CN102185240A - High-power low-noise single-frequency optical fiber laser - Google Patents
High-power low-noise single-frequency optical fiber laser Download PDFInfo
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- CN102185240A CN102185240A CN 201110086540 CN201110086540A CN102185240A CN 102185240 A CN102185240 A CN 102185240A CN 201110086540 CN201110086540 CN 201110086540 CN 201110086540 A CN201110086540 A CN 201110086540A CN 102185240 A CN102185240 A CN 102185240A
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Abstract
The invention discloses a high-power low-noise single-frequency optical fiber laser, which comprises a semiconductor laser, an active phase shift optical grating, an optical isolator, an active optical fiber and a band-pass filter, wherein one end of the active phase shift optical grating is connected with the output end of the semiconductor laser; the optical isolator has wavelength selectivity; the input end of the optical isolator with wavelength selectivity is connected with the other end of the active phase shift optical grating; one end of the active optical fiber is connected with the output end of the optical isolator with wavelength selectivity; and the input end of the band-pass fiber with an optical isolation effect is connected with the other end of the active optical fiber.
Description
Technical field:
The present invention relates to the fiber laser field, particularly high-power low-noise single frequency optical fiber laser field.
Technical background
Fiber laser has narrow linewidth, and noise is low, and good beam quality with advantages such as optical fiber compatibilities, is widely used in optical measurement, optical fiber communication and sensory field of optic fibre.In various types of fiber lasers, the high-power low-noise single frequency optical fiber laser has important use and is worth, it can be used as the LASER Light Source of interfere type hydrophone, laser windfinding radar, resonator fiber optic gyroscope, high accuracy strain/stress transducer etc., indexs such as its live width, power, frequency noise can compare favourably with expensive all solid state annular cavity laser, become an important technology approach with high performance-price ratio low noise single frequency laser.
In the technology of existing fiber laser, realize that the method for high-power low-noise single-frequency output mainly contains two kinds: have the circular cavity optic fibre laser of arrowband frequency-selecting device and adopt the long linear-cavity optical fiber laser of short cavity.The former filter such as usually adopts in the inner F-P of adding of annular chamber chamber or introduces saturated absorbing body and realize the output of single mode narrow linewidth low noise as narrow band filter outside the chamber; this structure Active Optical Fiber length is longer; this can cause the frequency stability of laser relatively poor usually, has the moding problem.In short-term die cavity laser, there are reflection of distribution (DBR) and two kinds of distributed feed-back (DFB) dissimilar.In the dbr structure, resonant cavity is made up of two fiber gratings that are connected on the Active Optical Fiber two ends, in order to realize the output of high power single-frequency low noise, need length to have only the Active Optical Fiber of several centimetres high-dopant concentration, as the high power narrow linewidth single frequency optical fiber laser patent (US2004/0240508A1) of NP company application and the patent (200810220661.X) of south China science and engineering application.This dbr structure has very high requirement to Active Optical Fiber, and expense is very expensive on the development high-gain optical fiber.In the DFB structure, resonant cavity is the phase-shifted grating of directly writing on Active Optical Fiber, and special structure has guaranteed the output of laser low noise single-frequency, because the high-gain Active Optical Fiber is difficult to write the system grating, so the common gain coefficient of the Active Optical Fiber that uses in this structure is lower, power output is limited.In order to realize improving power output, the way that adopts is to connect an image intensifer again in laser output back usually, and this image intensifer has oneself independently optical isolator and pumping source.Because DFB fiber laser (seed laser) separates with image intensifer, so size is bigger, energy utilization rate is low, thereby device redundancy causes cost higher, is difficult to practicability.
Summary of the invention
The objective of the invention is to, a kind of high-power low-noise single frequency optical fiber laser is provided, it can overcome the deficiency that seed laser and amplifier are separated, and it is little to have size, the high and lower-cost advantage of energy utilization rate.
The invention provides a kind of high-power low-noise single frequency optical fiber laser, comprising:
The semiconductor laser;
One active phase-shifted grating, an end of this active phase-shifted grating is connected with the output of semiconductor laser;
One has the optical isolator of wavelength selectivity, and this input with optical isolator of wavelength selectivity is connected with the other end of active phase-shifted grating;
One Active Optical Fiber, an end of this Active Optical Fiber is connected with the output of the optical isolator with wavelength selectivity;
One has the band pass filter of light buffer action, and this input with band pass filter of light buffer action is connected with the other end of Active Optical Fiber.
The light that wherein has a wavelength selectivity is isolated and to be made up of wavelength division multiplexer and flashlight isolator, can be by pump light and flashlight, but only flashlight is had the reverse isolation effect.
The band pass filter that wherein has the light buffer action is made up of circulator and fiber grating, only allows flashlight pass through, and flashlight is had the reverse isolation effect.
Wherein the pump light wavelength of semiconductor laser emission is at 976nm, and power output is 50-400mW.
Wherein the length of active phase-shifted grating is 4-10cm.
The optical isolator that wherein has a wavelength selectivity to the insertion loss of pump light less than 1.5dB.
Description of drawings
For further specifying concrete technology contents of the present invention, below in conjunction with embodiment and accompanying drawing the present invention is done a detailed description, wherein:
Fig. 1 is a structural representation of the present invention.
Wherein: 1. being semiconductor laser, 2. is active phase-shifted grating, for having the optical isolator of wavelength selectivity, 4. is Active Optical Fiber 3., 5. the band pass filter for having the light buffer action.
Embodiment
Please refer to Fig. 1, Fig. 1 is the structural representation of single fiber multi-wavelength optical fiber laser provided by the invention, this fiber laser comprises: semiconductor laser 1, active phase-shifted grating 2, optical isolator 3 with wavelength selectivity, Active Optical Fiber 4 and band pass filter 5 with light buffer action, wherein, this semiconductor laser 1 connects an end of active phase-shifted grating 2, the other end of active phase-shifted grating 2 connects the input of the optical isolator 3 with wavelength selectivity, output with optical isolator 3 of wavelength selectivity connects an end of Active Optical Fiber 4, and another termination of Active Optical Fiber 4 has the input of the band pass filter 5 of light buffer action.
The optical isolator 3 that wherein has wavelength selectivity is made up of wavelength division multiplexer and flashlight isolator, can be by pump light and flashlight, but only flashlight is had the reverse isolation effect.
The band pass filter 5 that wherein has the light buffer action is made up of circulator and fiber grating, only allows flashlight pass through, and flashlight is had the reverse isolation effect.
In the present embodiment, the pump light wavelength of semiconductor laser 1 emission is at 976nm, and power output is 100mW.The length of active phase-shifted grating 2 is 4-10cm (present embodiment is 5cm), Er-doped fiber is as active medium, centre wavelength is near 1535nm, under 50-400mW (present embodiment is 100mW) pump light effect, the low noise forward signal light of output single-frequency, power is about 100 μ W, and side mode suppression ratio is about 55dB.Forward signal light and the remaining pump light optical isolator 3 through having wavelength selectivity enters Er-doped fiber 4.This optical isolator 3 with wavelength selectivity can be simultaneously by pump light and flashlight, but only flashlight is had buffer action, prevents that reverse signal light from entering active phase-shifted grating and the moding and the noise that cause increase problem.Optical isolator 3 with wavelength selectivity is made up of wavelength division multiplexer and flashlight isolator, and the insertion loss of pump light less than 1.5dB, has been overcome the normal signal optical isolator and has been difficult to problem by pump light.Residual pump light enters 4 meters long Er-doped fibers 4, makes erbium ion generation population inversion, and then the power of amplifying signal light is to the 20mW.Flashlight, small portion of residual pump light and amplified spont-aneous emission light after amplifying then enter the band pass filter 5 with buffer action.This filter 5 is made up of circulator and fiber grating, circulator has buffer action to the reverse transfer of flashlight, fiber grating is to be used for flashlight is carried out bandpass filtering, guarantees that only there is flashlight in the output of filter, the spontaneous emission light of no remnant pump light and other wavelength.Flashlight power output behind filter is about 10mW, and side mode suppression ratio can reach 60dB, the constant and maintenance single-frequency output characteristic of flashlight noise level.This novel high-power low-noise single frequency optical fiber laser adopts single semiconductor laser that active phase-shifted grating and Er-doped fiber are carried out pumping, and seed laser and image intensifer merge, and have made full use of pump light, have improved capacity usage ratio.In addition, overall structure is simple, break-even optical device.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection range of claim of the present invention.
Claims (6)
1. high-power low-noise single frequency optical fiber laser comprises:
The semiconductor laser;
One active phase-shifted grating, an end of this active phase-shifted grating is connected with the output of semiconductor laser;
One has the optical isolator of wavelength selectivity, and this input with optical isolator of wavelength selectivity is connected with the other end of active phase-shifted grating;
One Active Optical Fiber, an end of this Active Optical Fiber is connected with the output of the optical isolator with wavelength selectivity;
One has the band pass filter of light buffer action, and this input with band pass filter of light buffer action is connected with the other end of Active Optical Fiber.
2. high-power low-noise single frequency optical fiber laser according to claim 1, the light that wherein has a wavelength selectivity is isolated and to be made up of wavelength division multiplexer and flashlight isolator, can be by pump light and flashlight, but only flashlight is had the reverse isolation effect.
3. high-power low-noise single frequency optical fiber laser according to claim 1, the band pass filter that wherein has the light buffer action is made up of circulator and fiber grating, only allows flashlight pass through, and flashlight is had the reverse isolation effect.
4. high-power low-noise single frequency optical fiber laser according to claim 1, wherein the pump light wavelength of semiconductor laser emission is at 976nm, and power output is 50-400mW.
5. high-power low-noise single frequency optical fiber laser according to claim 1, wherein the length of active phase-shifted grating is 4-10cm.
6. high-power low-noise single frequency optical fiber laser according to claim 1, the optical isolator that wherein has a wavelength selectivity to the insertion loss of pump light less than 1.5dB.
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| CN 201110086540 CN102185240A (en) | 2011-04-07 | 2011-04-07 | High-power low-noise single-frequency optical fiber laser |
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| CN 201110086540 CN102185240A (en) | 2011-04-07 | 2011-04-07 | High-power low-noise single-frequency optical fiber laser |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006733A (en) * | 2014-04-22 | 2015-10-28 | 深圳激扬光电有限公司 | High-peak power laser, and protection method and apparatus thereof |
| CN107658685A (en) * | 2017-10-26 | 2018-02-02 | 南京理工大学 | A kind of 1 micron of single frequency optical fiber laser |
| CN110277723A (en) * | 2019-06-19 | 2019-09-24 | 南京理工大学 | Optimize the method for the related transient response of high-capacity optical fiber laser heat |
| CN110838671A (en) * | 2019-12-12 | 2020-02-25 | 上海瀚宇光纤通信技术有限公司 | Single-frequency optical fiber laser |
| CN113517627A (en) * | 2021-03-30 | 2021-10-19 | 廊坊市路环科技有限公司 | Ultra-narrow linewidth optical fiber laser capable of inhibiting relaxation oscillation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1988422A (en) * | 2006-11-06 | 2007-06-27 | 中国科学院上海光学精密机械研究所 | High-power narrow-linewidth signal source with 1053nm wavelength |
| CN101425655A (en) * | 2007-10-31 | 2009-05-06 | 中国科学院半导体研究所 | Apparatus for distributed feedback optical fiber laser frequency modulation and denoising |
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2011
- 2011-04-07 CN CN 201110086540 patent/CN102185240A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988422A (en) * | 2006-11-06 | 2007-06-27 | 中国科学院上海光学精密机械研究所 | High-power narrow-linewidth signal source with 1053nm wavelength |
| CN101425655A (en) * | 2007-10-31 | 2009-05-06 | 中国科学院半导体研究所 | Apparatus for distributed feedback optical fiber laser frequency modulation and denoising |
Non-Patent Citations (1)
| Title |
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| 《物理学报》 20110131 薛力芳 等 高频调制大功率窄线宽分布反馈光纤激光器 第60卷, 第1期 2 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006733A (en) * | 2014-04-22 | 2015-10-28 | 深圳激扬光电有限公司 | High-peak power laser, and protection method and apparatus thereof |
| CN107658685A (en) * | 2017-10-26 | 2018-02-02 | 南京理工大学 | A kind of 1 micron of single frequency optical fiber laser |
| CN110277723A (en) * | 2019-06-19 | 2019-09-24 | 南京理工大学 | Optimize the method for the related transient response of high-capacity optical fiber laser heat |
| CN110838671A (en) * | 2019-12-12 | 2020-02-25 | 上海瀚宇光纤通信技术有限公司 | Single-frequency optical fiber laser |
| CN113517627A (en) * | 2021-03-30 | 2021-10-19 | 廊坊市路环科技有限公司 | Ultra-narrow linewidth optical fiber laser capable of inhibiting relaxation oscillation |
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Application publication date: 20110914 |