CN1822450A - Single longitudinal mode single polarizing phase shift distribution feedback optic fiber laser and its producing method - Google Patents
Single longitudinal mode single polarizing phase shift distribution feedback optic fiber laser and its producing method Download PDFInfo
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- CN1822450A CN1822450A CN 200610024826 CN200610024826A CN1822450A CN 1822450 A CN1822450 A CN 1822450A CN 200610024826 CN200610024826 CN 200610024826 CN 200610024826 A CN200610024826 A CN 200610024826A CN 1822450 A CN1822450 A CN 1822450A
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Abstract
Present invention relates to a single polarization single longitudinal mode optical fiber phase shift distribution feedback laser and preparation method. It contains one wavelength division multiplexer whose one terminal connected with tail fiber, the wave coupling terminal connected with one end with ytterbium doped optical fiber having phase shift optical fiber raster, another terminal of said ytterbium doped optical fiber connected with first fiber optic isolater said wavelength division multiplexer reversal output port connected with second fibre optic isolater , said phase shift optical fiber raster set on aluminium sheet which is set on temperature controller, phase shift zone of said phase shift optical fiber raster having one pressure applying control mechanism. Said method can regulate laser output wavelength through stretching optical fiber raster or adjusting temperature. The output has single polarization, single longitudinal mode and high stability property.
Description
Technical field
The present invention relates to optical fiber phase shift distributed feedback laser, single longitudinal mode single polarizing optical fiber phase shift distributed feedback laser of particularly a kind of high stable by Stress Control and preparation method thereof.
Background technology
In the fiber laser field, optical fiber phase shift distributed feedback laser is because line width, the single longitudinal mode characteristic is good, be subjected to Temperature Influence little, obtain high-output power easily, low noise, the narrow linewidth of KHz and with characteristics such as optical fiber compatibility, than semiconductor distributed feedback laser bigger superiority is arranged in a lot of fields.
The making of optical fiber phase shift distributed feedback laser is inscribed phase-shifted fiber grating with ultraviolet light and is finished on doped fiber.At present, the ultraviolet light of inscription fiber grating commonly used is the excimer laser of 193nm and two kinds of wavelength of 248nm, still, in manufacturing process, finds that single polarization problem of optical fiber phase shift distributed feedback laser is difficult to control.Though adopt the polarised light of 248nm directly to inscribe fiber grating, photic birefringent phenomenon caused, thus can obtain the phase shift distribution feedback optic fiber laser of single polarization output.But, be not that all optical fiber all has good light sensitivity to 248nm, such as, simultaneously phosphorus-doped optical fiber is just very poor for the light sensitivity of the ultraviolet light of 248nm in the optical fiber, and only the ultraviolet light of 193nm is had good light sensitivity.In addition, accomplish the fiber grating of same high reflectivity, be the excimer laser of 193nm for the 248nm excimer laser than with wavelength with wavelength, needs the exposure of higher pulse energy or longer time.Like this, can reduce to make the life-span of the phase-plate of fiber grating greatly.But the wavelength of 193nm is difficult to find suitable Coating Materials to obtain the polarizer of high-polarization and high-transmission rate, therefore directly adopts the excimer laser of 193nm to make optical fiber phase shift distributed feedback laser, is difficult to obtain single polarization output.
Single polarization problem of present existing solution optical fiber phase shift distributed feedback laser, the way that has pair optical fiber phase shift distributed feedback laser to carry out certain distortion or employing self-injection locking obtains single polarization output of laser, but in practical operation, we find very difficulty of these method operations, and be difficult to maintain a long-term stability, should be used for saying for engineering, be unpractical.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, and optical fiber phase shift distributed feedback laser of a kind of single polarization single longitudinal mode and preparation method thereof is provided.The output laser of prepared optical fiber phase shift distributed feedback laser should have the characteristics of single polarization, single longitudinal mode and high stability.
Technical solution of the present invention is as follows:
A kind of single longitudinal mode single polarizing phase shift distributed feedback laser, its structure is: a wavelength division multiplexer, one port connects the tail optical fiber of pump laser, the ripple port that closes of this wavelength division multiplexer links to each other with an end of the Yb dosed optical fiber that has phase-shifted fiber grating, the another port of this Yb dosed optical fiber connects first fibre optic isolater, the inverse output terminal mouth of described wavelength division multiplexer connects second fibre optic isolater, described phase-shifted fiber grating is placed on the aluminium sheet, this aluminium sheet places on the temperature controller, and the controlling organization of exerting pressure is arranged on the phase-shifted region of this phase-shifted fiber grating.
Described controlling organization of exerting pressure is to place a rubber to cover an aluminium flake again on the phase-shifted region of described phase-shifted fiber grating, aluminium flake each side establish a hole, utilize screw to penetrate described hole and described phase-shifted fiber grating and aluminium sheet are fixed and exerted pressure.
Described optical fiber is Yb dosed optical fiber or er-doped gain fibre.
Described pump laser is that optical maser wavelength is the semiconductor laser of 980nm.
The manufacture method of described single longitudinal mode single polarizing phase shift distributed feedback laser, at first utilize and block legal system and make the phase shift distributed feedback laser, by the phase-shifted region stress application being obtained single polarization single-longitudinal mode optical fiber phase shift distributed feedback laser, specifically may further comprise the steps then:
1. get a Yb dosed optical fiber or er-doped gain fibre, adopt the method for blocking to utilize the 193nm excimer laser to make phase-shifted fiber grating earlier;
2. will have forward output termination second isolator of the optical fiber of phase-shifted fiber grating, the inverse output terminal of this optical fiber connects watch-dog (9) through wavelength division multiplexer, first isolator, F-P interferometer; The input termination one described pump laser of described wavelength division multiplexer;
3. described phase-shifted fiber grating is placed on the aluminium sheet, on the phase-shifted region of this phase-shifted fiber grating, place a rubber and cover an aluminium flake again, each side establish a hole at aluminium flake, utilize screw to penetrate described hole described phase-shifted fiber grating and aluminium sheet are fixed, this aluminium sheet places on the thermostat;
4. open pump laser, the interference ring of observation on the monitor tunes the phase-shifted region stress application of screw to phase-shifted fiber grating then, when interference ring has only a collar till, at this moment laser is output as the output of single longitudinal mode single polarizing laser.
The described method of blocking promptly when making fiber grating, shelters from the part of the wavelength of irradiation fiber grating at the ultraviolet light of 193nm, makes when whole one section optical fiber is subjected to uv-exposure, has sub-fraction optical fiber not to be subjected to ultraviolet light induced index modulation.
Described to the phase-shifted region stress application, promptly at the phase-shifted region part stress application of optical fiber phase shift distributed feedback laser.Specific practice is to be placed on the aluminium sheet at the phase-shifted fiber grating that method that employing is blocked is made, and aluminium sheet is placed on the thermostat, is used for guaranteeing that the fiber distribution feedback laser is operated under the constant temperature.Place a rubber at the phase-shifted region of fiber grating then, the purpose of placing rubber is to prevent that metal directly is pressed on the optical fiber and optical fiber is ruptured easily.On as skin, place a sheet metal more then, on sheet metal, open two holes, by screw sheet metal is fixed on the aluminium sheet of placing fiber grating then.Like this, sheet metal has just produced a stress by rubber to the phase-shifted region of fiber grating, then by screwing the degree of screw, controls the size to the stress of the phase-shifted region of fiber grating.
Technique effect of the present invention
1, experimental result shows, adopts stress, can make the phase shift distributed feedback laser obtain stable single longitudinal mode single polarizing output.Stability, behind the output process acousto-optic chopper of laser, peak-to-peak fluctuating rms value can reach 0.8% in 20 minutes, and degree of polarization can reach 27dB.
2, experimental implementation is simple and convenient, and can come to carry out tuning to the output wavelength of fiber laser by stretching optical fiber grating or tuning temperature.
Description of drawings
Fig. 1 is a structure diagram of the present invention
Fig. 2 is to fiber grating stress application part and is placed on temperature control schematic diagram partly.
Fig. 3 is that fixedly F-P interferometer, the single longitudinal mode interference pattern that obtains are passed through in the output of mixing Yb fiber distribution feedback laser that utilizes the present invention to make on monitor.
Among the figure:
1-pump laser 2-wavelength division multiplexer 3-Yb dosed optical fiber
4-aluminium flake 5-picture skin 6-phase-shifted fiber grating
The 7-second fibre optic isolater 8-F-P interferometer 9-monitor
10-aluminium sheet 11-temperature controller 12-aluminium flake 13-screw
14-first fibre optic isolater
Embodiment
See also Fig. 1 earlier, Fig. 1 is the device sketch of the single polarization single longitudinal mode of the present invention phase shift distributed feedback laser.The manufacture method of the single polarization single longitudinal mode of the present invention phase shift distributed feedback laser is characterized in that specifically may further comprise the steps:
1, utilizes the method for blocking to mix earlier and make phase-shifted fiber grating 6 on the Yb optical fiber 3 at one section;
2, the phase-shifted fiber grating of making 6 is placed in 120 ℃ the baking box and anneals;
3, the phase-shifted fiber grating 6 after will annealing is placed on the aluminium sheet 10;
4, phase-shifted fiber grating 6 and aluminium sheet 10 are placed on above the temperature control 11;
5, place a rubber 5 on the phase-shifted region of fiber grating, an aluminium flake 12 is placed in the top of rubber 5, makes a call to two holes about aluminium flake 12 respectively, with screw 13 aluminium flake 12 is linked to each other with aluminium sheet 10 then.The phase-shifted region of fiber grating is pushed down by aluminium flake 12 by rubber 5;
6, with pump laser 1 by wavelength division multiplexer 2 pumping optical fibers 3 and be produced on phase-shifted fiber grating 6 on the optical fiber 3;
7, the inverse output terminal of the forward output of optical fiber 3 and wavelength division multiplexer 2 connects second fibre optic isolater 7.
8, the inverse output terminal at wavelength division multiplexer 2 passes through second fibre optic isolater 7, and warp is F-P interferometer 8 fixedly, by the operation conditions of monitor 9 observation zlasing modes;
9, tighten screw 13 on the sheet metal 12 and come phase-shifted region stress application phase-shifted fiber grating 6, when tightening screw 13, by the fixing output mode situation of F-P interferometer 8 and monitor 9 monitoring laser devices, when having only a cover interference ring, screw 13 stops the rotation this moment.At this moment the laser of laser is output as single longitudinal mode single polarizing.
The power output of pump light is 100mW.We adopt the spatial light power meter to test
The power out-put characteristic of this fiber laser, when pump power is 100mW, laser
Power output be 8.3mW, when the pump power of laser is 254mW, laser
The power output of device is 37.1mW.
With the polarization characteristic of Glan prism testing laser device, the degree of polarization of laser is 27dB.
Claims (5)
1, a kind of single longitudinal mode single polarizing phase shift distributed feedback laser, be characterised in that its structure is: a wavelength division multiplexer (2), one port connects the tail optical fiber of pump laser (1), the ripple port that closes of this wavelength division multiplexer (2) links to each other with an end of the Yb dosed optical fiber that has doping phase-shifted fiber grating (6) (3), the another port of this Yb dosed optical fiber (3) connects first fibre optic isolater (14), the inverse output terminal mouth of described wavelength division multiplexer (2) connects second fibre optic isolater, described doping phase-shifted fiber grating (6) is placed on the aluminium sheet (10), this aluminium sheet (10) places on the temperature controller (11), on the phase-shifted region of this phase-shifted fiber grating (6) controlling organization of exerting pressure is arranged.
2, single longitudinal mode single polarizing phase shift distributed feedback laser according to claim 1, it is characterized in that described controlling organization of exerting pressure is to place a rubber (5) to cover an aluminium flake (12) again on the phase-shifted region of described phase-shifted fiber grating (6), aluminium flake (12) each side establish a hole, it is fixing and exert pressure with described phase-shifted fiber grating (6) and aluminium sheet (10) to utilize screw (13) to penetrate described hole.
3,, it is characterized in that described optical fiber (3) is Yb dosed optical fiber or er-doped gain fibre according to claims 1 described single longitudinal mode single polarizing phase shift distributed feedback laser.
4,, it is characterized in that described pump laser (1) is that optical maser wavelength is the semiconductor laser of 980nm according to claims 1 described single longitudinal mode single polarizing phase shift distributed feedback laser.
5, the manufacture method of the described single longitudinal mode single polarizing phase shift of claim 1 distributed feedback laser is characterized in that may further comprise the steps:
1. get an optical fiber (3), adopt the method for blocking to utilize the 193nm excimer laser to make phase-shifted fiber grating (6) earlier;
Forward output termination second fibre optic isolater (14) that 2. will have the optical fiber (3) of phase-shifted fiber grating (6), the inverse output terminal of this optical fiber (3) connects watch-dog (9) through wavelength division multiplexer (2), first fibre optic isolater (7), F-P interferometer (8), input termination one pump laser (1) of described wavelength division multiplexer (2);
3. described phase-shifted fiber grating (6) is placed on the aluminium sheet (10), on the phase-shifted region of this phase-shifted fiber grating (6), place a rubber (5) and cover an aluminium flake (12) again, each side establish a hole at aluminium flake (12), it is fixing with described phase-shifted fiber grating (6) and aluminium sheet (10) to utilize screw (13) to penetrate described hole, and this aluminium sheet (10) places on the thermostat (11):
4. open pump laser (1), interference ring on the observation monitor (9), tune the phase-shifted region stress application of screw (13) then to phase-shifted fiber grating (6), when interference ring has only a collar till, at this moment laser is output as single longitudinal mode single polarizing laser output.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728752B (en) * | 2008-10-22 | 2011-06-01 | 中国科学院半导体研究所 | Wavelength tunable fiber laser |
| CN102349203A (en) * | 2010-01-12 | 2012-02-08 | 松下电器产业株式会社 | Laser source, wavelength-tunable laser source, and image display device |
| WO2019183749A1 (en) * | 2018-03-26 | 2019-10-03 | 深圳大学 | Single polarization fiber laser, preparation device thereof, and preparation method therefor |
| CN113131325A (en) * | 2021-04-16 | 2021-07-16 | 山东省科学院激光研究所 | Active Q-switching distributed feedback fiber laser |
| CN113937601A (en) * | 2021-09-14 | 2022-01-14 | 华中科技大学 | Single polarization state and single longitudinal mode optical fiber laser |
-
2006
- 2006-03-17 CN CN 200610024826 patent/CN1822450A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728752B (en) * | 2008-10-22 | 2011-06-01 | 中国科学院半导体研究所 | Wavelength tunable fiber laser |
| CN102349203A (en) * | 2010-01-12 | 2012-02-08 | 松下电器产业株式会社 | Laser source, wavelength-tunable laser source, and image display device |
| WO2019183749A1 (en) * | 2018-03-26 | 2019-10-03 | 深圳大学 | Single polarization fiber laser, preparation device thereof, and preparation method therefor |
| CN113131325A (en) * | 2021-04-16 | 2021-07-16 | 山东省科学院激光研究所 | Active Q-switching distributed feedback fiber laser |
| CN113937601A (en) * | 2021-09-14 | 2022-01-14 | 华中科技大学 | Single polarization state and single longitudinal mode optical fiber laser |
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