CN104682174A - Figure-of-eight cavity and composite cavity structure-based passive mode-locked fiber laser - Google Patents
Figure-of-eight cavity and composite cavity structure-based passive mode-locked fiber laser Download PDFInfo
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- CN104682174A CN104682174A CN201410531438.2A CN201410531438A CN104682174A CN 104682174 A CN104682174 A CN 104682174A CN 201410531438 A CN201410531438 A CN 201410531438A CN 104682174 A CN104682174 A CN 104682174A
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Abstract
The invention discloses a figure-of-eight cavity and composite cavity structure-based passive mode-locked fiber laser, which is characterized in that a frequency-selecting structure is added into the traditional figure-of-eight cavity structure laser; in the figure, one port of a polarization controller 2 is connected with the common port k of a polarization beam splitter; another two ports of the polarization beam splitter are respectively connected with two polarization controllers 3 and 4; the other end of the polarization controller 3 and the other end of the polarization controller 4 are respectively connected with two sections of single mode fibers 1 and 2; the other end of the single mode fiber 1 and the other end of the single mode fiber 2 are respectively connected with the n port and the o port of a polarization beam combiner; the common port p of the polarization beam combiner is connected with the common port b of a wavelength division multiplexer; a formed closed loop circuit becomes a resonant cavity of the passive mode-locked fiber laser, and composite double cavities are jointly used for frequency selecting, so that the fundamental frequency of each cavity of the laser becomes large, and the pulse repetition rate becomes high. The passive mode-locked fiber laser disclosed by the invention has the advantages of being simple in structure, low cost, high in pulse repetition rate, narrow in pulse width, and the like, and can stably work at normal temperature.
Description
Technical field
The present invention relates to the technology of preparing of mode locked fiber laser, particularly a kind of passive mode-locking fiber laser based on 8 word chambeies and Compound Cavity structure.
Background technology
Mode locked fiber laser has important researching value in fields such as ultra-fast optical, nonlinear optics, Photobiology, optical information processing and laser processings.Enter the nineties, people have done large quantity research to the theory of mode-locked laser and experiment, propose brand-new design concept in theory, such as active mode locking, harmonic mode locking, rational number harmonic mode-locking, additional (or collision) are pulse mode-locked, a series of locked mode such as injecting lock mould, nonlinear optics environment locked mode, nonlinear polarization rotation locked mode, semiconductor saturable absorber locked mode is theoretical.
According to locked mode principle, mode locked fiber laser is divided into Active Mode-locked Fiber Laser and the large class of passive mode-locking fiber laser two.Passive mode-locking fiber laser technology is a kind of typical non-linear mode-locking technique of all-fiber.It allows in the chamber of laser does not exist any active modulator, but fiber laser still can realize the output of femtosecond pulse; Its principle is: in fiber laser, some nonlinear optical effects of general existence, the intensity of these optical effects is relevant with the peak value of the pulse run in chamber, a kind of correlation like this, allow each longitudinal mode PGC demodulation of laser inside, in this case, fiber laser just can the femtosecond pulse of stable output.
Summary of the invention
The object of the invention is for above-mentioned technical Analysis, provide that a kind of compact conformation, low cost, repetition rate are high, the passive mode-locking fiber laser based on 8 word chambeies and Compound Cavity structure of ultrashort pulse.
Technical scheme of the present invention:
A kind of passive mode-locking fiber laser based on 8 word chambeies and Compound Cavity structure, by 980nm pumping source, wavelength division multiplexer, Er-doped fiber, 50: 50 couplers, optical isolator, Polarization Controller, 20: 80 couplers, polarization beam apparatus, polarization beam combiner and monomode fiber composition, described 980nm pumping source is connected with one section of Er-doped fiber by a end of wavelength division multiplexer, the other end of Er-doped fiber is held with the d of 50: 50 couplers and is connected, 50: 50 coupler f ends are connected with the common port h of 20: 80 couplers, its 80% port i is connected with one end of Polarization Controller 1, other one end of Polarization Controller 1 is connected with the input of optical isolator, its output is connected with the g port of 50: 50 couplers, the e port of 50: 50 couplers is connected with Polarization Controller 2, the another one port of Polarization Controller 2 is held with the common port k of polarization beam splitting and is connected, two other port of polarization beam splitting connects two Polarization Controllers 3 and 4 respectively, Polarization Controller 3 with 4 other one end be connected with two section single-mould fibers 1 and 2 respectively, monomode fiber 1 with 2 the other end respectively at polarization coupling n end and o hold be connected, the common port p end of polarization beam combiner is held with the common port b of wavelength division multiplexer and is connected.
The closed-loop path formed becomes the resonant cavity of laser with active-passive lock mould, and the common frequency-selecting of compound two-chamber, make the chamber fundamental frequency of laser become 1GHz, the repetition rate of pulse becomes 1GHz.
Operation principle of the present invention:
This passive mode-locking fiber laser utilizes 8 word chambeies to realize passive mode locking, produces ultrashort pulse.The light of spontaneous radiation is produced by pumping source pump erbium-doped optical fiber amplifier, after arrival linear loop circulates one week, by 50: 50 couplers enter right side nonlinear optical fiber magnifying glass the physical process that experiences of two-beam not identical: 50: 50 coupling apparatus of 8-shaped fiber laser central authorities, initial incident field is divided into two parts amplitude identical, but the contrary light field in the direction of propagation, namely by Erbium-doped fiber amplifier time this structure makes a road light field just enter loop, but another road light field but could can only be exaggerated when leaving, therefore this two-way light field is subject to different nonlinear phase shift in the process of fiber laser internal transmission, and the phase difference between them is not different, usually we can regulate the gain of semiconductor optical amplifier or Polarization Controller to make peak value of pulse part, two-part phase shift difference is that π is so when this part energy just can be transmitted through coupler, and pulse both sides place due to energy comparison low, so the Phasor comparison of accumulation is few, thus reflected, last result is, peak value of pulse energy is more and more higher, and pulse both sides place energy is more and more lower, thus generation saturable absorption effect is gone round and begun again, the femtosecond pulse of fiber laser just stable output, the common frequency-selecting of compound two-chamber, the repetition rate of pulse is uprised.We are monitored by oscilloscope and spectrometer many locked modes result by 20% port of 20: 80 optical couplers.
Advantage of the present invention is: this passive mode-locking fiber laser has the advantages such as structure is simple, cost is low, pulse repetition frequency is high, pulse is narrow, can steady operation at normal temperatures.
Accompanying drawing explanation
Accompanying drawing is this passive mode-locking fiber laser based on nonlinear optical fiber magnifying glass.
In figure: 1.980nm pumping source 2. wavelength division multiplexer 3. Er-doped fiber 4.50: 50 coupler 5. optical isolator 6. Polarization Controller 2 7.20: 80 coupler 8. Polarization Controller 2 9. polarization beam apparatus 10. Polarization Controller 3 11. Polarization Controller 4 12. monomode fiber 113. monomode fiber 2 14. polarization beam combiner
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment:
A kind of passive mode-locking fiber laser based on 8 word chambeies and Compound Cavity structure, by 980nm pumping source, wavelength division multiplexer, Er-doped fiber, 50: 50 couplers, optical isolator, Polarization Controller, 20: 80 couplers, polarization beam apparatus, polarization beam combiner and monomode fiber composition, described 980nm pumping source is connected with one section of Er-doped fiber by a end of wavelength division multiplexer, the other end of Er-doped fiber is held with the d of 50: 50 couplers and is connected, 50: 50 coupler f ends are connected with the common port h of 20: 80 couplers, its 80% port i is connected with one end of Polarization Controller 1, other one end of Polarization Controller 1 is connected with the input of optical isolator, its output is connected with the g port of 50: 50 couplers, the e port of 50: 50 couplers is connected with Polarization Controller 2, the another one port of Polarization Controller 2 is held with the common port k of polarization beam splitting and is connected, two other port of polarization beam splitting connects two Polarization Controllers 3 and 4 respectively, Polarization Controller 3 with 4 other one end be connected with two section single-mould fibers 1 and 2 respectively, monomode fiber 1 with 2 the other end respectively at polarization coupling n end and o hold be connected, the common port p end of polarization beam combiner is held with the common port b of wavelength division multiplexer and is connected.
The closed-loop path formed becomes the resonant cavity of laser with active-passive lock mould, and the common frequency-selecting of compound two-chamber, make the chamber fundamental frequency of laser become 1GHz, the repetition rate of pulse becomes 1GHz.
In this embodiment, 980nm pumping source is self-control, and Er-doped fiber length is about 10 meters; Single-mode optical fiber length that Polarization Controller is wound around is 3 meters; The model of polarization beam apparatus and polarization beam combiner is PBS-1550-APC, and the model of optical isolator is IO-H-1550; The model of 50: 50 optical couplers is SC-155050/50-0; The model of 20: 80 optical couplers is: the monomode fiber in SC-1550-20/80-0 compound two-chamber divides several kilometers of different length.
8 word chambeies should be utilized to realize passive mode locking based on the passive mode-locking fiber laser in 8 word chambeies, produce ultrashort pulse.The light of spontaneous radiation is produced by the erbium-doped fiber amplifier without threshold value, after the equivalent saturable absorption of nonlinear optical fiber magnifying glass, the place that pulse amplitude is large is reflected, and the relatively little place of amplitude is absorbed, last result is, peak value of pulse energy is more and more higher, and pulse both sides place energy is more and more lower, goes round and begins again, the femtosecond pulse of fiber laser just stable output, after adding Compound Cavity, according to Wiener ergodic theorem, pulse repetition frequency significantly improves.Mode locking pulse and its spectrum are monitored from the b port of polarization beam apparatus by oscilloscope and spectrometer.
This passive mode-locking fiber laser has important researching value and application in fields such as ultra-fast optical, nonlinear optics, optical fiber communication, Photobiology, optical information processing and laser processings.
Claims (1)
1. the passive mode-locking fiber laser based on 8 word chambeies and Compound Cavity structure, by 980nm pumping source, wavelength division multiplexer, Er-doped fiber, 50: 50 couplers, optical isolator, Polarization Controller, 20: 80 couplers, polarization beam apparatus, polarization beam combiner and monomode fiber composition, it is characterized in that: described 980nm pumping source is connected with one section of Er-doped fiber by (a) end of wavelength division multiplexer, the other end of Er-doped fiber is held with (d) of 50: 50 couplers and is connected, 50: 50 coupler (f) ends are connected with the common port (h) of 20: 80 couplers, its 80% port (i) is connected with one end of Polarization Controller (1), other one end of Polarization Controller (1) is connected with the input of optical isolator, its output is connected with (g) port of 50: 50 couplers, (e) port of 50: 50 couplers is connected with Polarization Controller (2), the another one port of Polarization Controller (2) is held with the common port (k) of polarization beam splitting and is connected, two other port of polarization beam splitting connects two Polarization Controllers (3) and (4) respectively, Polarization Controller (3) is connected with two section single-mould fibers (1) and (2) respectively with the other one end of (4), the other end of monomode fiber (1) and (2) is held respectively at (n) end of polarization coupling and (o) and is connected, common port (p) end of polarization beam combiner is held with the common port (b) of wavelength division multiplexer and is connected, the closed-loop path formed becomes the resonant cavity of laser with active-passive lock mould, and the common frequency-selecting of compound two-chamber, make the chamber fundamental frequency of laser become 1GHz, the repetition rate of pulse becomes 1GHz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767630A (en) * | 2018-09-03 | 2018-11-06 | 吉林大学 | A kind of laser pulse stretching system |
| CN110086078A (en) * | 2019-04-19 | 2019-08-02 | 北京盛镭科技有限公司 | Picosecond optical fiber seed laser |
-
2014
- 2014-09-30 CN CN201410531438.2A patent/CN104682174A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767630A (en) * | 2018-09-03 | 2018-11-06 | 吉林大学 | A kind of laser pulse stretching system |
| CN108767630B (en) * | 2018-09-03 | 2023-11-24 | 吉林大学 | Laser pulse widening system |
| CN110086078A (en) * | 2019-04-19 | 2019-08-02 | 北京盛镭科技有限公司 | Picosecond optical fiber seed laser |
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Application publication date: 20150603 |