CN109149331A - A kind of short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings - Google Patents
A kind of short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings Download PDFInfo
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- CN109149331A CN109149331A CN201811113220.XA CN201811113220A CN109149331A CN 109149331 A CN109149331 A CN 109149331A CN 201811113220 A CN201811113220 A CN 201811113220A CN 109149331 A CN109149331 A CN 109149331A
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] 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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0401—Arrangements for thermal management of optical elements being part of laser resonator, e.g. windows, mirrors, lenses
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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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0405—Conductive cooling, e.g. by heat sinks or thermo-electric elements
-
- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
- H01S3/1055—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length one of the reflectors being constituted by a diffraction grating
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of short straight chamber single frequency optical fiber lasers based on double high anti-fiber gratings, by single mode semiconductor laser pumping source, two division multiplexers, two optoisolators, two anti-fiber gratings of height, two temperature controls are heat sink and doped gain fiber composition, two anti-fiber gratings of height be placed in two temperature controls it is heat sink in, the anti-fiber grating of two height forms single frequency optical fiber laser resonant cavity, two beam single-frequency lasers caused by the single frequency optical fiber laser resonant cavity, beam of laser therein is exported by the first wavelength division multiplexer via the first optoisolator, and another beam of laser then passes through the second wavelength division multiplexer and exports through the second optoisolator.Its structure is simple, lumen type is compact, low in cost, flexible operation, can be widely applied to the technical fields such as Fibre Optical Sensor, laser radar, laser exploration, laser ranging and laser medicine.
Description
Technical field
The invention belongs to fiber laser technology fields, and in particular to a kind of short straight chamber list based on double high anti-fiber gratings
Frequency optical fiber laser.
Background technique
Single frequency optical fiber laser refers to work under single longitudinal mode operating condition, has good coherence, high monochromaticity, defeated
The very narrow a kind of optical fiber laser of spectral line width out.Since single frequency optical fiber laser has, high coherence, output mode be good, low phase
The advantages that noise, line width, thus it Fibre Optical Sensor, laser radar, high-resolution spectroscopy and in terms of have
It is widely used.Short straight chamber single frequency optical fiber laser based on distributed Blatt reflective formula, by its is simple and compact for structure, just
In integrated, easy realization single-frequency output, strong antijamming capability, it is low in cost the advantages that, it is considered to be at present it is most promising
One of with the single-frequency laser light source of application potential.
The short straight chamber single frequency optical fiber laser of common distributed Blatt reflective formula structure, it is usually reflective by a broadband height
Fine grating, high-concentration dopant gain fibre and one form as the narrow portion reflectivity fiber grating of output coupling mirror.It wants
So that it is obtained single longitudinal mode oscillation output, requires under the premise of realizing laser generation first, cavity length of the resonator chamber is short as far as possible, with
Realize biggish longitudinal mode spacing Δ νq.Secondly, the gain bandwidth Δ ν in laser cavity is narrow as far as possible.When coupling exports narrow band fiber
When the high reflective fine optical grating reflection peak in optical grating reflection peak and broadband is completely coincident, the gain bandwidth Δ ν in resonant cavity is mainly by coupling
The bandwidth for exporting narrow band fiber bragg grating determines.If gain bandwidth Δ ν is greater than the interval delta between intracavitary adjacent longitudinal mode in resonant cavity
νq, and (Δ ν when longitudinal mode spacing less than twiceq<Δν<2Δνq), then achieving that single longitudinal mode exports.
In order to realize the oscillation output of the distributed Blatt reflective formula single frequency optical fiber laser with shorter gain fibre, lead to
Often need to take following two technological means:
(1), the gain fibre of high-concentration dopant is chosen.Currently, common high-concentration dopant gain fibre is generally phosphoric acid
Salt type optical fiber, price costly, and are mostly extraordinary customization optical fiber, are not easy purchase and obtain.In addition, this gain fibre with silicon
When fiber grating made of hydrochlorate type optical fiber carries out welding, since two type optical fiber material fusing points differ larger, low-loss, high-performance
Welding is more difficult.
(2), the reflectivity of coupling output narrow band fiber bragg grating is improved, to increase the positive feedback of resonant cavity.However many institute's weeks
Know, due to the property of fiber grating inherently, if to obtain higher reflectivity, just cannot achieve relatively narrow reflection peak band
It is wide.It is short to increase building distributed Blatt reflective formula to contradiction to a certain extent for this of the reflectivity of fiber grating and bandwidth
The technical difficulty of straight chamber single frequency optical fiber laser limits the further development and application of this optical fiber laser.
Summary of the invention
In view of the above-mentioned drawbacks of the prior art or insufficient, the object of the present invention is to provide a kind of structure is simply tight
It gathers, be easy to construct, the short straight chamber single frequency optical fiber laser low in cost and flexible operation based on double high anti-fiber gratings.
In order to realize that above-mentioned task, the present invention use following technical solution:
A kind of short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings, which is characterized in that by single mode semiconductor
Laser pumping source, the first wavelength division multiplexer, the first optoisolator, the first high anti-fiber grating, the first temperature control is heat sink, adulterates gain
Optical fiber, the second high anti-fiber grating, the second temperature control is heat sink, the second wavelength division multiplexer, the second optoisolator composition；Wherein, described
First high anti-fiber grating be placed in the first temperature control it is heat sink in, the second high anti-fiber grating be placed in the second temperature control it is heat sink in.
Single mode semiconductor laser pumping source is connected with the pumping end of the first wavelength division multiplexer, the first wavelength division multiplexer it is public
It holds and is connect with one end of the first high anti-fiber grating, the signal end of the first wavelength division multiplexer is connect with the first optoisolator, and first
The doped gain fibre of the other end of high anti-fiber grating is connect with one end of the second high anti-fiber grating；Second high reflective fine light
The other end of grid is connected with the common end of the second wavelength division multiplexer, and the signal end of the second wavelength division multiplexer and the second optoisolator connect
It connects；First high anti-fiber grating and the second high anti-fiber grating form single frequency optical fiber laser resonant cavity；The single frequency fiber laser
Two beam single-frequency laser caused by device resonant cavity, beam of laser therein is by the first wavelength division multiplexer via the first optoisolator
Output, and another beam of laser then passes through the second wavelength division multiplexer and exports through the second optoisolator.
According to the present invention, the first high anti-fiber grating and the second high anti-fiber grating make it anti-under temperature control
Penetrating spectrum or transmitted spectrum edge, there are crossover regions.
Further, the first high anti-fiber grating and the second high anti-fiber grating pair pump wavelength transmissivity are big
In 90%, 99% is greater than to the reflectivity near Output of laser wavelength.
Preferably, the single frequency optical fiber laser being made of the first high anti-fiber grating and the second high anti-fiber grating
The effective cavity length of resonant cavity is not more than 4cm.
The doped gain fiber is 10-20mm using length.
First temperature control is heat sink and the second temperature control is heat sink is that the good conductor of the heat such as red copper, brass, aluminium is made, and all
It is built-up by temperature sensor, thermoelectric cooler, temperature controller.
Short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings of the invention, structure is simple, lumen type is compact,
Low in cost, flexible operation can be widely applied to Fibre Optical Sensor, laser radar, laser exploration, laser ranging and laser medicine etc.
Technical field.Compared with common short straight chamber single frequency optical fiber laser, main innovation point is:
(1) gain bandwidth in resonant cavity is determined jointly by anti-(saturating) crossover region for penetrating spectrum of two anti-fiber gratings of height
It is fixed.Since the slope on anti-(saturating) the rise/fall edge for penetrating spectrum of high anti-fiber grating is larger, then passing through accurate temperature control
System, the interacvity gain smaller bandwidth that crossover region can be made to determine.Avoiding problems use narrow bandwidth, partial reflectance optical fiber light
Grid are used as output coupling mirror.
(2) by carrying out accurate temperature control to the anti-fiber grating of two height, when the crossover region that their anti-(saturating) penetrate spectrum becomes larger
When, the reflectivity of two anti-fiber gratings of height will become larger, and the positive feedback provided for laser resonator is also higher.Therefore, it adopts
It is of less demanding to the doping concentration of gain fibre with the short straight chamber single frequency optical fiber laser of the technical solution.On the other hand, pass through
Temperature control changes the size of the reflective fine grating spectrum crossover region of two height, can neatly change the intracavitary positive feedback of laser resonance
Size, and then the laser output power of this single frequency optical fiber laser can be controlled with this.
(3) when anti-(saturating) spectrum of penetrating of two anti-fiber gratings of height is there are when crossover region, two fiber gratings is anti-at this time
The rate of penetrating will reduce, therefore the output of two beam single-frequency lasers can be generated simultaneously from the both ends of the resonant cavity of fibre-optical laser.
Detailed description of the invention
Fig. 1 is the short straight chamber single frequency optical fiber laser structural schematic diagram of the invention based on double high anti-fiber gratings；
Fig. 2 is that two anti-fiber gratings of height anti-(saturating) penetrate spectrum relative position and laser generation output spectrum schematic diagram.
Label in figure respectively indicates: 1, single mode semiconductor laser pumping source, the 2, first wavelength division multiplexer, the 3, first light
Isolator, the 4, first high anti-fiber grating, the 5, first temperature control is heat sink, 6, doped gain fiber, the 7, second high anti-fiber grating, 8,
Second temperature control is heat sink, the 9, second wavelength division multiplexer, the 10, second optoisolator.
Below in conjunction with drawings and examples, the present invention is described in further detail.
Specific embodiment
It should be noted that embodiment below is only a kind of preferred embodiment of technical solution of the present invention, the present invention is not
It is limited to the embodiment, addition that those skilled in the art is made on the basis of the technical solution that embodiment provides and equivalent replaces
It changes, all belongs to the scope of protection of the present invention.
Referring to Fig. 1, the present embodiment provides a kind of short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings, by list
Mould semiconductor laser pumping source 1, the first wavelength division multiplexer 2, the first optoisolator 3, the first high anti-fiber grating 4, the first temperature control
Heat sink 5, doped gain fiber 6, the second high anti-fiber grating 7, the second temperature control is heat sink 8, the second wavelength division multiplexer 9, the second light every
It is formed from device 10.Wherein, the first high anti-fiber grating 4 is placed in the first temperature control heat sink 5, and the second high anti-fiber grating 7 is placed in the
Two temperature controls are heat sink in 8；Connection relationship between each component are as follows:
Single mode semiconductor laser pumping source 1 is connected with the pumping end of the first wavelength division multiplexer 2, the first wavelength division multiplexer 2
Signal end is connected with the first optoisolator 3, and the common end of the first wavelength division multiplexer 2 and one end of the first high anti-fiber grating 4 connect
It connecing, the doped gain fibre 6 of the other end of the first high anti-fiber grating 4 is connect with one end of the second high anti-fiber grating 7, and second
The other end of high anti-fiber grating 7 is connect with the common end of the second wavelength division multiplexer 9, the signal end of the second wavelength division multiplexer 9 and
It is humorous that the connection of second optoisolator 10, the first high anti-fiber grating 4 and the second high anti-fiber grating 7 form single frequency optical fiber laser
Shake chamber.The two beam single-frequency lasers that the single frequency optical fiber laser resonant cavity generates, beam of laser pass through the letter of the first wavelength division multiplexer 2
Number end is exported via the first optoisolator 3, another and beam of laser by the signal end of the second wavelength division multiplexer 9 via the second light every
It is exported from device 10.
In the present embodiment, the first high anti-fiber grating 4 makes under temperature control with the second high anti-fiber grating 7
There are crossover regions for its reflectance spectrum or transmitted spectrum edge.
The high anti-fiber grating 4 of described first and the second high anti-fiber grating 7 are greater than 90% to pump wavelength transmissivity,
99% is greater than to the reflectivity near Output of laser wavelength.
All optical fibre devices are all attached by welding mode.
In the present embodiment, 1 output wavelength of single mode semiconductor laser pumping source is 976nm.
First high anti-fiber grating 4 is identical with the parameters of the second high anti-fiber grating 7: grid region length is 15mm, instead
Penetrating spectrum central wavelength is about 1030nm, and it is 0.3nm that 3dB, which reflects spectrum width, and central wavelength reflectivity is greater than 99%.
As long as the linear resonant cavity effective cavity length being made of the first high anti-fiber grating 4 and the second high anti-fiber grating 7
It can (the present embodiment 2.2cm) no more than 4cm.
The doped gain fiber 6 used is to mix ytterbium (Yb3+) quartz glass optical fiber, length can be 10-20mm (this reality
The length for applying example is 14mm).In order to protect entire resonant cavity, it is encapsulated in quartz glass tube.
In the present embodiment, the first temperature control is heat sink 5 and second temperature control heat sink 8 be that (or selection red copper, aluminium etc. is made in brass
The good conductor production of heat), and (accuracy of temperature control is by temperature sensor, thermoelectric cooler (TEC) and high-precisive temperature controllers
0.01 DEG C) building, the high-precisive temperature controllers are for (5,8) heat sink to the first, second temperature control progress temperature control.
When pump power is lower than laser oscillation threshold value, the gain fibre in resonant cavity can generate the spontaneous spoke of amplification
It penetrates.At this point, the amplified spontaneous emission exported from the second optoisolator 10 is accessed spectrometer, the first high reflective fibre can be observed
The transmission spectrum of the reflectance spectrum of grating 4 and the second high anti-fiber grating 7.
When 1 output power of single mode semiconductor laser pumping source is 4 milliwatt, by the first high anti-4 temperature setting of fiber grating
It is 12 DEG C, the second high anti-7 temperature setting of fiber grating is 60.1 DEG C, at this time the reflectance spectrum B and second of the first high anti-fiber grating 4
The relative position of the transmission spectrum A of high anti-fiber grating 7 is as shown in Fig. 2.From figure 2 it can be seen that two anti-fiber gratings of height are anti-
(saturating) penetrates the edge of spectrum, and there are a relatively narrow spectrum crossover regions.The narrowband crossover region determines the resonant cavity of fibre-optical laser
Gain bandwidth.It, will be in the defeated of the first optoisolator 3 and the second optoisolator 10 when pump power is more than 5.6 milliwatt of threshold value
Outlet generates the single longitudinal mode laser oscillation output that central wavelength is 1030.05nm simultaneously, as shown in spectrum C in Fig. 2.In addition, such as
The temperature of first high anti-fiber grating 4 and the second high anti-fiber grating 7 is tuned according to identical temperature step length by fruit simultaneously,
Will generation wavelength continuously adjustable single-frequency laser output.
The short straight cavity structure single frequency optical fiber laser based on double high anti-fiber gratings that the present embodiment provides, not only overcomes
Requirement of the short straight cavity structure single frequency optical fiber laser of traditional distributed Blatt reflective formula to coupling output optical fibre grating bandwidth, and
And it is of less demanding to the doping concentration of gain fibre.In addition, by carrying out accurate temperature controller simultaneously to two anti-fiber gratings of height, also
The single-frequency laser output of wavelength continuously adjustable can be achieved.This short straight chamber single frequency fiber laser based on double high anti-fiber gratings
Device can be widely applied to Fibre Optical Sensor, laser by the advantages that its structure is simple, lumen type is compact, low in cost, flexible operation
The fields such as radar, laser exploration, laser ranging and laser medicine.
Claims (6)
1. a kind of short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings, which is characterized in that swashed by single mode semiconductor
Optical pumping source (1), the first wavelength division multiplexer (2), the first optoisolator (3), the first high anti-fiber grating (4), the first temperature control heat
Heavy (5), doped gain fiber (6), the second high anti-fiber grating (7), the second temperature control is heat sink (8), the second wavelength division multiplexer (9),
Second optoisolator (10) composition；Wherein, the described first high anti-fiber grating (4) is placed in the first temperature control heat sink (5), and second is high
Anti- fiber grating (7) is placed in the second temperature control heat sink (8)；
Single mode semiconductor laser pumping source (1) is connected with the pumping end of the first wavelength division multiplexer (2), the first wavelength division multiplexer (2)
Signal end connect with the first optoisolator (3), the common end of the first wavelength division multiplexer (2) and the first high anti-fiber grating (4)
One end connection, the doped gain fibre of the other end (6) of the first high anti-fiber grating (4) and the second high anti-fiber grating (7)
One end connection；The other end of second high anti-fiber grating (7) is connected with the common end of the second wavelength division multiplexer (9), the second wave
The signal end of division multiplexer (9) is connect with the second optoisolator (10), the first high anti-fiber grating (4) and the second high reflective fine light
Grid (7) form single frequency optical fiber laser resonant cavity, two beam single-frequency lasers caused by the single frequency optical fiber laser resonant cavity, wherein
Beam of laser exported by the first wavelength division multiplexer (2) via the first optoisolator (3), and another beam of laser then passes through second
Wavelength division multiplexer (9) is exported through the second optoisolator (10).
2. as described in claim 1 based on the short straight chamber single frequency optical fiber laser of double high anti-fiber gratings, which is characterized in that institute
The high anti-fiber grating (4) of first stated makes its reflectance spectrum or transmitted light with the second high anti-fiber grating (7) under temperature control
There are crossover regions at boundary of spectrum.
3. as described in claim 1 based on the short straight chamber single frequency optical fiber laser of double high anti-fiber gratings, which is characterized in that institute
The high anti-fiber grating (4) of first stated and the second high anti-fiber grating (7) are greater than 90% to pump wavelength transmissivity, to output
Reflectivity near optical maser wavelength is greater than 99%.
4. as described in claim 1 based on the short straight chamber single frequency optical fiber laser of double high anti-fiber gratings, which is characterized in that institute
The single frequency optical fiber laser resonant cavity being made of the first high anti-fiber grating (4) and the second high anti-fiber grating (7) stated has
Effect chamber is failed to grow up in 4cm.
5. as described in claim 1 based on the short straight chamber single frequency optical fiber laser of double high anti-fiber gratings, which is characterized in that institute
The doped gain fiber (6) stated is 10-20mm using length.
6. as described in claim 1 based on the short straight chamber single frequency optical fiber laser of double high anti-fiber gratings, which is characterized in that institute
The first temperature control stated is heat sink (5) and the second temperature control heat sink (8) is that the good conductor of the heat such as brass, red copper, aluminium is made, and all by temperature
It is built-up to spend sensor, thermoelectric cooler, temperature controller.
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| CN201811113220.XA CN109149331A (en) | 2018-09-25 | 2018-09-25 | A kind of short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings |
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| CN201811113220.XA CN109149331A (en) | 2018-09-25 | 2018-09-25 | A kind of short straight chamber single frequency optical fiber laser based on double high anti-fiber gratings |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797737A (en) * | 2019-10-31 | 2020-02-14 | 西安交通大学 | Short straight cavity single-polarization single-longitudinal mode optical fiber laser and preparation method thereof |
| WO2020155249A1 (en) * | 2019-01-31 | 2020-08-06 | 深圳大学 | Dual-frequency light source |
| CN111509546A (en) * | 2019-01-31 | 2020-08-07 | 深圳大学 | Double-frequency light source |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020155249A1 (en) * | 2019-01-31 | 2020-08-06 | 深圳大学 | Dual-frequency light source |
| CN111509546A (en) * | 2019-01-31 | 2020-08-07 | 深圳大学 | Double-frequency light source |
| CN110797737A (en) * | 2019-10-31 | 2020-02-14 | 西安交通大学 | Short straight cavity single-polarization single-longitudinal mode optical fiber laser and preparation method thereof |
| CN110797737B (en) * | 2019-10-31 | 2021-01-19 | 西安交通大学 | Short straight cavity single-polarization single-longitudinal mode optical fiber laser and preparation method thereof |
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