CN106451045A - Multi-wavelength single-frequency fiber laser with short and straight cavity structure - Google Patents
Multi-wavelength single-frequency fiber laser with short and straight cavity structure Download PDFInfo
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- CN106451045A CN106451045A CN201610968381.1A CN201610968381A CN106451045A CN 106451045 A CN106451045 A CN 106451045A CN 201610968381 A CN201610968381 A CN 201610968381A CN 106451045 A CN106451045 A CN 106451045A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/17—Solid materials amorphous, e.g. glass
- H01S3/175—Solid materials amorphous, e.g. glass phosphate glass
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a multi-wavelength single-frequency fiber laser with a short and straight cavity structure. The multi-wavelength single-frequency fiber laser comprises a high-gain fiber, a narrow-band multi-wavelength polarization maintaining fiber, a wide-band fiber bragg grating, a single-mode semiconductor pump light source, a wavelength division multiplexer, a fiber isolator and a semiconductor optical amplifier. The fiber laser uses output laser produced by the single-mode semiconductor pump light source as the pump light source, and the multi-wavelength narrow-band fiber bragg grating and the wide-band fiber bragg grating achieve selection of multiple laser wavelengths together. The polarization maintaining multi-wavelength narrow-band fiber bragg grating with a multi-grating structure is adopted, so that multiple different wavelengths of laser is output in a resonance cavity in a resonance mode, light splitting and filtering are performed through the wavelength division multiplexer, and simultaneous output of multiple single-frequency laser in the same laser cavity is achieved. The multi-wavelength single-frequency fiber laser can enlarge a scanning range in laser radar application, and the working efficiency of the laser radar is greatly improved. In addition, the multi-wavelength single-frequency fiber can be simultaneously used in the fields of space detection, coherent light communication, Doppler wind-finding radar, gravitational wave detection, quantum optics and the like.
Description
Technical field
The present invention relates to laser radar, Fibre Optical Sensor, coherent swpectrum close the fields such as bundle can be especially useful for laser radar
Fiber laser technology that system is applied is and in particular to a kind of hard-packed short straight chamber multi-wavelength single frequency fiber LASER Light Source.
Background technology
Laser radar system includes a single bundle narrow band laser and a reception system.Laser instrument is generated and transmitted by a branch of
Light pulse, beats on object and reflects, finally received by receiver.Receiver accurately measures light pulse from being transmitted into
The propagation time being reflected back toward.Because light pulse was received before next pulse sends with light velocity propagation, receiver federation
To the previous pulse being reflected back toward.In view of the light velocity is known, the propagation time can be converted into the measurement adjusted the distance.In conjunction with
The height of laser instrument, laser scanning angle, the position of the laser instrument obtaining from GPS and the Laser emission direction obtaining from INS, just
The coordinate X of each ground hot spot, Y, Z can be calculated exactly.The frequency of radiating laser beams can be from several pulses per second
To tens of thousands of pulses per second.For example, frequency is the system of 10,000 subpulses per second, and receiver will be in one minute
Record 600,000 points.If can multiple frequencies work, then the scan efficiency of laser radar will greatly promote simultaneously.
The present patent application proposes a kind of multi-wavelength single frequency optical fiber laser of short straight cavity configuration, and the guarantor using multi-wavelength is inclined
Grating, realizes multi-wavelength output in short straight chamber, can increase single bundle laser of narrowband number in laser radar system, will effectively
Laser scanning scope is promoted to original several times to more than tens times.Laser radar is allow to have wider application.
Content of the invention
It is an object of the invention to overcoming the shortcoming of prior art, provide a kind of multi-wavelength single frequency fiber of short straight cavity configuration
Laser instrument, is fused using multi-wavelength fiber grating, high-gain optical fiber and band optical fiber grating and forms short straight resonator, realize
The output of multi-wavelength single-frequency laser is realized in close structure.
The present invention utilizes the highly doped and high gain characteristics of phosphate glass core material, makes phosphate glass single-mode optics
Fibre, as laser medium material, using short straight cavity configuration, produces the output of multi-wavelength single-frequency laser.
The purpose of the present invention is realized at least through one of following technical scheme.
A kind of multi-wavelength single frequency optical fiber laser of short straight cavity configuration, including single mode semiconductor pump laser, a ripple
Division multiplexer, band optical fiber grating, high-gain optical fiber, multi-wavelength narrow band fiber bragg grating, optoisolator, semiconductor optical amplifier,
Wavelength division multiplexer；The structural relation of each part is：The common port of wavelength division multiplexer is connected with one end of band optical fiber grating, broadband
The other end of fiber grating connects through high-gain optical fiber and multi-wavelength narrow band fiber bragg grating, and high-gain optical fiber is situated between as laser gain
Hysteroscope before and after matter, multi-wavelength narrow band fiber bragg grating and band optical fiber grating composition laser cavity, single mode semiconductor pump laser produces
Raw pump light inputs via the pumping end of light wavelength division multiplexing, via band optical fiber grating in the fibre core of high-gain optical fiber, enters
Row fibre core pumping, resonator output laser signal via wavelength division multiplexer signal end output enter optoisolator, from light every
Laser signal from device output carries out noise suppressed and optical property optimization via semiconductor optical amplifier, then via wavelength-division multiplex
Device exports to the laser signal light splitting of different wave length.
Further, etch multiple gratings in same section of polarization maintaining optical fibre of band optical fiber grating, realize multiple reflection wavelengths；
The bandwidth of broadband grating can cover each wavelength, make the resonance output in laser cavity of different wavelength, realize multi-wavelength output,
Output wavelength includes but includes two or more wavelength.
Further, the unit length gain of described high-gain optical fiber is more than 1 dB/cm, and fiber lengths are 0.5～10cm.
Further, it is to pass through between described band optical fiber grating, high-gain optical fiber and multi-wavelength narrow band fiber bragg grating
Direct Butt-coupling after the respective fiber end face of grinding and polishing, or coupled by optical fiber splicer welding.
Further, the center reflection wavelength of described band optical fiber grating is laser output wavelength, and 3dB reflectance spectrum is less than
0.1nm, centre wavelength reflectivity is 2-99%；The 3dB reflectance spectrum of multi-wavelength narrow band fiber bragg grating is more than 0.1nm, and defeated to laser
Go out signal wavelength reflectivity and be more than 90%, 90% is more than to pumping wavelength transmissivity.Short straight chamber multi-wavelength single frequency fiber as mentioned above
Laser instrument it is characterised in that：Export the single longitudinal mode laser of multiple wavelength in same short straight chamber, such as its band optical fiber grating uses
Special process etches multiple gratings in same section of polarization maintaining optical fibre, realizes multiple reflection wavelengths, and the bandwidth of broadband grating can be covered
Cover each wavelength, make different wavelength in laser cavity resonance output, realize multi-wavelength output, in output wavelength include but not
It is limited to two or several wavelength etc..
Further, short straight chamber multi-wavelength single frequency optical fiber laser is short straight cavity configuration as mentioned above, and its front cavity mirror is many
Wavelength narrow band fiber grating, Effect of Back-Cavity Mirror can be dichroic mirror or band optical fiber grating, and described band optical fiber grating is to pump light
High saturating, transmissivity is more than 90%, and high to pumping signal wavelength anti-, and reflectivity is more than 95%, a width of 0.1nm of its 3dB reflectance spectrum
～10nm.
Can be as mentioned above by by phase between multi-wavelength narrow band fiber bragg grating, high-gain optical fiber and band optical fiber grating
After the corresponding end-faces at the place of connecing are ground polishing, realize end-to-end coupling.
Compared with prior art, the solution have the advantages that：Can be using the high-gain optical fiber of centimetres as laser
Gain media, by multi-wavelength narrow band fiber bragg grating and band optical fiber grating form cavity resonator structure before and after hysteroscope, in single mode
Under the continuous pump in semiconductor laser pumping source, the high-gain particle in fibre core inverts, and produces the laser letter of stimulated emission
Number, in laser cavity, the optical signal of resonance obtains the single longitudinal mode laser of several centre frequency corresponding wavelength after longitudinal mode selection
Signal, goes out multiple passages by wavelength division multiplexer lasing after the performance optimization of semiconductor optical amplifier and corresponds to different center frequency
The single-frequency laser of wavelength.This invention can expand sweep limits in laser radar application, greatly promotes the work effect of laser radar
Rate.It is simultaneously available for the fields such as space exploration, coherent light communication, Doppler anemometry radar, gravitational wave detection and quantum optices.
Brief description
Fig. 1 is single frequency optical fiber laser principle schematic of the present invention.
Specific embodiment
With specific example, the specific embodiment of the present invention is further described below in conjunction with the accompanying drawings, it should be noted that
The scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in figure 1, a kind of short straight chamber multi-wavelength single frequency optical fiber laser, including a single mode semiconductor pump laser
5th, wavelength division multiplexer 4, band optical fiber grating 3, high-gain optical fiber 2, multi-wavelength narrow band fiber bragg grating 1, optoisolator 6, semiconductor
Image intensifer 7, wavelength division multiplexer 8；The structural relation of each part is：The common port of wavelength division multiplexer 4 and band optical fiber grating 3
One end connects, and the other end of band optical fiber grating 3 connects through high-gain optical fiber 2 and multi-wavelength narrow band fiber bragg grating 1, high-gain light
Fine 2 as gain medium, hysteroscope before and after band optical fiber grating 3 and multi-wavelength narrow band fiber bragg grating 1 composition laser cavity, single mode
Semiconductor pump laser 5 produces pump light and inputs via the pumping end of light wavelength division multiplexing 4, arrives via band optical fiber grating 3
In the fibre core of high-gain optical fiber 2, carry out fibre core pumping, the laser signal that resonator exports is via the signal end of wavelength division multiplexer 4
Output enter optoisolator 6, from optoisolator 6 output laser signal via semiconductor optical amplifier 7 carry out noise suppressed with
And optical property optimization, then via wavelength division multiplexer 8, the laser signal light splitting of different wave length is exported.
The output laser that this optical fiber laser is produced using single mode semiconductor laser is as pump light source, multi-wavelength narrow band light
Fine grating realizes the selection of the multiple wavelength of laser together with band optical fiber grating.Using the low anti-many ripples protecting inclined many optical grating constructions
Long narrow band fiber bragg grating, makes laser resonance output in resonator of multiple different wave lengths, carries out light splitting through wavelength division multiplexer
Filtering, realizes output multi-channel single-frequency laser simultaneously in same laser cavity.
Embodiment 1
Multi-wavelength narrow band fiber bragg grating 1 center reflection wavelength of this example is laser output center wavelength 1550 nm, 3dB reflectance spectrum
A width of 2 nm, this example centre wavelength reflectivity is more than 99.95%.The foveal reflex ripple of band optical fiber grating 3 coupling output grating
A length of laser output wavelength 1549.57 nm, 1549.94 nm, 1550.21 nm, 1550.62 nm, the correspondence of each wavelength
A width of 0.1 nm of 3dB reflectance spectrum, centre wavelength reflectivity is 10～95%, and it is 60% that this example centre wavelength penetrates rate.Multi-wavelength arrowband
Fiber grating 1 becomes the functional module of a multi-wavelength resonance with band optical fiber grating 3.Wherein, multi-wavelength narrow band fiber bragg grating 1 He
High-gain optical fiber 2 uses welding or end face docking mode to connect；Fiber end face is adopted between high-gain optical fiber 2 and band optical fiber grating 3
Grinding and polishing is connected with hysteroscope closed butt joint mode.
Pump mode adopts backward pump, produces pump light via OWDM by single mode semiconductor pump laser 5
The pumping end input of device 4, via band optical fiber grating 3 in the fibre core of high-gain optical fiber 2, carries out fibre core pumping.Pump light is not
So as to reach population inversion, stimulated emission produces laser signal to gain particle in disconnected pumping fibre core.Reflection wavelength is corresponding
Optical signal resonance in resonator produce wavelength be 1549.57 nm, 1549.94 nm, 1550.21 nm and 1550.62 nm
Single-frequency laser signal.Laser signal exports from the output end of optoisolator 6 via light wavelength division multiplexing 4, puts via semiconductor light
Big device 7 carries out noise suppressed and optical property optimization, more defeated to the laser letter subchannel of different wave length via wavelength division multiplexer 8
Go out.
Claims (5)
1. a kind of multi-wavelength single frequency optical fiber laser of short straight cavity configuration swashs it is characterised in that including a single mode semiconductor pumping
Light device（5）, wavelength division multiplexer（4）, band optical fiber grating（3）, high-gain optical fiber（2）, multi-wavelength narrow band fiber bragg grating（1）, light
Isolator（6）, semiconductor optical amplifier（7）, wavelength division multiplexer（8）；The structural relation of each part is：Wavelength division multiplexer（4）'s
Common port and band optical fiber grating（3）One end connect, band optical fiber grating（3）The other end through high-gain optical fiber（2）With many
Wavelength narrow band fiber grating（1）Connect, high-gain optical fiber（2）As gain medium, multi-wavelength narrow band fiber bragg grating（1）With
Band optical fiber grating（3）Hysteroscope before and after composition laser cavity, single mode semiconductor pump laser（5）Produce pump light via light wavelength-division
Multiplexer（4）Pumping end input, via band optical fiber grating（3）To high-gain optical fiber（2）Fibre core in, carry out fibre core pump
Pu, the laser signal of resonator output is via wavelength division multiplexer（4）Signal end output enter optoisolator（6）, from optically isolated
Device（6）The laser signal of output is via semiconductor optical amplifier（7）Carry out noise suppressed and optical property optimization, then via wavelength-division
Multiplexer（8）Laser signal light splitting output to different wave length.
2. short straight cavity configuration multi-wavelength single frequency optical fiber laser according to claim 1 it is characterised in that：In band optical fiber
Grating（3）Etch multiple gratings in same section of polarization maintaining optical fibre, realize multiple reflection wavelengths；Broadband grating（1）Bandwidth can cover
Cover each wavelength, make the resonance output in laser cavity of different wavelength, realize multi-wavelength output, output wavelength includes but wraps
Include two or more wavelength.
3. short straight cavity configuration multi-wavelength single frequency optical fiber laser according to claim 1 it is characterised in that：Described high-gain
Optical fiber（2）Unit length gain be more than 1 dB/cm, fiber lengths be 0.5～10cm.
4. short straight cavity configuration multi-wavelength single frequency optical fiber laser according to claim 1 is it is characterised in that described broadband
Fiber grating（3）, high-gain optical fiber（2）With multi-wavelength narrow band fiber bragg grating（1）Between be by the respective optical fiber of grinding and polishing
Direct Butt-coupling after end face, or coupled by optical fiber splicer welding.
5. the multi-wavelength single frequency optical fiber laser of short straight cavity configuration according to claim 1 is it is characterised in that described width
Band fiber grating（3）Center reflection wavelength be laser output wavelength, 3dB reflectance spectrum is less than 0.1nm, and centre wavelength reflectivity is
2-99%；Multi-wavelength narrow band fiber bragg grating（1）3dB reflectance spectrum be more than 0.1nm, and big to laser output signal wavelength reflection
In 90%, 90% is more than to pumping wavelength transmissivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610968381.1A CN106451045A (en) | 2016-10-26 | 2016-10-26 | Multi-wavelength single-frequency fiber laser with short and straight cavity structure |
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| CN201610968381.1A CN106451045A (en) | 2016-10-26 | 2016-10-26 | Multi-wavelength single-frequency fiber laser with short and straight cavity structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233413A (en) * | 2019-07-04 | 2019-09-13 | 深圳市镭神智能系统有限公司 | A kind of multi-Wavelength Pulses optical fiber laser and laser radar system |
| CN110544864A (en) * | 2019-08-12 | 2019-12-06 | 华南理工大学 | Narrow linewidth fiber laser based on frequency modulation single-frequency seed source and four-wave mixing |
| CN111129929A (en) * | 2020-01-09 | 2020-05-08 | 浙江大学 | Multi-wavelength fiber laser based on multi-granularity quantum dot doping and design method thereof |
| CN112636184A (en) * | 2020-12-16 | 2021-04-09 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Mixed high-power single-frequency laser |
| CN114376572A (en) * | 2021-12-29 | 2022-04-22 | 华南理工大学 | Detection device and detection method for blood oxygen saturation |
| WO2023123630A1 (en) * | 2021-12-31 | 2023-07-06 | 上海频准激光科技有限公司 | Multiband single-frequency laser output system |
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| CN104466636A (en) * | 2014-11-30 | 2015-03-25 | 华南理工大学 | Single-frequency Q-switched pulsed fiber laser |
| CN105071207A (en) * | 2015-08-31 | 2015-11-18 | 华南理工大学 | Frequency modulation single-frequency fiber laser based on self-injection locking |
| CN105356206A (en) * | 2015-11-18 | 2016-02-24 | 华南理工大学 | Wide-temperature-adaptation-interval single frequency fiber laser |
| CN105428973A (en) * | 2015-12-18 | 2016-03-23 | 华南理工大学 | Wide tunable single-frequency fiber laser light source for coherent optical orthogonal frequency division multiplexing system |
| CN105529607A (en) * | 2016-01-31 | 2016-04-27 | 华南理工大学 | Broadband single-frequency fiber laser intensity noise suppression device for achieving nearly schottky noise limit |
| CN206422377U (en) * | 2016-10-26 | 2017-08-18 | 华南理工大学 | A kind of multi-wavelength single frequency optical fiber laser of short straight cavity configuration |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104466636A (en) * | 2014-11-30 | 2015-03-25 | 华南理工大学 | Single-frequency Q-switched pulsed fiber laser |
| CN105071207A (en) * | 2015-08-31 | 2015-11-18 | 华南理工大学 | Frequency modulation single-frequency fiber laser based on self-injection locking |
| CN105356206A (en) * | 2015-11-18 | 2016-02-24 | 华南理工大学 | Wide-temperature-adaptation-interval single frequency fiber laser |
| CN105428973A (en) * | 2015-12-18 | 2016-03-23 | 华南理工大学 | Wide tunable single-frequency fiber laser light source for coherent optical orthogonal frequency division multiplexing system |
| CN105529607A (en) * | 2016-01-31 | 2016-04-27 | 华南理工大学 | Broadband single-frequency fiber laser intensity noise suppression device for achieving nearly schottky noise limit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233413A (en) * | 2019-07-04 | 2019-09-13 | 深圳市镭神智能系统有限公司 | A kind of multi-Wavelength Pulses optical fiber laser and laser radar system |
| CN110544864A (en) * | 2019-08-12 | 2019-12-06 | 华南理工大学 | Narrow linewidth fiber laser based on frequency modulation single-frequency seed source and four-wave mixing |
| CN111129929A (en) * | 2020-01-09 | 2020-05-08 | 浙江大学 | Multi-wavelength fiber laser based on multi-granularity quantum dot doping and design method thereof |
| CN112636184A (en) * | 2020-12-16 | 2021-04-09 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Mixed high-power single-frequency laser |
| CN112636184B (en) * | 2020-12-16 | 2022-05-10 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Mixed high-power single-frequency laser |
| CN114376572A (en) * | 2021-12-29 | 2022-04-22 | 华南理工大学 | Detection device and detection method for blood oxygen saturation |
| WO2023123630A1 (en) * | 2021-12-31 | 2023-07-06 | 上海频准激光科技有限公司 | Multiband single-frequency laser output system |
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