CN104466649A - Mode-hop-free fast wavelength modulation single frequency fiber laser - Google Patents
Mode-hop-free fast wavelength modulation single frequency fiber laser Download PDFInfo
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- CN104466649A CN104466649A CN201410769705.XA CN201410769705A CN104466649A CN 104466649 A CN104466649 A CN 104466649A CN 201410769705 A CN201410769705 A CN 201410769705A CN 104466649 A CN104466649 A CN 104466649A
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Abstract
The invention discloses a mode-hop-free fast wavelength modulation single frequency fiber laser. The mode-hop-free fast wavelength modulation single frequency fiber laser is characterized by being provided with a single frequency fiber laser body provided with a fast wavelength modulation system. The single frequency fiber laser body is provided with a pumping semiconductor laser with a tail fiber, the output tail fiber of the pumping semiconductor laser is connected with a pumping input port of a fiber combiner, an output fiber port of the fiber combiner is connected with a high-reflectivity fiber bragg grating, and the other end of the grating is welded to a highly doped gain fiber. The other end of the highly doped gain fiber is welded to a low-reflectivity fiber bragg grating fabricated on a polarization maintaining fiber, and the other end of the low-reflectivity fiber bragg grating is an output end of the fiber laser body. The single frequency fiber laser body is integrated with a laser carrier with a wavelength modulation system. The mode-hop-free fast wavelength modulation single frequency fiber laser can keep mode-hop-free and single-frequency performance in the fiber laser modulation process, and has a large wavelength modulation range, high modulation speed, accurate control over wavelength modulation, high mechanical strength, jamming resistance and high reliability.
Description
Technical field
The present invention relates to a kind of mono-frequency wavelength continuously adjustabe fiber laser, particularly a kind of wavelength can fast modulation, and keeps single-frequency without mode hopping
without mode hopping Rapid wavelength modulation single frequency optical fiber laser, belong to optical fiber and laser technology field.
Background technology
The laser that fiber laser is is gain media with the optical fiber of doped with rare-earth elements, by the different rare earth element that adulterates, as bait (Er), an an ancient unit of weight equal to 20 or 24 *taels of silver (Yb), thulium (Tm), holmium (Ho), neodymium (Nd) etc., the service band of fiber laser cover from ultraviolet to infrared.Compared with other lasers, it is low that fiber laser has laser work threshold value, energy transformation ratio is high, output beam quality good, compact conformation is stable, the distinguishing feature such as long and Maintenance free without the need to light path adjustment, perfect heat-dissipating, life-span, is therefore rapidly developed and applies widely.
Single frequency optical fiber laser, due to special design, has coherence length long in fiber laser, the advantages such as monochromaticjty is good, and breadth of spectrum line is narrow; Continuously adjustabe single frequency optical fiber laser has unique application in a lot of field, such as: Fibre Optical Sensor, and laser designation and remote range finding, Doppler lidar etc.Its industrialization is also had important scientific research by development single-frequency continuously adjustabe fiber laser, economic and social benefit.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of Stability Analysis of Structures, modulation control simple, without mode hopping Rapid wavelength modulation on a large scale, ensure to modulate single frequency optical fiber laser without mode hopping single-frequency without mode hopping Rapid wavelength.
The present invention can be reached by following measure:
A kind of without mode hopping Rapid wavelength modulation single frequency optical fiber laser, comprise continuous single frequency optical fiber laser and wavelength-modulated system two parts, it is characterized in that single-frequency jointed fiber laser comprises: the pumping semiconductor laser of band tail optical fiber, its output tail optical fiber is connected to the pumping input port of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high anti-Fiber Bragg Grating FBG, the other end and the highly doped gain fibre of grating weld together, the other end of highly doped gain fibre with write the low anti-Fiber Bragg Grating FBG be formed on polarization maintaining optical fibre and weld mutually, the low anti-Fiber Bragg Grating FBG other end is the output of fiber laser, high anti-Fiber Bragg Grating FBG, highly doped gain fibre forms laser oscillation cavity with writing after the low anti-Fiber Bragg Grating FBG be formed on polarization maintaining optical fibre welds mutually, wavelength-modulated system comprises laser base, piezoelectric element and piezoelectric element control system, wherein the telescopic direction of piezoelectric element is horizontal direction, laser base devises two symmetrical stretching bars, stretching bar is parallel with the direction that piezoelectric element stretches, when piezoelectric element extends, stretching bar movable end is open, realize stretching to stretching bar, piezoelectric element is seamless with laser base, and the chamber strong adhesive that vibrates is fixed on a stretching bar.
The present invention is the single-frequency ensureing laser, and the length of laser oscillation cavity must be less than 5 centimetres, and therefore highly doped gain fibre is necessary for high-gain.
Reflecting the incident light of Bragg grating of the present invention has center reflection wavelength respectively
with
, the wavelength that laser produces must in the reflected range of Bragg grating, and wavelength must meet following formula:
,
Wherein output wavelength is
,
with
for laser generation cavity length and refraction coefficient,
for integer, for single frequency laser, only have unique
corresponding
drop on
with
centered by reflected range within, what this condition can be similar to is expressed as:
.
The present invention is when single frequency laser modulation wavelength, and the change of three wavelength value is also equal,
, avoid mode hopping,
The wavelength of grating is by following formulae express:
,
Be wherein
with
the effective refractive index of grating and cycle, 1,2 represent two gratings respectively.
In the present invention, the differentiate of three wavelength formula:
,
Due to formula 2,
, with
numerical value be far longer than difference between them, in upper formula
, with
be considered to equal, if ensure following condition when modulation wavelength, the change of three wavelength also can be equal, to realize modulating without mode hopping.
The present invention vibrates the strain of change in size of the variations in refractive index percentage of chamber three part equal and vibration chamber three part when keeping even,
;
,
Wavelength-modulated system of the present invention has following characteristics: 1. export in modulated process and keep without mode hopping single-frequency; 2. modulated structure is the spring-quality system optimized, and have structure simple, flexible design, modulating characteristic is constant at different frequencies, the advantages such as good reliability.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of the present invention.
Fig. 2 is the spring-quality system schematic diagram explaining the principle of the invention.
Fig. 3 is the characteristic curve schematic diagram of spring-quality system.
Fig. 4 is wavelength-modulated-frequency characteristics schematic diagram.
Mark in figure: single frequency optical fiber laser 1 continuously, vibration chamber tensioning system 2, band tail optical fiber semiconductor pump laser 3, optical-fiber bundling device (combiner or WDM) 4, high reflectance Fiber Bragg Grating FBG 5, highly doped gain fibre 6, antiradar reflectivity Fiber Bragg Grating FBG 7, laser base 8, piezoelectric element 9, piezoelectric element control system 10, vibration chamber stretching bar 11, stretching bar movable end 12.In Fig. 2: quality 201 pairs of strain stretch bar movable ends 12, spring 202 pairs of strain stretch bars 11,203 are that periodically the corresponding piezoelectric element 9,204 of applied force is the corresponding laser base 8 of fixing point of simple spring-quality system.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of without mode hopping Rapid wavelength modulation single frequency optical fiber laser, comprise continuous single frequency optical fiber laser 1 and wavelength-modulated system 2 two parts.
A. single-frequency jointed fiber laser 1
Comprise: the pumping semiconductor laser 3 of (see figure 1) band tail optical fiber, its output tail optical fiber is connected to the pumping input port of optical-fiber bundling device 4, and the output optical fibre port of optical-fiber bundling device 4 connects high anti-Fiber Bragg Grating FBG 5(and has center reflection wavelength
), the other end and the highly doped gain fibre 6 of grating weld together, the other end of highly doped gain fibre 6 with write the low anti-Fiber Bragg Grating FBG 7(be formed on polarization maintaining optical fibre there is center reflection wavelength
) weld mutually, low anti-Fiber Bragg Grating FBG 7 other end is the output of single frequency optical fiber laser 1.The anti-Fiber Bragg Grating FBG 5 of above-mentioned height, highly doped gain fibre 6, forms laser oscillation cavity after writing the low anti-Fiber Bragg Grating FBG 7 phase welding be formed on polarization maintaining optical fibre.For ensureing the single-frequency of laser, the length of laser oscillation cavity (5,6,7) must be less than 5 centimetres.Therefore highly doped gain fibre 6 is necessary for high-gain.
B. the wavelength and without mode hopping modulation of single frequency optical fiber laser
Fiber laser vibration chamber described above is by the anti-Fiber Bragg Grating FBG 5 of height, and highly doped gain fibre 6, writes the low anti-Fiber Bragg Grating FBG 7 be formed on polarization maintaining optical fibre and form.Bragg grating 5,7 reflect the incident light within the specific limits, have center reflection wavelength respectively
with
.The wavelength that laser produces must at Bragg grating 5, in the reflected range of 7.Wavelength must meet following formula simultaneously:
Formula 1
Wherein output wavelength is
,
with
for laser generation cavity length and refraction coefficient.
for integer.For single frequency laser, only have unique
corresponding
drop on
with
centered by reflected range within.What this condition can be similar to is expressed as:
Formula 2
When single frequency laser works, meet above formula
may change in time.This phenomenon is called as " mode hopping ".Mode hopping can cause laser fluctuation of service, and becomes non-single-frequency.Single frequency laser design must avoid mode hopping as far as possible.It can thus be appreciated that, when single frequency laser modulation wavelength, must ensure that for avoiding mode hopping the change of above three wavelength value is also equal.So:
Formula 3
The wavelength of grating is by following formulae express:
Formula 4
Wherein
with
be effective refractive index and the cycle of grating, 1,2 represent two gratings respectively.
Can draw the differentiate of above three wavelength formula:
Formula 5
Due to formula 2,
, with
numerical value be far longer than difference between them, in upper formula
, with
can be considered to equal.If ensure following condition when modulation wavelength, the change of three wavelength also can be equal, thus can realize without mode hopping modulation:
Formula 6
Formula 7
Above formula can be expressed as following:
The vibrate variations in refractive index percentage of chamber (5,6,7) three parts of condition 1. is equal
The vibrate strain of change in size of chamber (5,6,7) three parts of condition 2. keeps evenly
More than derive and be applicable to any modulator approach.Conventional modulator approach comprises temperature, deformation and electrooptic modulation.The present invention is confined to stretching (the comprising compression) modulation of applying in deformation.
C. wavelength-modulated system
(see figure 1) wavelength-modulated system 2 of the present invention comprises laser base 8, piezoelectric element 9 and piezoelectric element control system 10.Wherein the telescopic direction of piezoelectric element 9 is horizontal direction.Laser base 8 devises two symmetrical stretching bars 11.Stretching bar 11 is parallel with the direction that piezoelectric element 9 stretches.When piezoelectric element 9 extends, stretching bar movable end 12 is open, thus realizes the stretching to stretching bar 11.Piezoelectric element 9 must be accomplished seamless with the combination of laser base 8, and stretching bar 11 will be in the predetermined state that is stretched when completing assembling, thus realizes quantitative precompressed to piezoelectric element 9.After wavelength-modulated system 2 has been assembled, vibration chamber (5,6,7) is fixed on strong adhesive in U-type groove that a stretching bar 11 is processed in advance.Ensure when being stretched (or compression) at stretching bar 11, same stretching (or compression) is experienced in vibration chamber (5,6,7).
Because stretching bar 11 is designed to part weak in system, have uniform cross section, in modulated process, flexible the causing of piezoelectric element 9 stretches to even (the waiting strain) of stretching bar 11, and above-mentioned formula 7 and condition 2 are met simultaneously.Form if vibration chamber (5,6,7) three parts are same material, in drawing process, formula 6 and above-mentioned condition 1 are also satisfied.If vibration chamber (5,6,7) three parts are different materials, whether condition 1 meets then needs by analysis or tests to determine.Because the reflection of grating (5,7) with
with
centered by have certain limit,
,
,
even if the change in is among a small circle unequal,
also can fall into
,
scope in.Just because of this, existing single frequency laser can realize wavelength and without mode hopping modulation among a small circle.Owing to this invention ensures that meeting of condition 2, greatly increase without mode hopping modulation range.
Often will to vibrate chamber (5 by the system of piezoelectric element modulation wavelength in the past, 6,7) a part, stretches as highly doped gain fibre 6 or antiradar reflectivity Fiber Bragg Grating FBG 7 are directly fixed on piezoelectric element 9, result is that the mechanical property of system is very complicated, especially under high modulation frequency.For realizing high-frequency stabilization modulation, in the past complicated mechanical system is become simple spring-quality system by the present invention, sees Fig. 2.Wherein quality 201 pairs of strain stretch bar movable ends 12.Its quality is
.Spring 202 pairs of strain stretch bars 11.2 stretching bars altogether, coefficient of elasticity is
.The effect of piezoelectric element 9 is reduced to the power 203 by just profound equation mechanical periodicity.204 is the fixing point of simple spring-quality system, corresponding laser base 8.
What Fig. 3 showed is the indicatrix being with the spring-quality system (Fig. 2) of decaying.Can see that displacement is not with frequency shift in frequency lower region 305.Then displacement raises with frequency increases, and when frequency is resonance frequency 306, displacement peaks.Then reduce with frequency.In order to increase applicable upper frequency limit, the target of design improves resonance frequency.Resonance frequency
computing formula be:
,
Wherein
for the coefficient of elasticity of spring,
for quality.
Resonance frequency to be improved as can be seen here in the design need to increase coefficient of elasticity
, reduce quality
.Frequency modulation(FM) of the present invention completes at geostationary low frequency region 305.Can find out that, in this region when drive amplitude is identical, displacement amplitude does not change with modulating frequency.
What Fig. 4 showed is a kind of modulation characteristics curve realized of the present invention.Can see in low-frequency range wavelength-modulated amount not with frequency change.Available modulation frequency range is 0 ~ 6000Hz.Resonance frequency is about 10000Hz.As mentioned above, the present invention can regulate resonance frequency and modulation range by change piezoelectric element and Machine Design.
The invention has the advantages that it is applied to the wavelength and without mode hopping modulation realizing single-frequency full-optical-fiber laser, there is excellent modulating characteristic, reliable and stable.
Claims (6)
1. modulate single frequency optical fiber laser without mode hopping Rapid wavelength for one kind, comprise continuous single frequency optical fiber laser and wavelength-modulated system two parts, it is characterized in that single-frequency jointed fiber laser comprises: the pumping semiconductor laser of band tail optical fiber, its output tail optical fiber is connected to the pumping input port of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high anti-Fiber Bragg Grating FBG, the other end and the highly doped gain fibre of grating weld together, the other end of highly doped gain fibre with write the low anti-Fiber Bragg Grating FBG be formed on polarization maintaining optical fibre and weld mutually, the low anti-Fiber Bragg Grating FBG other end is the output of fiber laser, high anti-Fiber Bragg Grating FBG, highly doped gain fibre forms laser oscillation cavity with writing after the low anti-Fiber Bragg Grating FBG be formed on polarization maintaining optical fibre welds mutually, wavelength-modulated system comprises laser base, piezoelectric element and piezoelectric element control system, wherein the telescopic direction of piezoelectric element is horizontal direction, laser base devises two symmetrical stretching bars, stretching bar is parallel with the direction that piezoelectric element stretches, piezoelectric element and laser base seamless, vibration chamber strong adhesive is fixed on a stretching bar.
2. according to claim 1 a kind of without mode hopping Rapid wavelength modulation single frequency optical fiber laser, it is characterized in that the length of laser oscillation cavity must be less than 5 centimetres, highly doped gain fibre is high-gain.
3. according to claim 1 a kind of without mode hopping Rapid wavelength modulation single frequency optical fiber laser, it is characterized in that reflecting the incident light of Bragg grating has center reflection wavelength respectively
with
, the wavelength that laser produces
, wherein output wavelength is
,
with
for laser generation cavity length and refraction coefficient,
for integer, for single frequency laser, only have unique
corresponding
drop on with
centered by reflected range within, what this condition can be similar to is expressed as:
.
4. one according to claim 3 is without mode hopping Rapid wavelength modulation single frequency optical fiber laser, it is characterized in that, when single frequency laser modulation wavelength, the change of three wavelength value is also equal,
, the wavelength of grating:
,
Wherein
with
be effective refractive index and the cycle of grating, 1,2 represent two gratings respectively.
5. according to claim 4 a kind of without mode hopping Rapid wavelength modulation single frequency optical fiber laser, it is characterized in that the differentiate of three wavelength formula:
,
Due to formula 2,
, with
numerical value be far longer than difference between them, in upper formula
, with
be considered to equal, if ensure following condition when modulation wavelength, the change of three wavelength also can be equal, to realize modulating without mode hopping.
6. according to claim 1 a kind of without mode hopping Rapid wavelength modulation single frequency optical fiber laser, when the strain maintenance of the change in size of equal and vibration chamber three part of the variations in refractive index percentage of chamber three part that it is characterized in that vibrating is even,
;
.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117030198A (en) * | 2023-10-10 | 2023-11-10 | 成都明夷电子科技有限公司 | Laser mode-jump detector, detection method, electronic equipment and storage medium |
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|---|---|---|---|---|
| WO1994017366A1 (en) * | 1993-01-29 | 1994-08-04 | United Technologies Corporation | Active multipoint fiber laser sensor |
| CN102306897A (en) * | 2011-08-22 | 2012-01-04 | 华南理工大学 | Ultra narrow linewidth low noise high power single frequency fiber laser |
| CN103050874A (en) * | 2013-01-16 | 2013-04-17 | 山东海富光子科技股份有限公司 | High-power pulse type singe-frequency all-fiber laser system |
| CN103236631A (en) * | 2013-05-05 | 2013-08-07 | 山东海富光子科技股份有限公司 | Active Q-switching single-frequency optical fiber laser using rare earth-doped quartz optical fiber as gain medium |
| CN204230623U (en) * | 2014-12-15 | 2015-03-25 | 山东海富光子科技股份有限公司 | Without mode hopping Rapid wavelength modulation single frequency optical fiber laser |
-
2014
- 2014-12-15 CN CN201410769705.XA patent/CN104466649B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994017366A1 (en) * | 1993-01-29 | 1994-08-04 | United Technologies Corporation | Active multipoint fiber laser sensor |
| CN102306897A (en) * | 2011-08-22 | 2012-01-04 | 华南理工大学 | Ultra narrow linewidth low noise high power single frequency fiber laser |
| CN103050874A (en) * | 2013-01-16 | 2013-04-17 | 山东海富光子科技股份有限公司 | High-power pulse type singe-frequency all-fiber laser system |
| CN103236631A (en) * | 2013-05-05 | 2013-08-07 | 山东海富光子科技股份有限公司 | Active Q-switching single-frequency optical fiber laser using rare earth-doped quartz optical fiber as gain medium |
| CN204230623U (en) * | 2014-12-15 | 2015-03-25 | 山东海富光子科技股份有限公司 | Without mode hopping Rapid wavelength modulation single frequency optical fiber laser |
Non-Patent Citations (1)
| Title |
|---|
| 伍波;刘永智;刘爽;代志勇: "外腔选模单频环形腔掺铒光纤激光器" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117030198A (en) * | 2023-10-10 | 2023-11-10 | 成都明夷电子科技有限公司 | Laser mode-jump detector, detection method, electronic equipment and storage medium |
| CN117030198B (en) * | 2023-10-10 | 2023-12-22 | 成都明夷电子科技有限公司 | Laser mode-jump detector, detection method, electronic equipment and storage medium |
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