiment, the first pulse light-out time of the seed source laser 3 is 800 μ s later than the light-out time of the first pump diode 7 and the second pump diode 11.
In the invention, the output energy of the seed source laser 3 is 1mW, the central wavelength is 1064nm, the tail fiber is Hi1060 optical fiber, the pulse broadband is in nanosecond level, the frequency is adjustable, and the driving system 2 is used for driving and outputting milliwatt (mW) level laser. The highest isolation energy of the low-power optical isolator 4 is 300mW, the isolation center wavelength is 1064nm, a 14nm band-pass filter is plated inside the optical isolator, and the tail fiber is Hi 1060. The highest isolation energy of the isolation filter 8 is 2W, the isolation center wavelength is 1062nm, a 9nm band-pass filter is plated inside the optical isolator, and the tail fiber is 10/125 um. The pre-amplification stage active optical fiber 5 is a high-absorption coefficient double-clad ytterbium-doped optical fiber, the size of the optical fiber is 10/125um, the numerical aperture of a fiber core is 0.08, the numerical aperture of an inner cladding is larger than 0.46, and the length of the optical fiber is 5.5 m. The main amplification stage active fiber 9 is a double-clad ytterbium-doped fiber with a high absorption coefficient, the size of the fiber is 20/125um, the numerical aperture of a fiber core is 0.08, the numerical aperture of an inner cladding is larger than 0.46, and the length of the fiber is 5.5 m. The central wavelength output by the first pumping diode 7 is 915nm, the highest output energy in a continuous state is 10W, the tail fiber is 105/125um, and the numerical aperture is 0.22; the central wavelength 915nm of the output of the second pumping diode 11, the highest output energy in the continuous state is 30W, the tail fiber is 105/125um, and the numerical aperture is 0.22.
The control system 1 controls the light-emitting energy, the time delay and the frequency of the seed source laser 3, the first pumping diode 7 and the second pumping diode 11; the specific logic time sequence is shown in fig. 2, before the seed source laser 3 emits light, the control system 1 gives a pre-light-emitting signal to the first pump diode 7 and the second pump diode 11, so that the two pump diodes output weak light energy, after a certain time delay, the seed source laser 3 outputs a light signal with a certain frequency, and simultaneously the two pump diodes output light signals with the same frequency and strong intensity. This is to ensure that each pulse of the seed source laser 3 can be reasonably amplified, and it is necessary to ensure that the frequencies of the seed source laser 3, the first pump diode 7 and the second pump diode 11 are the same; in the amplification process, because the pre-amplification active optical fiber and the main amplification active optical fiber 9 absorb the seed light and the pump light, an initial pulse sequence cannot obtain effective gain, so that the early-stage pulse energy shows a trend of low front and high back, the pulse establishment time is prolonged, and before the laser emits light, the first pump diode 7 and the second pump diode 11 inject pump energy into the pre-amplification active optical fiber 5 and the main amplification active optical fiber 9 in advance to ensure that the optical fibers inject the pump energy into the optical fibersCompleting original energy charging, the initial pulse sequence output by the seed source laser 3 can quickly extract the original energy storage of the gain optical fiber to realize the required output power of the first pulse laser, and when the injection signals are consistent, the first pulse power P is determined by the pre-injection current I and the pre-injection time T2The energy and particle lifetime of the pre-amplifier stage active fiber 5 and the main amplifier stage active fiber 9 are determined to be about 780 μ s, so that when T2 is greater than 800 μ s, the first pulse energy is mainly determined by the magnitude of the pre-injection current I. If the pre-injection current I is too large, the phenomenon that the first pulse is too high can occur; if the pre-injection current I is too small, the first pulse is too low, so that the initial pre-injection current needs to be accurately controlled, and the optimal output energy of the initial pulse sequence is ensured. As shown in fig. 3, by accurately controlling the pre-injection current, the problems of too low energy of the initial pulse sequence and too long pulse setup time are well solved.
In the laser amplification process, Amplified Spontaneous Emission (ASE) is formed by spontaneously-radiated photons through a gain fiber, after the ASE is reflected by an end face, the ASE is Amplified in the gain fiber to cause self-excited oscillation, so that laser output is unstable, and the risk of burning out the pre-amplification stage active fiber 5, the main amplification stage active fiber 9, the reverse breakdown light isolation low-power optical isolator 4, the isolation filter 8 and the seed source laser 3 exists.
The pre-amplification active fiber 5 and the main amplification active fiber 9 are ytterbium-doped particle active fibers, the service life of energy level particles is about 780 mu s, ASE can be inhibited, and the phenomenon that the ASE is too large due to long-term light emission of pump laser is avoided.
When the amplification factors of the pre-amplification stage and the main amplification stage are too high, the laser peak power approaches or exceeds the damage threshold values of the pre-amplification stage active fiber 5 and the main amplification stage active fiber 9, and an obvious nonlinear effect appears, and the specific formula is as follows:
wherein t ispIs the laser output pulse width in nanoseconds. Due to the nonlinear effect ofThe most important factor restricting the peak power of the pulse fiber laser is that compared with a continuous fiber laser, the peak power of the pulse fiber laser is improved by 2-3 orders of magnitude, and a single optical fiber bears the high peak power of hundreds of kW to MW level. Therefore, the optical pulse is easy to interact with the optical fiber medium to generate a nonlinear effect, so that the spectral width of the output of the system is widened, the output power generates longitudinal mode competition due to the spectral widening, the signal-to-noise ratio of the output light beam is further reduced, and the output power is unstable. Since the pre-amplifier stage energy is lower than the main amplifier stage energy and the corresponding pre-amplifier stage peak power is lower than the main amplifier stage peak power, the pre-amplifier stage amplification factor is higher than the main amplifier stage amplification factor. In order to prevent the laser peak power from approaching or exceeding the damage threshold of the pre-amplifier stage active fiber 5 and the main amplifier stage active fiber 9, the pre-amplifier stage output energy of the present invention is 350mW, and the main amplifier stage laser output energy is 18W.
In the amplification process of a large signal (mW magnitude), under the condition that the pumping power is not changed, the output optical power is increased along with the increase of the signal optical power, the gain coefficient is reduced along with the increase of the signal optical input power, and the gain saturation effect occurs. The ASE lasing optical power is reduced with the increase of the signal optical power because although the ASE lasing optical gain is higher than the signal optical gain, with the continuous increase of the signal optical power in the optical fiber, in the competition with the longitudinal mode of the ASE effect lasing wavelength, the advantages of the signal optical are continuously enlarged, the stimulated emission effect is stronger and stronger, and the amplified spontaneous emission effect is suppressed. Therefore, the two-stage amplification structure adopts a backward pumping mode, the laser amplification efficiency is ensured, and the situation that the output signal light is too small and cannot be effectively amplified after being re-absorbed by the pre-amplification active optical fiber 5 and the main amplification active optical fiber 9 is avoided.
The nonlinear effects of the pre-amplifier stage active fiber 5 and the main amplifier stage active fiber 9 are divided into elastic scattering and inelastic scattering, and the non-energy exchange between the polarized medium and the electromagnetic field is called elastic scattering. Common elastic scattering includes self-phase modulation effects (SPM), four-wave mixing (FWM), etc., which cause phase changes in the spectral components of the pulse. Inelastic scattering causes a portion of the energy to be transferred to other spectral components, creating multiple pulses while causing frequency broadening. Common inelastic scattering is mainly Stimulated Brillouin Scattering (SBS) and Stimulated Raman Scattering (SRS), wherein, in nanosecond laser amplification, the most common nonlinear effects are SBS, SRS and SPM, which can be improved by changing the fiber length and the fiber cross section. Therefore, in order to improve the nonlinear effect, the absorption coefficients of the pre-amplifier stage active fiber 5 and the main amplifier stage active fiber 9 can be increased, and the length of the pre-amplifier stage active fiber 5 and the main amplifier stage active fiber 9 in the invention is 5.5 m.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A pre-charging quick start fiber laser is characterized in that: the system comprises a control system, a driving system, a seed source laser, a low-power photoelectric isolator, a pre-amplification active optical fiber, a first-stage optical coupler, an isolation filter, a main amplification active optical fiber, a second-stage optical coupler, an isolator, a first pumping diode and a second pumping diode;
the control system is connected with the driving system, and the driving system is respectively connected with the seed source laser, the first pumping diode and the second pumping diode; the seed source laser, the low-power photoelectric isolator, the pre-amplification active optical fiber, the first-stage optical coupler, the isolation filter, the main amplification active optical fiber, the second-stage optical coupler and the isolator are sequentially connected, and the isolator outputs finally amplified laser; the first-stage optical coupler is connected with the output end of a first pumping diode, and the first pumping diode charges energy to the pre-amplification active optical fiber to realize first-stage amplification of the laser; the second-stage optical coupler is connected with the output end of a second pumping diode, and the second pumping diode charges energy to the main amplification-stage active optical fiber to realize second-stage amplification of the laser;
the control system controls the driving system to work, further controls the seed source laser, the first pumping diode and the second pumping diode to output pulses with the same frequency, and controls the light emitting time of the first pumping diode and the second pumping diode to be earlier than the light emitting time of the first pulse of the seed source laser.
2. The pre-charged fast start fiber laser of claim 1, wherein: the light emitting time of the first pumping diode and the second pumping diode is at least 800 mus earlier than the first pulse light emitting time of the seed source laser.
3. A pre-charged fast start fiber laser according to claim 1 or 2, characterized in that: the output energy of the seed source laser is 1mW, the central wavelength is 1060 nm-1065 nm, and the tail fiber is Hi1060 optical fiber or polarization maintaining optical fiber.
4. The pre-charged fast start fiber laser of claim 1, wherein: the maximum isolation energy of the low-power optical isolator is 300mW, the isolation center wavelength is 1060 nm-1064 nm, a band-pass filter with the wavelength of 8 nm-14 nm is plated inside the optical isolator, and the tail fiber is Hi1060 optical fiber or polarization maintaining optical fiber.
5. The pre-charged fast start fiber laser of claim 1, wherein: the highest isolation energy of the isolation filter is 1W-2W, the isolation center wavelength is 1060 nm-1064 nm, an 8 nm-14 nm band-pass filter is plated inside the optical isolator, and the tail fiber is 10/125 um.
6. The pre-charged fast start fiber laser of claim 1, wherein: the pre-amplification active optical fiber is a high-absorption-coefficient double-cladding ytterbium-doped optical fiber, the size of a fiber core is 6-12 um, and the length of the optical fiber is 4.5-6.5 m.
7. The pre-charged fast start fiber laser of claim 1, wherein: the main amplification stage active fiber is a double-clad ytterbium-doped fiber with a high absorption coefficient, the size of the fiber core is 15-25 um, and the length of the fiber is 4-6.5 m.
8. The pre-charged fast start fiber laser of claim 1, wherein: the central wavelength of first pump diode output is 915nm, and the highest output energy is 10W under the continuous state, and the tail fiber is 105/125um, and numerical aperture is 0.22.
9. The pre-charged fast start fiber laser of claim 1, wherein: the central wavelength of the output of the second pumping diode is 915nm, the highest output energy in a continuous state is 30W, the tail fiber is 105/125um, and the numerical aperture is 0.22.
10. The pre-charged fast start fiber laser of claim 1, wherein: the output energy of the pre-amplification stage is 300-380mW, and the output energy of the laser of the main amplification stage is 15-20W.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101201528A (en) * | 2007-12-13 | 2008-06-18 | 中国科学院上海光学精密机械研究所 | All-fiber narrow-linewidth hundred-nanosecond pulse signal system |
| CN204030261U (en) * | 2014-08-20 | 2014-12-17 | 广东高聚激光有限公司 | A kind of high-gain full optical fiber laser amplifier |
| CN105186270A (en) * | 2015-09-23 | 2015-12-23 | 深圳市欧凌镭射科技有限公司 | Picosecond pulse optical fiber laser device |
| CN207691192U (en) * | 2017-12-22 | 2018-08-03 | 武汉孚晟科技有限公司 | A kind of fiber pulse amplifier based on shaping pulse |
| CN211265960U (en) * | 2020-02-26 | 2020-08-14 | 吉林省栅莱特激光科技有限公司 | Low-repetition-frequency pulse optical fiber amplifier |
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2021
- 2021-11-30 CN CN202111440490.3A patent/CN114039264A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101201528A (en) * | 2007-12-13 | 2008-06-18 | 中国科学院上海光学精密机械研究所 | All-fiber narrow-linewidth hundred-nanosecond pulse signal system |
| CN204030261U (en) * | 2014-08-20 | 2014-12-17 | 广东高聚激光有限公司 | A kind of high-gain full optical fiber laser amplifier |
| CN105186270A (en) * | 2015-09-23 | 2015-12-23 | 深圳市欧凌镭射科技有限公司 | Picosecond pulse optical fiber laser device |
| CN207691192U (en) * | 2017-12-22 | 2018-08-03 | 武汉孚晟科技有限公司 | A kind of fiber pulse amplifier based on shaping pulse |
| CN211265960U (en) * | 2020-02-26 | 2020-08-14 | 吉林省栅莱特激光科技有限公司 | Low-repetition-frequency pulse optical fiber amplifier |
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