CN104682175A - Figure-of-eight cavity and silicon-based microannulus structure-based passive mode-locked fiber laser - Google Patents
Figure-of-eight cavity and silicon-based microannulus structure-based passive mode-locked fiber laser Download PDFInfo
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- CN104682175A CN104682175A CN201410531439.7A CN201410531439A CN104682175A CN 104682175 A CN104682175 A CN 104682175A CN 201410531439 A CN201410531439 A CN 201410531439A CN 104682175 A CN104682175 A CN 104682175A
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Abstract
The invention discloses a figure-of-eight cavity and silicon-based microannulus structure-based passive mode-locked fiber laser, which is characterized in that a frequency-selecting device is added on the basis of the traditional figure-of-eight cavity structure; one port of a polarization controller 2 is connected with a silicon-based microannulus; a formed closed loop circuit formed by connecting the other end of the silicon-based microannulus with the b port of a wavelength division multiplexer 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 silicon-based micro ring 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 silicon-based micro ring structure of ultrashort pulse.
Technical scheme of the present invention:
A kind of passive mode-locking fiber laser based on 8 word chambeies and silicon-based micro ring 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, one section of its 80% port i and Polarization Controller 1 is connected, 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 silicon-based micro ring of Polarization Controller 2 connects, the other end of silicon-based micro ring and the b of wavelength division multiplexer hold the closed-loop path be connected to form to become the resonant cavity of laser with active-passive lock mould, the common frequency-selecting of compound two-chamber, the chamber fundamental frequency of laser is made to fade to more than 1GHz, the repetition rate of pulse is increased to more than 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, reach to left side after 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 produce saturable absorption effect, go round and begin again, the femtosecond pulse of fiber laser just stable output, laser main resonance cavity and the common frequency-selecting of silicon-based micro ring, the repetition rate of pulse is uprised.We are monitored locked mode result by oscilloscope and spectrometer 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. silicon-based micro ring
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 silicon-based micro ring 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, one section of its 80% port i and Polarization Controller 1 is connected, 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 silicon-based micro ring of Polarization Controller 2 connects, the other end of silicon-based micro ring and the b of wavelength division multiplexer hold the closed-loop path be connected to form to become the resonant cavity of laser with active-passive lock mould, the common frequency-selecting of compound two-chamber, the chamber fundamental frequency of laser is made to fade to more than 1GHz, the repetition rate of pulse is increased to more than 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 optical isolator is IO-H-1550; The model of 50: 50 optical couplers is SC-1550 50/50-0; The model of 20: 80 optical couplers is: SC-1550-20/80-0, and silicon-based micro ring is self-control, and radius is 10 microns.
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 silicon-based micro ring, 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 silicon-based micro ring 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, one section of its 80% port (i) and Polarization Controller (1) is connected, 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 silicon-based micro ring of Polarization Controller (2) connects, the other end of silicon-based micro ring and (b) of wavelength division multiplexer hold the closed-loop path be connected to form to become the resonant cavity of laser with active-passive lock mould, the common frequency-selecting of compound two-chamber, the chamber fundamental frequency of laser is made to fade to more than 1GHz, the repetition rate of pulse is increased to more than 1GHz.
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| CN201410531439.7A CN104682175A (en) | 2014-09-30 | 2014-09-30 | Figure-of-eight cavity and silicon-based microannulus structure-based passive mode-locked fiber laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2605639C1 (en) * | 2015-06-30 | 2016-12-27 | Общество с ограниченной ответственностью "НАУЧНО-ТЕХНИЧЕСКОЕ ОБЪЕДИНЕНИЕ "ИРЭ-Полюс" (ООО НТО "ИРЭ-Полюс") | Method and devise for stabilizing optical power and spectral composition of radiation of fibre laser of ultrashort pulses |
| CN109217972A (en) * | 2018-11-05 | 2019-01-15 | 北京邮电大学 | It is a kind of based on silicon substrate mode conversion on piece lack mould laser generation system and method |
| CN110448271A (en) * | 2018-12-28 | 2019-11-15 | 中国科学院宁波工业技术研究院慈溪生物医学工程研究所 | θ chamber Fourier locks film swept light source system and OCT image system |
-
2014
- 2014-09-30 CN CN201410531439.7A patent/CN104682175A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2605639C1 (en) * | 2015-06-30 | 2016-12-27 | Общество с ограниченной ответственностью "НАУЧНО-ТЕХНИЧЕСКОЕ ОБЪЕДИНЕНИЕ "ИРЭ-Полюс" (ООО НТО "ИРЭ-Полюс") | Method and devise for stabilizing optical power and spectral composition of radiation of fibre laser of ultrashort pulses |
| CN109217972A (en) * | 2018-11-05 | 2019-01-15 | 北京邮电大学 | It is a kind of based on silicon substrate mode conversion on piece lack mould laser generation system and method |
| CN109217972B (en) * | 2018-11-05 | 2019-08-30 | 北京邮电大学 | It is a kind of based on silicon substrate mode conversion on piece lack mould laser generation system and method |
| CN110448271A (en) * | 2018-12-28 | 2019-11-15 | 中国科学院宁波工业技术研究院慈溪生物医学工程研究所 | θ chamber Fourier locks film swept light source system and OCT image system |
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Application publication date: 20150603 |