CN109818238A - A kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect - Google Patents
A kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect Download PDFInfo
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- CN109818238A CN109818238A CN201910270217.7A CN201910270217A CN109818238A CN 109818238 A CN109818238 A CN 109818238A CN 201910270217 A CN201910270217 A CN 201910270217A CN 109818238 A CN109818238 A CN 109818238A
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Abstract
The invention discloses a kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect, it include picosecond pulse seed source, first fibre optic isolater, first pumping source, first optical fibre wavelength division multiplexer, first Yb dosed optical fiber, second fibre optic isolater, tunable notch filter, second pumping source, first optical fibre wavelength division multiplexer, second Yb dosed optical fiber and third fibre optic isolater, the present invention is by introducing tunable notch filter in amplification link, filter out the lower spectrum wave crest of energy accounting of picosecond pulse, its spectrum is set to revert to bell spectrum, according to Fourier transform principle, the process, which is equivalent in time domain, adjusts impulse waveform to nearly Gaussian, to inhibit the spectrum of Self-phase modulation to expand effect.So that amplifier exports pulse energy under conditions of keeping pulse narrow-band characteristic and improves several times to a magnitude, and keep pulse temporal pulsewidth almost unchanged.
Description
Technical field
The present invention relates to laser precision machinings, laser cleaning technique field, more particularly to one kind to be based on light spectrum reshaping effect
Narrowband picosecond pulse fiber amplifier, the front-end amplifier as big energy picosecond laser system, with the front end fiber amplifier
Device improves the high-fidelity amplifying power to narrowband picosecond pulse seed laser.
Background technique
The narrowband of 1 micron waveband, big energy picosecond laser have in fields such as laser precision machining, laser cleaning and spectroscopy
It is widely used.For a long time, main oscillations amplification (MOPA) dress of solid amplifier is cascaded by all solid state mode locking oscillator
Set, people available energy reach joule grade narrowband picosecond light source.In recent years, as Totally positive dispersion passive mode-locking mixes ytterbium
The development of Fiber laser technology, it has been found that, by also can produce several picoseconds extremely in intracavitary insertion 1nm or less narrow band filter
The nearly Transform Limited Pulses of the hundreds of picoseconds of pulsewidths such as not, pulsewidth can be designed by filtering bandwidth and be controlled.This optical fiber skin
Second light source not only shows the time-frequency characteristic comparable with solid picosecond source, also has many advantages, such as good beam quality, compact-sized,
Therefore it is also used to develop big energy narrowband picosecond light source.
In order to carry out pulse energy promotion, be based on narrowband picosecond fiber oscillator device, have been developed at present fiber amplifier,
The amplification of solid traveling wave and solid regenerated amplifier.Fiber amplifier has the advantages that high-efficient, compact-sized and perfect heat-dissipating,
But the sectional area of optical fiber is small, length is long, in order to avoid non-linear caused spectrum distortion excessive in fiber amplifier, generally adopts
The picosecond pulse output level of several μ J, peak power 1MW just can be achieved with rod-type optical fibre travelling-wave amplifier, nevertheless, by
In intrinsic damage threshold and critical self-focusing, the damage that high-peak power may cause, this makes current optical fiber picosecond amplifier
Output pulse energy is difficult to break through 10 μ J；For this purpose, people combine traditional solid-state traveling-wave amplifier with optical fiber seed light source,
So-called optical fiber solid mixing MOPA scheme is developed.Solid amplifier has stronger amplifying power and lower non-linear,
This is proven in traditional all solid state MOPA system, but it is for seed energy also requirement with higher,
Studies have shown that signal pulse energy sufficiently high is to inhibit the detrimental non-linears dynamics such as point shape and chaos in solid amplifier
The key factor of process, and improve the efficiency of traveling wave amplification, simplify amplifier architecture, it reduces heat and generates and keep hot spot matter
An important factor for amount.The output pulse energy (~ 0.1nJ) of fiber oscillator device 2 magnitudes lower than solid-state oscillator (> 10nJ) with
On, cause direct solid amplification to have difficulties.In order to solve this problem, fiber amplifier is used to pre-lift and enters solid-state to put
The signal pulse energy of big device.
However, make the raising of pulse energy in optical fiber link with amplifier gain is improved, Self-phase modulation (SPM) with
The increase of nonlinear phase shift continue stretched-out spectrum, thus be more than solid state gain medium gain spectrum width (such as emission cross section compared with
Big Nd:YVO4, Nd:YAG gain spectrum width be respectively less than 0.6 nm), so that amplified pulse power spectrum density is lower, i.e., effectively
Energy is still lower.If keeping narrowband amplification, the amplifying power of fiber amplifier will be clamped down on, and use single mode optical fiber at present
The pulse energy that the 10ps pulse of system amplification export at narrowband (~ 0.5nm) is horizontal in ~ 2nJ, limits and mixes MOPA device
Energy level.
Therefore, the narrowband picosecond pulse fiber amplifier technology based on light spectrum reshaping is studied, the narrowband amplification of amplifier is improved
Ability is of great significance with reaching the output energy level comparable with solid-state oscillator.
Summary of the invention
The object of the invention is to remedy the disadvantages of known techniques, provides a kind of narrowband skin based on light spectrum reshaping effect
Pulse per second (PPS) fiber amplifier.
The present invention is achieved by the following technical solutions:
A kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect, includes picosecond pulse laser, the first light
Fiber isolator, the first pumping source, the first optical fibre wavelength division multiplexer, the first Yb dosed optical fiber, the second fibre optic isolater, tunable trap
Filter, the second pumping source, the first optical fibre wavelength division multiplexer, the second Yb dosed optical fiber and third fibre optic isolater, picosecond
The output port of pulse pulse laser is connected with the input port of the first fibre optic isolater, the output end of the first fibre optic isolater
Mouth is connected with the port one of the first optical fibre wavelength division multiplexer, the port two of the first optical fibre wavelength division multiplexer and the first pumping source phase
Even, the port three of the first optical fibre wavelength division multiplexer is connected with the input terminal of the first Yb dosed optical fiber, the other end of the first Yb dosed optical fiber
It is connected with the input port of the second fibre optic isolater, the output end and tunable notch filter output end of the second fibre optic isolater
It is connected, the output end of tunable notch filter is connected with the port one of the second optical fibre wavelength division multiplexer, and the second optical fiber wavelength division is multiple
It is connected with the port two of device with the second pumping source, the port three of the second optical fibre wavelength division multiplexer and the input terminal of the second Yb dosed optical fiber
It is connected, the other end of the second Yb dosed optical fiber is connected with the input port of third fibre optic isolater, the output of third fibre optic isolater
Port exports amplified picosecond pulse.
The central wavelength of the picosecond pulse laser is 1000 ~ 1100nm, and spectrum full width at half maximum is 10pm ~ 1nm, arteries and veins
Rush 1 ~ 900ps of width, pulse energy 10pJ ~ 20nJ.
The doping component of first Yb dosed optical fiber and the second Yb dosed optical fiber is ytterbium element, and doped substrate is glassy silicate
Glass, 5 ~ 20 μm of fibre-optic mode field diameter range.
The trap peak transmittance of the tunable notch filter be 0 ~ 20%, trap full width at half maximum bandwidth be 10pm ~
1nm, trap center wavelength tuning range are 1000 ~ 1100nm.
The invention has the advantages that the present invention intends to solve that fiber amplifier narrowband amplifying power is limited by self phase modulation
The problem of, by providing a kind of narrowband picosecond fiber amplifier scheme based on light spectrum reshaping effect, realize 60nJ energy above
Picosecond pulse sequence output.
For the present invention by introducing tunable notch filter in amplification link, the energy accounting for filtering out picosecond pulse is lower
Spectrum wave crest, so that its spectrum is reverted to bell spectrum, according to Fourier transform principle, which is equivalent to pulse in time domain
Waveform is adjusted to nearly Gaussian, so that the spectrum for inhibiting or weakening Self-phase modulation expands effect.So that amplifier is keeping narrow
Output pulse energy improves several times to a magnitude under conditions of band, and keeps pulse full width at half maximum almost unchanged.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Specific embodiment
As shown in Figure 1, a kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect, includes picosecond pulse
Laser 1, the first fibre optic isolater 2, the first pumping source 3, the first optical fibre wavelength division multiplexer 4, the first Yb dosed optical fiber 5, the second light
Fiber isolator 6, tunable notch filter 7, the second pumping source 8, the first optical fibre wavelength division multiplexer 9,10 and of the second Yb dosed optical fiber
Third fibre optic isolater 11, the input port phase of the output port of the picosecond pulse laser 1 and the first fibre optic isolater 2
Even, the output port of the first fibre optic isolater 2 is connected with the port one of the first optical fibre wavelength division multiplexer 4, and the first optical fiber wavelength division is multiple
It is connected with the port two of device 4 with the first pumping source 3, the port three of the first optical fibre wavelength division multiplexer 4 is defeated with the first Yb dosed optical fiber 5
Enter end to be connected, the other end of the first Yb dosed optical fiber 5 is connected with the input port of the second fibre optic isolater 6, the second fibre optic isolater 6
Output end be connected with 7 output end of tunable notch filter, the output end of tunable notch filter 7 and the second optical fiber wavelength division
The port one of multiplexer 9 is connected, and the port two of the second optical fibre wavelength division multiplexer 9 is connected with the second pumping source 8, the second optical fiber wavelength division
The port three of multiplexer 9 is connected with the input terminal of the second Yb dosed optical fiber 10, the other end and third optical fiber of the second Yb dosed optical fiber 10
The input port of isolator 11 is connected, and the output port of third fibre optic isolater 11 exports amplified picosecond pulse.
The central wavelength of the picosecond pulse seed source 1 is 1000 ~ 1100nm, and spectrum full width at half maximum is 10pm ~ 1nm,
1 ~ 900ps of pulse width, pulse energy 10pJ ~ 20nJ.
The doping component of first Yb dosed optical fiber 5 and the second Yb dosed optical fiber 10 is ytterbium element, and doped substrate is silicic acid
Salt glass, 5 ~ 20 μm of fibre-optic mode field diameter range.
The trap peak transmittance of the tunable notch filter 7 is 0 ~ 20%, and trap full width at half maximum bandwidth is 10pm
~ 1nm, trap center wavelength tuning range are 1000 ~ 1100nm.
Population reversion, picosecond pulse laser 1 occur for the first Yb dosed optical fiber 5 under the pumping of the first pumping source 3
Emit picosecond pulse laser and enters the first Yb dosed optical fiber 5, arteries and veins through the first fibre optic isolater 2 and the first optical fibre wavelength division multiplexer 4
The energy of punching is amplified, and self phase modulation causes the broadening of spectrum, and pulse is caused to pass through spectrum after the second fibre optic isolater 6
With two peak structure, the central wavelength for adjusting tunable notch filter filters out the lesser wave crest of energy ratio of spectrum, then equivalent
In having filtered out blue shift or red shift light at porch hangover in the time domain, time domain impulse waveform is developed to Gaussian waveform.Due to
The Gaussian differentiation of the nonlinear phase shift and time domain waveform functional dependence that Self-phase modulation introduces, impulse waveform is conducive to inhibit certainly
Spectrum widening caused by phase-modulation.
Claims (4)
1. a kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect, it is characterised in that: include picosecond pulse
Laser, the first fibre optic isolater, the first pumping source, the first optical fibre wavelength division multiplexer, the first Yb dosed optical fiber, the second Fiber isolation
Device, tunable notch filter, the second pumping source, the first optical fibre wavelength division multiplexer, the second Yb dosed optical fiber and third Fiber isolation
The output port of device, the picosecond pulse seed source is connected with the input port of the first fibre optic isolater, the first Fiber isolation
The output port of device is connected with the port one of the first optical fibre wavelength division multiplexer, the port two of the first optical fibre wavelength division multiplexer and first
Pumping source is connected, and the port three of the first optical fibre wavelength division multiplexer is connected with the input terminal of the first Yb dosed optical fiber, the first Yb dosed optical fiber
The other end be connected with the input port of the second fibre optic isolater, the output end of the second fibre optic isolater and tunable notch filter
Device output end is connected, and the output end of tunable notch filter is connected with the port one of the second optical fibre wavelength division multiplexer, the second light
The port two of fine wavelength division multiplexer is connected with the second pumping source, the port three of the second optical fibre wavelength division multiplexer and the second Yb dosed optical fiber
Input terminal be connected, the other end of the second Yb dosed optical fiber is connected with the input port of third fibre optic isolater, third Fiber isolation
The output port of device exports amplified picosecond pulse.
2. a kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect according to claim 1, feature
Be: the central wavelength of the picosecond pulse laser is 1000 ~ 1100nm, and spectrum full width at half maximum is 10pm ~ 1nm, pulse
1 ~ 900ps of width, pulse energy 10pJ ~ 20nJ.
3. a kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect according to claim 1, feature
Be: the doping component of first Yb dosed optical fiber and the second Yb dosed optical fiber is ytterbium element, and doped substrate is silicate glass,
5 ~ 20 μm of fibre-optic mode field diameter range.
4. a kind of narrowband picosecond pulse fiber amplifier based on light spectrum reshaping effect according to claim 1, feature
Be: the trap peak transmittance of the tunable notch filter be 0 ~ 20%, trap full width at half maximum bandwidth be 10pm ~
1nm, trap center wavelength tuning range are 1000 ~ 1100nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615241A (en) * | 2020-12-03 | 2021-04-06 | 天津大学 | High-peak power single-frequency narrow-linewidth nanosecond triangular short pulse fiber laser |
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| US5986789A (en) * | 1996-03-07 | 1999-11-16 | Nippon Telegraph And Telephone Corporation | Optical transmission line and optical transmission system |
| CN101667709A (en) * | 2008-09-04 | 2010-03-10 | 中国科学院西安光学精密机械研究所 | Tunable high-power optical fiber picosecond laser system |
| CN103001118A (en) * | 2012-12-04 | 2013-03-27 | 广东汉唐量子光电科技有限公司 | Gain narrowing controlled all-fiber laser amplifier for high-power picosecond pulses |
| US9401580B1 (en) * | 2015-05-27 | 2016-07-26 | Lumentum Switzerland Ag | Optical source with passive pulse shaping |
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2019
- 2019-04-04 CN CN201910270217.7A patent/CN109818238A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5986789A (en) * | 1996-03-07 | 1999-11-16 | Nippon Telegraph And Telephone Corporation | Optical transmission line and optical transmission system |
| CN101667709A (en) * | 2008-09-04 | 2010-03-10 | 中国科学院西安光学精密机械研究所 | Tunable high-power optical fiber picosecond laser system |
| CN103001118A (en) * | 2012-12-04 | 2013-03-27 | 广东汉唐量子光电科技有限公司 | Gain narrowing controlled all-fiber laser amplifier for high-power picosecond pulses |
| US9401580B1 (en) * | 2015-05-27 | 2016-07-26 | Lumentum Switzerland Ag | Optical source with passive pulse shaping |
Non-Patent Citations (3)
| Title |
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| HONGJUN LIU等: "Compact tunable high power picosecond source based on Yb-doped fiber amplification of gain switch laser diode", 《OPTICS EXPRESS》 * |
| V. RIZOU等: "Semiconductor Optical Amplifier Pattern Effect Suppression Using Optical Notch Filtering", 《JOURNAL OF ENGINEERING SCIENCE AND TECHNOLOGY REVIEW》 * |
| 周炳琨等: "《激光原理》", 31 January 2009 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615241A (en) * | 2020-12-03 | 2021-04-06 | 天津大学 | High-peak power single-frequency narrow-linewidth nanosecond triangular short pulse fiber laser |
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