CN103647206A - All-fiber mode-locked laser with high repetition frequency - Google Patents
All-fiber mode-locked laser with high repetition frequency Download PDFInfo
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- CN103647206A CN103647206A CN201310550441.4A CN201310550441A CN103647206A CN 103647206 A CN103647206 A CN 103647206A CN 201310550441 A CN201310550441 A CN 201310550441A CN 103647206 A CN103647206 A CN 103647206A
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Abstract
The invention discloses all-fiber mode-locked laser with high repetition frequency, which comprises a laser pump source, an integrated optical device, a high-gain optical fiber and a polarization rotary optical fiber, wherein the laser pump source is connected with a pump input end of the integrated optical device, a common end of the integrated optical device, the high-gain optical fiber, the polarization rotary optical fiber and a signal input end of the integrated optical device are connected in sequence to form a loop and make up an optical resonant cavity; the output end of the integrated optical device acts as signal output of the laser; a core of the high-gain optical fiber is doped with high-concentration luminous ions, the luminous ions is one or a combination of lanthanide ions and transition metal ions, the per unit length gain of the optical fiber is greater than 1dB/cm, and the length is less than 10cm. The all-fiber mode-locked laser with the high repetition frequency greatly shortens the cavity length of laser, and can realize ultrashort laser pulse output with the laser repetition frequency being greater than 500MHz. The laser disclosed by the invention has the all-fiber structure, and is simple and compact in structure.
Description
Technical field
The present invention relates to ultra-short pulse laser field, be specifically related to the full optical fiber mode locked laser of high repetition frequency.
Background technology
High pulse repetition frequency ultra-short pulse laser device has very important application in fields such as high-speed light sampling, biomedicine, accurate distance measurement and optical frequency coms, is the focus of current laser field research.The implementation of high repetition rate mode-locked lasers fiber laser has a variety of.By initiatively or passive harmonic mode locking can realize easily high repetitive frequency pulsed output, but general less stable, and the pulse train of output has larger time jitter, is unfavorable for practical application.Utilize semiconductor saturable absorber, Graphene or carbon nano-tube etc. as locked mode device, also can realize the pulse output of repetition rate; but this laser is limited to locked mode mechanism; the spectrum of general output is narrower, and Pulse width comparision is wide, can not meet the requirement of application.Based on nonlinear polarization rotation locked mode mechanism, can obtain shorter pulse output, and structure is relatively simple.
High repetition rate is corresponding to short cavity length, in circular cavity optic fibre laser, resonant cavity contains wavelength division multiplexer, the multiple device such as optical isolator and beam splitter, each device itself has certain package length, the tail optical fiber that also will retain certain length for optical-fiber type device carries out welding, and in chamber, needs the gain fibre of certain length that enough gains are provided.These effects limit the repetition rate of laser, be generally not more than 300 MHz.
With body member replacement optical-fiber type device, can reduce the length of device in resonant cavity, be conducive to improve the repetition rate of laser.But the introducing of body member, has destroyed all optical fibre structure of fiber laser, and has needed accurate collimation, make the structure of laser become complicated, Space Coupling has increased the unsteadiness of system simultaneously.
Locked mode mechanism based on nonlinear polarization rotation; the people such as Michal Nikodem have reported a kind of full optical fiber laser with active-passive lock mould in 2010; repetition rate 169 MHz(are referring to Opt. Commun.; 2010; 283:109-112); in chamber, use common optical-fiber type device and the longer quartzy gain fibre of commercialization, be difficult to the further chamber of shortening long, improved repetition rate.
Therefore, the realization of high repetition frequency all optical fiber ring cavity mode-locked laser needs new technical scheme.
Summary of the invention
The invention provides the full optical fiber mode locked laser of high repetition frequency, the technical problem that will solve be: keeping on the basis of all optical fibre structure, the chamber of shortening annular cavity optical fibre laser is long effectively, obtains the ultra-short pulse laser output that repetition rate is greater than 500 MHz, and concrete technical scheme is as follows.
The full optical fiber mode locked laser of high repetition frequency, comprise laser pumping source, integrated optical device, high-gain optical fiber and polarization spin fiber, laser pumping source is connected with the pumping input of integrated optical device, the signal input part of the common port of integrated optical device, high-gain optical fiber, polarization spin fiber and integrated optical device is connected in turn, forms loop and forms optical resonator; The output of integrated optical device is as the signal output of laser; The light emitting ionic of the fibre core doped with high concentration of described high-gain optical fiber, light emitting ionic is one or more assembly in lanthanide ion, transition metal ions, and the gain of optical fiber unit length is greater than 1 dB/cm, and length is less than 10 cm; Described high repetition frequency is greater than 500 MHz.
Further, described integrated optical device is integrated wavelength division multiplexer, optical isolator and beam splitter, length is less than 10 cm.
Further, described polarization spin fiber, for the polarization state of flashlight in modulated optical resonant cavity, is that optical fiber heating is reversed to set angle along shaft axis of optic fibre, and cooling curing keeps the optical fiber of windup-degree, and length is less than 10 cm.
Further, described lanthanide ion is Er
3+, Yb
3+, Tm
3+, Gd
3+, Tb
3+, Dy
3+, Ho
3+or Lu
3+in one or more assembly.
Further, described transition metal ions is Cu
2+, Co
2+, Cr
3+, Fe
2+or Mn
2+in one or more assembly.
The present invention can produce the ultrashort pulse that repetition rate is greater than 500 MHz, the process that this laser produces ultrashort pulse is: pump light is coupled in resonant cavity by the pumping input of integrated optical device, increase pump power, in resonant cavity, form laser generation, continue to increase pump power to threshold value, windup-degree by adjusting polarization spin fiber is to suitable value, make laser reach mode-lock status, in chamber, form ultrashort pulse, flashlight enters after the signal input part of integrated optical device by light splitting, and a part outputs to outside chamber.
Compared with prior art, technique effect of the present invention is:
The all optical fiber ring cavity mode-locked laser that the present invention proposes, adopts the monomode fiber of high-concentration dopant as gain fibre, and fiber gain coefficient is greater than 1 dB/cm, compares with common gain fibre, and the fiber lengths that provides identical gain to use is shorter.The integrated optical device that utilizes wavelength division multiplexer, optical isolator and beam splitter integrated has replaced conventional optical device, has reduced the length of laser cavity.Adopt polarization spin fiber to replace conventional Polarization Control device, further simplified the structure of laser.This technical scheme has been simplified the cavity configuration of mode-locked laser, and the chamber of greatly having shortened laser is long, has improved repetition rate, can realize repetition rate and be greater than 500 MHz.
Laser of the present invention has all optical fibre structure, can better resist external environment disturbance, and the stability of a system is stronger.Compare with other annular chamber mode-locked laser, structure is more simple compact.
Accompanying drawing explanation
Fig. 1 is the structural representation of the full optical fiber mode locked laser of the present invention, in figure: 1-laser pumping source, 2-integrated optical device, 3-high-gain optical fiber and 4-polarization spin fiber;
Fig. 2 is the spectrogram of the output light of the full optical fiber mode locked laser generation of the present invention;
Fig. 3 is the spectrogram of the output light of the full optical fiber mode locked laser generation of the present invention;
Fig. 4 is the autocorrelator trace of the full optical fiber mode locked laser output laser pulse of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, it should be noted that the scope of protection of present invention is not limited to the scope of embodiment statement.
As Fig. 1, high repetition frequency all optical fiber ring cavity mode-locked laser comprises laser pumping source 1, integrated optical device 2, high-gain optical fiber 3 and polarization spin fiber 4.Pumping source 1 is connected with the pumping input of integrated optical device 2, the common port of integrated optical device 2 is connected with one end of high-gain optical fiber 3, the other end of high-gain optical fiber 3 is connected with polarization spin fiber 4, then is connected with the signal end of integrated optical device 2, has formed optical resonator.The output of integrated optical device 2 is as the signal output of laser.
The single mode semiconductor laser of 980 nm is as laser pumping source 1 in the present embodiment.
Integrated wavelength division multiplexer in integrated optical device 2, optical isolator and beam splitter (inner annexation can with reference to prior art), wherein optical isolator is polarization relationship type optical isolator, the output ratio of beam splitter is 2 %.Integrated optical device 2 is tubulose encapsulation, package length 5.5 cm.
High-gain optical fiber 3 is rare earth doping phosphoric acid salt glass monomode fibers, and it is as the gain media of fiber laser, and in this example, selecting length is 4.5 cm.In the fibre core of high-gain optical fiber 3, the light emitting ionic of doped with high concentration is erbium and ytterbium, and the doping content of erbium, erbium/ytterbium rare earth ion is respectively 2.5 * 10
20ions/cm
3, 5.0 * 10
20ions/cm
3.Fibre core matrix components is phosphate glass, and fiber gain coefficient is greater than 5dB/cm.
The process that above-mentioned laser produces ultrashort pulse is:
Pump light incides the pumping input of integrated optical device, common port through integrated optical device incides in gain fibre, increase pump power, in resonant cavity, form laser generation, continue to increase pump power to threshold value, the windup-degree by adjusting polarization spin fiber is to suitable value, make laser reach mode-lock status, in chamber, form ultrashort pulse, flashlight enters after the signal input part of integrated optical device by light splitting, and a part outputs to outside chamber.Shown in the output pulse frequency spectrum and Fig. 2 observing, as shown in Figure 3, pulse autocorrelator trace as shown in Figure 4 for spectrum.
Claims (5)
1. the full optical fiber mode locked laser of high repetition frequency, comprise laser pumping source (1), characterized by further comprising integrated optical device (2), high-gain optical fiber (3) and polarization spin fiber (4), laser pumping source (1) is connected with the pumping input of integrated optical device (2), the common port of integrated optical device (2), high-gain optical fiber (3), polarization spin fiber (4) and the signal input part of integrated optical device (2) are connected in turn, form loop and form optical resonator; The output of integrated optical device (2) is as the signal output of laser; The light emitting ionic of the fibre core doped with high concentration of described high-gain optical fiber (3), light emitting ionic is one or more assembly in lanthanide ion, transition metal ions, and the gain of optical fiber unit length is greater than 1 dB/cm, and length is less than 10 cm; Described high repetition frequency is greater than 500 MHz.
2. the full optical fiber mode locked laser of high repetition frequency according to claim 1, is characterized in that: described integrated optical device (2) is integrated wavelength division multiplexer, optical isolator and beam splitter, length is less than 10 cm.
3. the full optical fiber mode locked laser of high repetition frequency according to claim 1, it is characterized in that: described polarization spin fiber (4) is for the polarization state of flashlight in modulated optical resonant cavity, that optical fiber heating is reversed to set angle along shaft axis of optic fibre, cooling curing keeps the optical fiber of windup-degree, and length is less than 10 cm.
4. the full optical fiber mode locked laser of high repetition frequency according to claim 1, is characterized in that: described lanthanide ion is Er
3+, Yb
3+, Tm
3+, Gd
3+, Tb
3+, Dy
3+, Ho
3+or Lu
3+in one or more assembly.
5. according to the full optical fiber mode locked laser of high repetition frequency described in claim 1 ~ 4 any one, it is characterized in that: described transition metal ions is Cu
2+, Co
2+, Cr
3+, Fe
2+or Mn
2+in one or more assembly.
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| CN201310550441.4A CN103647206A (en) | 2013-11-08 | 2013-11-08 | All-fiber mode-locked laser with high repetition frequency |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356206A (en) * | 2015-11-18 | 2016-02-24 | 华南理工大学 | Wide-temperature-adaptation-interval single frequency fiber laser |
| CN106654823A (en) * | 2015-10-14 | 2017-05-10 | 北京信息科技大学 | Mode-locking fiber laser system capable of switching wavelength through collimators |
| CN109449731A (en) * | 2018-09-20 | 2019-03-08 | 深圳市大德激光技术有限公司 | A kind of ultrafast pulse optical fiber laser |
| CN110474226A (en) * | 2019-07-30 | 2019-11-19 | 华南理工大学 | A kind of vortex light single frequency optical fiber laser |
| CN111342328A (en) * | 2020-03-03 | 2020-06-26 | 青岛自贸激光科技有限公司 | Ultrafast fiber laser |
Citations (4)
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| US20090052477A1 (en) * | 2004-04-12 | 2009-02-26 | Jian Liu | Nonlinear polarization pulse shaping mode locked fiber laser |
| JP2009516227A (en) * | 2005-11-18 | 2009-04-16 | オプティシンクス リミテッド | Optical comb frequency source |
| CN101826696A (en) * | 2009-03-02 | 2010-09-08 | 北京大学 | High-energy low-repetition-frequency fiber laser |
| CN102208739A (en) * | 2011-04-27 | 2011-10-05 | 北京工业大学 | High impulse energy cladding pumped ultrafast fiber laser |
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2013
- 2013-11-08 CN CN201310550441.4A patent/CN103647206A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| US20090052477A1 (en) * | 2004-04-12 | 2009-02-26 | Jian Liu | Nonlinear polarization pulse shaping mode locked fiber laser |
| JP2009516227A (en) * | 2005-11-18 | 2009-04-16 | オプティシンクス リミテッド | Optical comb frequency source |
| CN101826696A (en) * | 2009-03-02 | 2010-09-08 | 北京大学 | High-energy low-repetition-frequency fiber laser |
| CN102208739A (en) * | 2011-04-27 | 2011-10-05 | 北京工业大学 | High impulse energy cladding pumped ultrafast fiber laser |
Non-Patent Citations (1)
| Title |
|---|
| T.YANG ET AL.: "A Compact 500MHz Femtosecond All-Fiber Ring Laser", 《APPL. PHYS. EXPRESS》, vol. 6, no. 5, 22 April 2013 (2013-04-22) * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654823A (en) * | 2015-10-14 | 2017-05-10 | 北京信息科技大学 | Mode-locking fiber laser system capable of switching wavelength through collimators |
| CN105356206A (en) * | 2015-11-18 | 2016-02-24 | 华南理工大学 | Wide-temperature-adaptation-interval single frequency fiber laser |
| CN109449731A (en) * | 2018-09-20 | 2019-03-08 | 深圳市大德激光技术有限公司 | A kind of ultrafast pulse optical fiber laser |
| CN109449731B (en) * | 2018-09-20 | 2019-09-20 | 深圳市大德激光技术有限公司 | A kind of ultrafast pulse optical fiber laser |
| CN110474226A (en) * | 2019-07-30 | 2019-11-19 | 华南理工大学 | A kind of vortex light single frequency optical fiber laser |
| CN111342328A (en) * | 2020-03-03 | 2020-06-26 | 青岛自贸激光科技有限公司 | Ultrafast fiber laser |
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