CN103151692A - Multi-wavelength intermediate infrared laser generation device based on periodically poled lithium niobate (PPLN) and control method thereof - Google Patents
Multi-wavelength intermediate infrared laser generation device based on periodically poled lithium niobate (PPLN) and control method thereof Download PDFInfo
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- CN103151692A CN103151692A CN201310043347XA CN201310043347A CN103151692A CN 103151692 A CN103151692 A CN 103151692A CN 201310043347X A CN201310043347X A CN 201310043347XA CN 201310043347 A CN201310043347 A CN 201310043347A CN 103151692 A CN103151692 A CN 103151692A
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Abstract
The invention discloses a multi-wavelength intermediate infrared laser generation device based on periodically poled lithium niobate (PPLN) and a control method thereof, and belongs to the field of laser technology. The multi-wavelength intermediate infrared laser generation device based on the PPLN comprises a pumping source generator, a signal source generator, a wavelength division multiplexer, a first focusing lens, a PPLN crystal, a second focusing lens, and a filter. The control method carries out sectional temperature control for the PPLN crystal, achieves generation and regulation for a multiple quasi-phase-matching (QPM) peak, then determines a fundamental frequency laser wavelength according to a quasi-phase matching principle, and obtains multi-wavelength intermediate infrared laser synchrotron radiation. According to the multi-wavelength intermediate infrared laser generation device and the control method, wide-range tuning output of multi-wavelength laser can be achieved just through changing of the temperatures of PPLN subsegment crystals; and according to actual application requirements, the temperatures of the subsegment crystals need to be flexibly set to enable the intermediate infrared laser wavelength to be in a target spectral line position, and the defect that the intermediate infrared wavelength cannot be in wide-range tuning in an existing method is overcome.
Description
Technical field
The invention discloses multi-wavelength mid-infrared laser generating means and control method thereof based on PPLN, belong to laser technology field.
Background technology
Mid-infrared laser has in fields such as optical sensing, detection and spectrum analyses widely to be used.Studies show that, many important gas molecules are (as CH
4, C
2H
4, CO, NH
3, NO
x, SO
xDeng) exist strong base band to absorb in 3-5 micron middle-infrared band, its absorption intensity ratio is at the high 2-3 of a near infrared band order of magnitude.Absorb the intrinsic fluorescent property that can reflect gas due to this type of base band, has fingerprint characteristic, therefore, can realize the high sensitivity detection of the information such as gaseous species, concentration based on the absorption spectroscopy techniques of mid-infrared laser, have extremely important application in the environmental monitoring field.Based on infrared DFG(Difference Frequency Generation in the crystal second order nonlinear effect, difference frequency produces) LASER Light Source, because its simple in structure, tuning convenience, room temperature turn round and without good characteristics such as threshold value restrictions, be subject to extensive concern.Particularly, along with proposition and the utilization of crystal extra electric field polarization method, based on QPM(Quasi Phase Matching, accurate phase matched) technology in infrared DFG light source obtained develop rapidly, become current gaseous spectrum and detected the main stream light sources of using.In recent years, for satisfying the synchronous detection demand of multicomponent gas or many characteristic spectral lines of one-component, how to make the DFG light source realize in the output of infrared multi-wavelength laser synchronization caused widely and paid close attention to.
According to structure and the principle of DFG light source, realize that the multi-wavelength mid-infrared laser synchronously exports, its key is the QPM tuning curve that design has multi-peaks structure.Through effort for many years, people have proposed several different methods to obtain the QPM curve of multi-peaks structure, as PRS(Phase Inversion Sequence, phasing back sequence) technology, ASO(Aperiodic Optical Superlattices, aperiodic optical superlattice) technology,
Sinusoidal phase modulation and Continuous Phase Modulation technology etc.Yet these methods mainly are devoted to the novel crystal domain structure of design and optimization, have that manufacture difficulty is large, cost is high and QPM tuning curve shape to problems such as the making error of device are comparatively responsive.Moreover, in case after the domain structure of such devices crystal was determined, the position (being also the mid-infrared laser wavelength) at QPM peak was thereupon corresponding fixing, is difficult to tuning on a large scale.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for the above-mentioned background technology, and multi-wavelength mid-infrared laser generating means and control method thereof based on PPLN are provided.
The present invention adopts following technical scheme for achieving the above object:
Multi-wavelength mid-infrared laser generating means based on PPLN comprises: wave band is the pumping source generator of 1060nm, signal source generator, wavelength division multiplexer, the first condenser lens, PPLN crystal, the second condenser lens, the filter plate that wave band is 1550nm; Wherein:
Described wave band is that the pumping source generator output optical fibre of 1060nm, the signal source generator output optical fibre that wave band is 1550nm connect respectively wavelength division multiplexer;
Be disposed with the first condenser lens, PPLN crystal, the second condenser lens, filter plate on described wavelength division multiplexer output light path.
In described multi-wavelength mid-infrared laser generating means based on PPLN, wave band is that the pumping source generator of 1060nm comprises: 2N 1060nm band laser, the first fiber amplifier, the array waveguide grating that array arranges, and N is natural number, wherein:
Described array waveguide grating is arranged on 1060nm band laser output light path;
After described the first fiber amplifier is arranged on array waveguide grating.
In described multi-wavelength mid-infrared laser generating means based on PPLN, wave band is that the signal source generator of 1550nm comprises: 1550nm band laser, the second fiber amplifier, wherein:
After described the second fiber amplifier is arranged on the 1550nm band laser.
In described multi-wavelength mid-infrared laser generating means based on PPLN, the 1060nm band laser is the LD laser of 1060nm wave band, the LD laser that described 1550nm band laser is the 1550nm wave band..
The control method of described multi-wavelength mid-infrared laser generating means based on PPLN, the PPLN crystal is divided into N control section, posting Po Er on each control section pastes, temperature controller is connected with each control section, PPLN crystal carrying out step by step temperature is controlled, realize the output of multi-wavelength mid-infrared laser spectral line, specifically comprise the steps:
Step 1, the signal source generator output wavelength that wave band is the pump light that produces of the pumping source generator of 1060nm, wave band is 1550nm fixing flashlight enter wavelength division multiplexer and close ripple after, enter the PPLN crystal by condenser lens again, synchronously export the mid-infrared laser spectral line;
The present invention adopts technique scheme, has following beneficial effect: the tuning operation on a large scale that only needs can realize by the temperature that changes PPLN subsegment crystal multiwavelength laser.The segmentation crystal temperature effect is set flexibly so that the mid-infrared laser wavelength is in the target position of spectral line according to the practical application needs, has overcome can't be the on a large scale tuning inferior position of existing method middle infrared wavelength.
Description of drawings
Fig. 1 is the schematic diagram of the multi-wavelength mid-infrared laser generating means based on PPLN of the present invention.Number in the figure explanation: 1, wave band is the pumping source generator of 1060nm, 11, the 1060nm band laser, and the 12, first fiber amplifier, 13, array waveguide grating, 2, wave band is the signal source generator of 1550nm, 21, the 1550nm band laser, 22, the second fiber amplifier, 3, wavelength division multiplexer, the 4, first condenser lens, 5, PPLN crystal, 6, the second condenser lens, 7, filter plate, 8, Po Er pastes, 9, temperature controller, 10, FTIS.
Fig. 2 is that the signal source generator output wavelength is 1.58 μ m, and PPLN crystal temperature effect control section is 20
oDuring C, in infrared normalization output spectra.
Fig. 3 is that the signal source generator output wavelength is 1.58 μ m, and PPLN crystal temperature effect control section is 60
oDuring C, in infrared normalization output spectra.
Fig. 4 is that the signal source generator output wavelength is 1.58 μ m, and PPLN crystal temperature effect control section is respectively 20
oC, 60
oDuring C, in infrared normalization output spectra.
Fig. 5 is that the signal source generator output wavelength is 1.58 μ m, and PPLN crystal temperature effect control section is respectively 20
oC, 90
oDuring C, in infrared normalization output spectra.
Fig. 6 is that the signal source generator output wavelength is 1.58 μ m, and PPLN crystal temperature effect control section is respectively 20
oC, 128.3
oDuring C, in infrared normalization output spectra.
Fig. 7 is that the signal source generator output wavelength is 1.60 μ m, and PPLN crystal temperature effect control section is 20
oDuring C, in infrared normalization output spectra.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention.
As shown in Figure 1, the multi-wavelength mid-infrared laser generating means based on PPLN comprises: wave band is the pumping source generator 1 of 1060nm, signal source generator 2, wavelength division multiplexer 3, the first condenser lens 4, PPLN crystal 5, the second condenser lens 6, the filter plate 7 that wave band is 1550nm.Wave band is that pumping source generator 1 output optical fibre of 1060nm, signal source generator 2 output optical fibres that wave band is 1550nm connect respectively wavelength division multiplexer 3.Be disposed with the first condenser lens 4, PPLN crystal 5, the second condenser lens 6, filter plate 7 on wavelength division multiplexer 3 output light paths.
Wave band is that the pumping source generator 1 of 1060nm comprises: 2N 1060nm band laser 11, the first fiber amplifier 12, the array waveguide grating 13 that array arranges, N is greater than 1 natural number.Array waveguide grating 13 is arranged on 1060nm band laser 11 output light paths, after the first fiber amplifier 12 is arranged on array waveguide grating 13.
Wave band is that the signal source generator 2 of 1550nm comprises: 1550nm band laser 21, the second fiber amplifier 22.After the second fiber amplifier 22 is arranged on 1550nm band laser 21.
1060nm band laser 11 is the LD laser of 1060nm wave band, and 1550nm band laser 21 is the LD laser of 1550nm wave band.The 1060nm band laser also other wave band be the laser of 1060nm, as EDFL(Erbium Doped Field Laser, erbium doped fiber laser).1550nm band laser 21 can be also that other wave band is the laser of 1550nm, as YDFL(Ytterbium Doped Field Laser, ytterbium-doping optical fiber laser).
In fact, the QPM condition not only is subject to the impact of device polarization structure, and is also closely related with the temperature of crystal.The present invention is directed to 1060nm band laser and 1550nm band laser has proposed a kind of based on PPLN(Periodically Poling Lithium Niobate, periodically poled lithium niobate) the control method of multi-wavelength mid-infrared laser generating means.
Select 4 ytterbium-doping optical fiber lasers; An erbium doped fiber laser; Be of a size of 50 * 1 * 1mm(length * wide * height), polarization cycle is the PPLN crystal of 30 μ m.The PPLN crystal 5 is divided into 2 control sections, represents the temperature of two temperature control sections of PPLN crystal with T1, T2; Posting Po Er subsides 8, Po Er subsides peak power output on each control section is 16W, and temperature control precision is ± 0.1
oC； Temperature controller 9 is connected with each control section, and PPLN crystal 5 carrying out step by step temperature is controlled, and realizes the output of multi-wavelength mid-infrared laser spectral line, specifically comprises the steps:
Step 1, the pump light that wave band 1060nm pumping source generator 1 produces, signal source generator 2 output wavelengths that wave band is 1550nm be 1.58 μ m flashlight enter wavelength division multiplexer 3 and close ripple after, enter the PPLN crystal 5 by condenser lens again, synchronously export 2 mid-infrared laser spectral lines;
Work as T1=T2=20
oDuring C, its normalized QPM tuning curve as shown in Figure 2.As seen from Figure 2, this tuning curve has two QPM peaks in middle-infrared band, and its position is in respectively 2.95 μ m and 3.83 μ m.Therefore, only need to adopt a wavelength to be respectively 1.029 μ m and 1.098 μ m YDFL can obtain the output of dual wavelength mid-infrared laser as pump light.When crystal temperature effect changed, translation can occur in the dual wavelength position.As shown in Figure 3, work as T1=T2=60
oC, middle infrared double-wave length position moves to respectively 3.03 μ m and 3.75 μ m places, and the pump light wavelength that correspondence satisfies the QPM condition is respectively 1.038 μ m and 1.112 μ m.
Fig. 4 is T1=20, T2=60
oDuring C, in infrared normalization output spectra.As shown in Figure 4, due to corresponding two the QPM peaks of PPLN temperature control section, occurred 4 QPM peaks in therefore total output spectra, its position is respectively: 2.95 μ m, 3.03 μ m, 3.75 μ m and 3.83 μ m.When the normalization output amplitude of each spectral line is reduced to not segmentation 25% of respective value.When T2 rises to 90
oDuring C, in infrared normalization output spectra as shown in Figure 5.At this moment, two QPM peak (3.03 μ m and 3.75 μ m) corresponding to temperature T 2 control sections moves to respectively 3.11 μ m and 3.67 μ m places.
Can be found out by Fig. 4 and Tu, when crystal temperature effect raise gradually, two QPM drew close to the center at the peak gradually.As shown in Figure 6, be increased to 128.3 when one of them temperature control section temperature
oDuring C, two QPM peak has fully overlapped and has formed a QPM peak, broadband (3.26 μ m ~ 3.51 μ m), and its corresponding pump light wave-length coverage is 1.064 ~ 1.089 μ m.The pump light that is in this wave-length coverage all can obtain effective difference frequency output.
Fig. 7 is flashlight output wavelength when being fixed as 1.60 μ m, and crystal temperature effect is set to T1=T2=20
oInfrared normalization output spectral line in during C.This moment, the position of two QPM was in respectively 2.85 μ m and 3.92 μ m places, in infrared coverage be greatly improved than the former.Therefore, the flashlight output wavelength is larger, in infrared coverage larger.
If it is pointed out that six laser lines of the synchronous output of mid-infrared laser generating means, only need the PPLN crystal is divided into three temperature control sections, adopts 6 YDFL pump lights to realize.By that analogy, if need 2N laser line of mid-infrared laser generating means output, only need that crystal is divided into N temperature and control subsegment, adopt 2N YDFL pump light to realize.Control method not only is applicable to take ytterbium-doping optical fiber laser as pumping source, the middle infrared generator based on PPLN take the erbium-doped fiber laser as signal source, be pumping source for the laser take other wave band as 1060nm, the laser take other wave band as 1550nm as the middle infrared generator based on PPLN of signal source applicable equally.
In sum, the present invention only needs can realize by the temperature that changes PPLN subsegment crystal the tuning operation on a large scale of multiwavelength laser.Utilize this characteristic, can the segmentation crystal temperature effect be set flexibly so that the mid-infrared laser wavelength is in the target position of spectral line according to the practical application needs, overcome can't be the on a large scale tuning inferior position of existing method middle infrared wavelength.
Claims (5)
1. based on the multi-wavelength mid-infrared laser generating means of PPLN, it is characterized in that comprising: wave band is the pumping source generator (1) of 1060nm, signal source generator (2), wavelength division multiplexer (3), the first condenser lens (4), PPLN crystal (5), the second condenser lens (6), the filter plate (7) that wave band is 1550nm; Wherein:
Described wave band is that pumping source generator (1) output optical fibre of 1060nm, signal source generator (2) output optical fibre that wave band is 1550nm connect respectively wavelength division multiplexer (3);
Be disposed with the first condenser lens (4), PPLN crystal (5), the second condenser lens (6), filter plate (7) on described wavelength division multiplexer (3) output light path.
2. the multi-wavelength mid-infrared laser generating means based on PPLN according to claim 1, it is characterized in that: described wave band is that the pumping source generator (1) of 1060nm comprising: 2N 1060nm band laser (11), the first fiber amplifier (12), the array waveguide grating (13) that array arranges, N is natural number, wherein:
Described array waveguide grating (13) is arranged on 1060nm band laser (11) output light path;
Described the first fiber amplifier (12) is arranged on array waveguide grating (13) afterwards.
3. the multi-wavelength mid-infrared laser generating means based on PPLN according to claim 2, it is characterized in that: described wave band is that the signal source generator (2) of 1550nm comprising: 1550nm band laser (21), the second fiber amplifier (22), wherein:
Described the second fiber amplifier (22) is arranged on 1550nm band laser (21) afterwards.
4. the multi-wavelength mid-infrared laser generating means based on PPLN according to claim 3, it is characterized in that: described 1060nm band laser (11) is the LD laser of 1060nm wave band, and described 1550nm band laser (21) is the LD laser of 1550nm wave band..
5. the control method of according to claim 3 or 4 described multi-wavelength mid-infrared laser generating meanss based on PPLN, it is characterized in that PPLN crystal (5) is divided into N control section, post Po Er and paste (8) on each control section, temperature controller (9) is connected with each control section, PPLN crystal (5) carrying out step by step temperature is controlled, realize the output of multi-wavelength mid-infrared laser spectral line, specifically comprise the steps:
Step 1, signal source generator (2) output wavelength that wave band is the pump light that produces of the pumping source generator (1) of 1060nm, wave band is 1550nm fixing flashlight enter wavelength division multiplexer (3) and close ripple after, enter PPLN crystal (5) by condenser lens again, synchronously export the mid-infrared laser spectral line;
Step 2, the temperature of each control section of setting PPLN crystal is determined pump light QPM peak position based on the QPM principle;
Step 3, according to the definite pump light QPM peak position of step 2, the output wavelength of 2N 1060nm band laser (11) is set respectively to satisfy the QPM condition, utilizes FTIS to analyze the described laser line of exporting based on the multi-wavelength mid-infrared laser generating means of PPLN;
Step 4, the temperature of change PPLN crystal control section, repeating step 2 obtains the tuning operation of multi-wavelength mid-infrared laser to step 3.
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Cited By (4)
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| CN103825182A (en) * | 2013-11-11 | 2014-05-28 | 南京信息工程大学 | Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus |
| CN104836111A (en) * | 2015-05-25 | 2015-08-12 | 厦门大学 | Broadband tunable narrow linewidth intermediate-infrared laser source |
| CN113126387A (en) * | 2021-03-10 | 2021-07-16 | 电子科技大学 | All-optical tunable multi-channel filter based on periodic polarization type lithium niobate crystal |
| CN113776665A (en) * | 2021-09-07 | 2021-12-10 | 中国电子科技集团公司第四十一研究所 | Detection efficiency testing device and method for single photon detector in communication waveband |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825182A (en) * | 2013-11-11 | 2014-05-28 | 南京信息工程大学 | Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus |
| CN104836111A (en) * | 2015-05-25 | 2015-08-12 | 厦门大学 | Broadband tunable narrow linewidth intermediate-infrared laser source |
| CN113126387A (en) * | 2021-03-10 | 2021-07-16 | 电子科技大学 | All-optical tunable multi-channel filter based on periodic polarization type lithium niobate crystal |
| CN113776665A (en) * | 2021-09-07 | 2021-12-10 | 中国电子科技集团公司第四十一研究所 | Detection efficiency testing device and method for single photon detector in communication waveband |
| CN113776665B (en) * | 2021-09-07 | 2023-11-21 | 中国电子科技集团公司第四十一研究所 | Device and method for testing detection efficiency of single photon detector in communication band |
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