CN103715591B - Optical fiber laser device based on spectrum adjustment and implementation method of optical fiber laser device - Google Patents
Optical fiber laser device based on spectrum adjustment and implementation method of optical fiber laser device Download PDFInfo
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- CN103715591B CN103715591B CN201410006142.9A CN201410006142A CN103715591B CN 103715591 B CN103715591 B CN 103715591B CN 201410006142 A CN201410006142 A CN 201410006142A CN 103715591 B CN103715591 B CN 103715591B
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Abstract
The invention discloses an optical fiber laser device based on spectrum adjustment and an implementation method of the optical fiber laser device. The optical fiber laser device comprises a seed source, an erbium-doped optical fiber amplifier, a pulse narrowing system and a frequency doubling filtering system, wherein a polarization controller is arranged at the tail end of a gain optical fiber, and the pulse narrowing system adjusts the length of a pre-chirp optical fiber through a prism pair so that the negative dispersion of the pre-chirp optical fiber and negative dispersion of the prism pair offset the positive dispersion of the gain optical fiber. The magnitude of the negative chirp of a femtosecond pulse is adjusted by adjusting the length of the pre-chirp optical fiber before amplification, and therefore the magnitude of the negative chirp of the femtosecond pulse is controlled before amplification, the nonlinear effect is controlled in the amplification process, and the frequency doubling efficiency is optimized; the polarization controller is added to the gain optical fiber, the polarization degree of an output pulse of an amplifier is adjusted, losses caused when signal light is reflected by the prism pair of the pulse narrowing system are reduced, and therefore higher fundamental frequency optical power is obtained.
Description
Technical field
The present invention relates to optical fiber laser, and in particular to a kind of optical fiber laser adjusted based on spectrum and its realization side
Method.
Background technology
Near infrared ultrashort pulse scatters micro- skill in Terahertz Technology, two photon imaging technology, coherent
The fields such as art have great using value.Application for more than, solid state laser Ti∶sapphire mode-locked laser is to produce
The main flow equipment of raw femtosecond pulse.Although ti sapphire laser has on scientific research field being widely applied very much, they
There is price high, stability is poor, needs Jing often to keep in repair, it is to the stability requirement harshness of working environment etc. a series of to overcome
Shortcoming.This also counteracts that the further development of Ti∶Sapphire laser solid state laser.
Recently as the appearance of the optical fiber laser of femtosecond magnitude, the strong competition of femtosecond solid state laser is also become
Opponent.Its great advantage is miniaturization, efficiency high, saves the energy, good stability.Passive mode-locking erbium doped fiber laser is in experiment
Above and in theory all proved successively.But the nonlinear effect and dispersion when propagation in light due to light can cause
The deformation of ultrashort pulse, thus very improve 1550nm wave bands erbium doped fiber laser mean power, and then be more difficult to obtain compared with
The mean power of the femtosecond pulse of the near infrared band after high frequency multiplication.
At present, Er-doped fiber femto-second laser frequency multiplication of the someone using a both arms repetition rate for 98MHz is obtained
770nm wave bands, mean power is the femto second optical fiber laser of 120 milliwatts, and this kind of optical fiber laser is usually used the week of the type of warbling
The lithium niobate frequency doubler crystal of phase property polarization, commercial frequency-doubling crystal cannot generally obtain higher shg efficiency；By multimode erbium ytterbium
Co-doped fiber amplifier can also obtain the output of similar near-infrared femtosecond laser.But by multimode erbium and ytterbium codoping
In the system of fiber amplifier, it usually needs Lens Coupling, the stability requirement to environment is harsh, is easily lost coupling.In addition,
Using the gain fibre of big mode field area, the original flexible nature of optical fiber is easily lost, its volume is estimated more than similar on the contrary
Meter laser amplifier.
The content of the invention
Utilize saturating when using erbium doped fiber laser signal frequency multiplication for femto second optical fiber laser in above prior art
Mirror coupling instabilty, efficiency are not optimized, using it is specific warble type frequency-doubling crystal the shortcomings of, the present invention propose by adjust
The prechirp fiber lengths of erbium-doped fiber amplifier adjusting femtosecond pulse warbling before amplification, so as to adjust the output of pulse
The optical fiber laser and its implementation of spectrum and output pulse width.
It is an object of the present invention to provide a kind of optical fiber laser adjusted based on spectrum.
The optical fiber laser adjusted based on spectrum of the present invention is included：Seed source, erbium-doped fiber amplifier, pulse compression system
System and frequency multiplication filtering system；Seed source exports pulse, and by prechirp optical fiber erbium-doped fiber amplifier is connected to；Pulse Jing er-dopeds
Fiber amplifier is exported to pulse compression system after amplifying；Passages through which vital energy circulates punching press compression system after pulse compression to transmitting to frequency multiplication filtering system
System, obtains the femto-second laser pulse of Gao Zhongying；Wherein, erbium-doped fiber amplifier includes pumping source, bonder and gain fibre,
The two ends of gain fibre are respectively provided with bonder, and pumping source is introduced gain fibre by bonder；Arrange in the end of gain fibre
Polarization Controller, adjusts the degree of polarization that erbium-doped fiber amplifier exports pulse；Pulse compression system adopts prism pair, adjusts pre- Zhou
Sing the length of optical fiber so that the positive dispersion of gain fibre is offset in the negative dispersion of prechirp optical fiber and prism pair.
Er-doped fiber mode-locked laser is obtained as seed source, export arteries and veins by the use of nonlinear polarization rotation locked mode NPR principles
Punching is injected in erbium-doped fiber amplifier after one section of prechirp optical fiber, erbium-doped fiber amplifier pump by the way of two directional pump
Pu；Then through prism to being compressed to pulse, eventually pass and focus on the femtosecond pulse that frequency multiplication filtering system obtains frequency multiplication
Laser.Prechirp optical fiber adopts single-mode fiber, there is provided negative dispersion, and gain fibre provides negative dispersion.The output pulse of seed source,
In the amplification process of gain fibre, spectrum pinch effect and pulse width variations are caused by Self-phase modulation, the present invention is by adjusting
The length of prechirp optical fiber, controls the femtosecond pulse negative size warbled before amplification to control the non-thread in amplification process
Property effect, so as to optimize shg efficiency.
The present invention introduces Polarization Controller in the end of the gain fibre of erbium-doped fiber amplifier, adjusts Erbium-doped fiber amplifier
Device exports the degree of polarization of pulse so that the power of the output pulse of prism pair is maximum, reduces due to the prism of pulse compression system
The loss that reflection to flashlight is caused, so as to obtain higher fundamental frequency luminous power.
Further object is that providing a kind of implementation method of the optical fiber laser adjusted based on spectrum.
The implementation method of the optical fiber laser adjusted based on spectrum of the present invention, is comprised the following steps：
1）According to actual needs, design the length range of prechirp optical fiber and adjust spacing；
2）The length of adjustment prechirp optical fiber, seed source output pulse, is connected to Er-doped fiber and puts by prechirp optical fiber
Big device amplifies, and the degree of polarization of output pulse is adjusted by the Polarization Controller in gain fibre, to reduce prism to pulsed light
The loss that reflection causes, exports to pulse compression system after amplification；
3）Measure spectrum width, and measure compression after pulse width, adjust prism to the distance between so that compression
Pulse width afterwards is minimum；
4）Transmit after pulse compression to frequency multiplication filtering system, measurement obtains shg efficiency；
5）Increase the length of prechirp optical fiber, repeat step 2 according to spacing is adjusted）～4）, until in prechirp optical fiber
Till point in length range is all finished, into step 6）；
6）Curve chart of the shg efficiency with the length change of prechirp optical fiber is obtained, shg efficiency highest point is found, with
This point is set to the length of prechirp optical fiber.
Advantages of the present invention：
（1）Femtosecond pulse is adjusted using by adjusting the prechirp fiber lengths of erbium-doped fiber amplifier before amplification
The negative size warbled, controls the femtosecond pulse negative size warbled before amplification to control the non-linear effect in amplification process
Should, so as to optimize shg efficiency；
（2）Using Polarization Controller is added in the gain fibre of erbium-doped fiber amplifier, amplifier output pulse is adjusted
Degree of polarization, reduce the loss caused to the reflection to flashlight due to the prism of pulse compression system, it is higher so as to obtain
Fundamental frequency luminous power.
Description of the drawings
Fig. 1 is the structural representation of one embodiment of the optical fiber laser adjusted based on spectrum of the present invention；
Fig. 2 is pulse width of the optical fiber laser based on spectrum regulation of the present invention under the length of different prechirp optical fiber
The curve chart of degree, spectral width and shg efficiency, wherein（a）It is that pulse width and spectral width become with the length of prechirp optical fiber
The curve chart of change,（b）For shg efficiency with the length change of prechirp optical fiber curve chart；
Fig. 3 is the autocorrelator trace figure of the femtosecond pulse of the optical fiber laser output adjusted based on spectrum of the present invention；
Fig. 4 is the spectrogram of the femtosecond pulse of the optical fiber laser output adjusted based on spectrum of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings, by embodiment, the present invention will be further described.
As shown in figure 1, the optical fiber laser adjusted based on spectrum of the present embodiment is included：Seed source 1, Erbium-doped fiber amplifier
Device 2, pulse compression system 3 and frequency multiplication filtering system 4；Wherein, erbium-doped fiber amplifier includes pumping source 21, bonder 22 and increases
Beneficial optical fiber 23；In the end of gain fibre 23, Polarization Controller 6 is set.
In Fig. 1,51 is fibre optic isolater, and length is 30mm；Gain fibre 23 is the Er-doped fiber of 220mm；From er-doped light
Pulse Jing single-mode fibers 52, fibre optic isolater 51, the collimator 71 of the output of fiber amplifier 2（A diameter of 3.8mm）, 1/4 slide 72
（Diameter 12.7mm）, 1/2 slide 73（Diameter 12.7mm）With square reflector 74（Size 20*20*2mm）Prism is propagated to 3；
31 is angle mirror；Frequency multiplication filtering system 4 includes successively 1/2 slide 41（Diameter 12.7mm）, convex lenss 42（Focal length f=35mm, diameter=
25.4mm）, frequency-doubling crystal 43（Commercial lithium niobate frequency doubler crystal）, convex lenss 44（Focal length=40mm, diameter=25.4mm）And filtering
Piece 45（Diameter=25.4mm）.
Seed source 1 is to obtain repetition rate for 80MHz using nonlinear polarization rotation locked mode NPR principles, and mean power is
5mW Er-doped fiber mode-locked lasers, export pulse through one section of prechirp optical fiber 5, using single-mode fiber, there is provided negative dispersion, after
In injection erbium-doped fiber amplifier, erbium-doped fiber amplifier 2 is using four 974nm diodes as the two directional pump of pumping source 21
Mode pumping, obtains the 1550nm femtosecond pulses of 407mW after amplification, and by Er-doped fiber gain fibre 23 is used as
In Polarization Controller 6 adjust the degree of polarization of output pulse so that the power of the pulse of output prism pair is maximum, that is, be lost most
It is little；Then the pulse compression system 3 through the prism pair using silicon materials is compressed to pulse, eventually passes and focuses on commercialization
Lithium niobate frequency doubler crystal obtains the femtosecond pulse near 800nm.By the length for adjusting prechirp optical fiber 5, it is possible to obtain
The spectral width and pulse width of fundamental frequency light 1550nm femtosecond pulse after different amplification and compression, the two indexs are also for again
Frequency efficiency produces tremendous influence.
Pulse width and spectral width with prechirp optical fiber length change such as Fig. 2（a）It is shown, wherein, curve a is pulse
Width with the length change of prechirp optical fiber curve, curve b be spectral width with the length change of prechirp optical fiber curve；
Shg efficiency with prechirp optical fiber length change such as Fig. 2（b）It is shown.The 800nm that finally obtains nearby femtosecond pulse from phase
Curve is closed as shown in figure 3, the spectrum of femtosecond pulse is as shown in Figure 4.
The implementation method of the optical fiber laser adjusted based on spectrum of the present embodiment, is comprised the following steps：
1）The length range of design prechirp optical fiber adjusts spacing to adjust spacing 1m between 2～5 meters；
2）The length of adjustment prechirp optical fiber, seed source output pulse, is connected to Er-doped fiber and puts by prechirp optical fiber
Big device obtains the 1550nm femtosecond pulses of 407mW after amplifying, by the Polarization Controller in gain fibre output is adjusted
The degree of polarization of pulse, reduces loss of the prism to causing to pulsed light reflection, exports to pulse compression system after amplification；
3）Measure spectrum width, and measure compression after pulse width, adjust prism to the distance between so that compression
Pulse width afterwards is minimum；
4）Transmit after pulse compression to frequency multiplication filtering system, measurement obtains shg efficiency；
5）Increase the length of prechirp optical fiber, repeat step 2 according to spacing is adjusted）～4）, until the length of prechirp optical fiber
Till point in the range of degree is all finished, into step 6）
6）Obtain curve chart of the shg efficiency with the length change of prechirp optical fiber, such as Fig. 2（b）It is shown, find frequency multiplication effect
Rate highest point is 3m, so as to be set to the length of prechirp optical fiber for 3m, the shg efficiency highest of optical fiber laser.
It is finally noted that, the purpose for publicizing and implementing mode is that help further understands the present invention, but ability
The technical staff in domain is appreciated that：Without departing from the spirit and scope of the invention and the appended claims, it is various replacement and
Modification is all possible.Therefore, the present invention should not be limited to embodiment disclosure of that, the scope of protection of present invention with
The scope that claims are defined is defined.
Claims (1)
1. it is a kind of based on spectrum adjust optical fiber laser implementation method, it is characterised in that the implementation method include it is following
Step：
1) according to actual needs, design the length range of prechirp optical fiber and adjust spacing；
2) length of prechirp optical fiber, seed source output pulse, pulse Jing prechirps optical fiber, Erbium-doped fiber amplifier successively are adjusted
Device, single-mode fiber, fibre optic isolater, collimator, 1/4 slide, 1/2 slide, square reflector and prism are transmitted to frequency multiplication to after
Filtering system, is connected to erbium-doped fiber amplifier and amplifies by prechirp optical fiber, is adjusted by the Polarization Controller in gain fibre
The degree of polarization of section output pulse, it is defeated after amplification to reduce loss of the prism of pulse compression system to causing to pulsed light reflection
Go out to pulse compression system；
3) measure spectrum width, and measure compression after pulse width, adjust prism to the distance between so that after compression
Pulse width is minimum；
4) transmit after pulse compression to frequency multiplication filtering system, obtain the femtosecond pulse of frequency multiplication, measurement obtains shg efficiency；
5) according to the length for adjusting spacing increase prechirp optical fiber, repeat step 2)～4), until the length in prechirp optical fiber
In the range of point all finish till, into step 6)；
6) curve chart of the shg efficiency with the length change of prechirp optical fiber is obtained, shg efficiency highest point is found, with this point
It is set to the length of prechirp optical fiber.
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| CN201410006142.9A CN103715591B (en) | 2014-01-07 | 2014-01-07 | Optical fiber laser device based on spectrum adjustment and implementation method of optical fiber laser device |
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| CN201410006142.9A CN103715591B (en) | 2014-01-07 | 2014-01-07 | Optical fiber laser device based on spectrum adjustment and implementation method of optical fiber laser device |
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| CN103715591B true CN103715591B (en) | 2017-05-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105181155B (en) * | 2015-10-19 | 2018-03-27 | 南开大学 | Terahertz pulse single detection system and detection method based on single-mode fiber |
| CN107069391B (en) * | 2017-02-10 | 2020-07-17 | 北京大学 | Femtosecond pulse laser modulator and miniature two-photon microscopic imaging device with same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7782912B2 (en) * | 2004-12-07 | 2010-08-24 | Imra America, Inc. | Yb: and Nd: mode-locked oscillators and fiber systems incorporated in solid-state short pulse laser systems |
| CN102801095A (en) * | 2011-05-20 | 2012-11-28 | 以卡尔马激光名义经营的卡尔马光通信公司 | Generating laser pulses of narrow spectral linewidth based on chirping and stretching of laser pulses and subsequent power amplification |
| CN103001106A (en) * | 2012-11-23 | 2013-03-27 | 广东汉唐量子光电科技有限公司 | High power optical fiber laser amplifier capable of achieving stable control of polarization precompensation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7782912B2 (en) * | 2004-12-07 | 2010-08-24 | Imra America, Inc. | Yb: and Nd: mode-locked oscillators and fiber systems incorporated in solid-state short pulse laser systems |
| CN102801095A (en) * | 2011-05-20 | 2012-11-28 | 以卡尔马激光名义经营的卡尔马光通信公司 | Generating laser pulses of narrow spectral linewidth based on chirping and stretching of laser pulses and subsequent power amplification |
| CN103001106A (en) * | 2012-11-23 | 2013-03-27 | 广东汉唐量子光电科技有限公司 | High power optical fiber laser amplifier capable of achieving stable control of polarization precompensation |
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