CN103151692B - 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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- CN103151692B CN103151692B CN201310043347.XA CN201310043347A CN103151692B CN 103151692 B CN103151692 B CN 103151692B CN 201310043347 A CN201310043347 A CN 201310043347A CN 103151692 B CN103151692 B CN 103151692B
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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 the multi-wavelength mid-infrared laser generating means based on PPLN and control method thereof, belong to laser technology field.
Background technology
Mid-infrared laser has a wide range of applications in fields such as optical sensing, detection and spectrum analyses.Research shows, many important gas molecules are (as CH
4, C
2h
4, CO, NH
3, NO
x, SO
xdeng) there is strong base band absorption in 3-5 micron middle-infrared band, its absorption intensity ratio is near infrared band height 2-3 order of magnitude.Because this type of base band absorbs the intrinsic fluorescent property that can reflect gas, there is fingerprint characteristic, therefore, the absorption spectroscopy techniques based on mid-infrared laser can realize the high sensitivity detection of the information such as gaseous species, concentration, has extremely important application in environmental monitoring field.Based on DFG(Difference Frequency Generation infrared in crystal second order nonlinear effect, difference frequency produces) LASER Light Source, because simple, the tuning convenience of its structure, room temperature operate and without good characteristics such as threshold restrictions, receive extensive concern.Particularly, along with proposition and the utilization of crystal external electric field poling method, based on QPM(Quasi Phase Matching, quasi-phase matched) infrared DFG light source obtains develop rapidly in technology, has become the main stream light sources of current gas spectral detection application.In recent years, for meeting the synchronous detection demand of multicomponent gas or one-component many characteristic spectral lines, in how making DFG light source realize, infrared multi-wavelength laser synchronization exports to cause and pays close attention to widely.
According to structure and the principle of DFG light source, realize multi-wavelength mid-infrared laser synchronism output, its key is the QPM tuning curve that design has multi-peaks structure.Through effort for many years, have already been proposed multiple method 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.But these methods are mainly 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 fabrication error of device are comparatively responsive.Moreover, such devices is once after crystal domain structure determines, the position at QPM peak (also i.e. mid-infrared laser wavelength) is 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 above-mentioned background technology, provides the multi-wavelength mid-infrared laser generating means based on PPLN and control method thereof.
The present invention adopts following technical scheme for achieving the above object:
Based on the multi-wavelength mid-infrared laser generating means of PPLN, comprising: signal source generator, wavelength division multiplexer, the first condenser lens, PPLN crystal, the second condenser lens, filter plate that the pumping source generator that wave band is 1060nm, wave band are 1550nm; Wherein:
The signal source generator output optical fibre that described wave band is the pumping source generator output optical fibre of 1060nm, wave band is 1550nm connects wavelength division multiplexer respectively;
Described wavelength division multiplexer output light path is disposed with the first condenser lens, PPLN crystal, the second condenser lens, filter plate.
Described based in the multi-wavelength mid-infrared laser generating means of PPLN, wave band is that the pumping source generator of 1060nm comprises: 1060nm band laser, the first fiber amplifier, array waveguide grating that 2N array is arranged, and N is natural number, wherein:
Described array waveguide grating is arranged on 1060nm band laser output light path;
After described first fiber amplifier is arranged on array waveguide grating.
It is described that based in the multi-wavelength mid-infrared laser generating means of PPLN, wave band is that the signal source generator of 1550nm comprises: 1550nm band laser, the second fiber amplifier, wherein:
After described second fiber amplifier is arranged on 1550nm band laser.
Described based in the multi-wavelength mid-infrared laser generating means of PPLN, 1060nm band laser is the LD laser of 1060nm wave band, and described 1550nm band laser is the LD laser of 1550nm wave band..
The control method of the described multi-wavelength mid-infrared laser generating means based on PPLN, PPLN crystal is divided into N number of control section, each control section posts Peltier, 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 of wave band to be pump light, wave band that the pumping source generator of 1060nm produces be 1550nm fix flashlight enter after wavelength division multiplexer closes ripple, PPLN crystal is entered again, synchronism output mid-infrared laser spectral line by condenser lens;
Step 2, the temperature of each control section of setting PPLN crystal, based on QPM principle determination pump light QPM peak position;
Step 3, according to the pump light QPM peak position that step 2 is determined, the output wavelength arranging 2N 1060nm band laser respectively, to meet QPM condition, utilizes FTIS to analyze the described laser line exported based on the multi-wavelength mid-infrared laser generating means of PPLN;
Step 4, changes the temperature of PPLN crystal control section, repeats step 2 to step 3, obtains the tuning operation of multi-wavelength mid-infrared laser.
The present invention adopts technique scheme, has following beneficial effect: the tuning operation on a large scale that only need can be realized multiwavelength laser by the temperature changing PPLN subsegment crystal.According to practical application, needing, segmentation crystal temperature effect is set flexibly and be in target position of spectral line to make mid-infrared laser wavelength, overcome the inferior position that existing method middle infrared wavelength cannot be tuning on a large scale.
Accompanying drawing explanation
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 illustrates: 1, wave band is the pumping source generator of 1060nm, 11,1060nm band laser, and the 12, first fiber amplifier, 13, array waveguide grating, 2, wave band is the signal source generator of 1550nm, 21,1550nm 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, Peltier, 9, temperature controller, 10, FTIS.
Fig. 2 is signal source generator output wavelength is 1.58 μm, and PPLN crystal temperature effect control section is 20
oduring C, in infrared normalization output spectra.
Fig. 3 is signal source generator output wavelength is 1.58 μm, and PPLN crystal temperature effect control section is 60
oduring C, in infrared normalization output spectra.
Fig. 4 is signal source generator output wavelength is 1.58 μm, and PPLN crystal temperature effect control section is respectively 20
oC, 60
oduring C, in infrared normalization output spectra.
Fig. 5 is signal source generator output wavelength is 1.58 μm, and PPLN crystal temperature effect control section is respectively 20
oC, 90
oduring C, in infrared normalization output spectra.
Fig. 6 is signal source generator output wavelength is 1.58 μm, and PPLN crystal temperature effect control section is respectively 20
oC, 128.3
oduring C, in infrared normalization output spectra.
Fig. 7 is signal source generator output wavelength is 1.60 μm, and PPLN crystal temperature effect control section is 20
oduring C, in infrared normalization output spectra.
Embodiment
Be described in detail 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: the signal source generator 2 that the pumping source generator 1 that wave band is 1060nm, wave band are 1550nm, wavelength division multiplexer 3, first condenser lens 4, PPLN crystal 5, second condenser lens 6, filter plate 7.Signal source generator 2 output optical fibre that wave band is pumping source generator 1 output optical fibre of 1060nm, wave band is 1550nm connects wavelength division multiplexer 3 respectively.Wavelength division multiplexer 3 output light path is disposed with the first condenser lens 4, PPLN crystal 5, second condenser lens 6, filter plate 7.
Wave band is that the pumping source generator 1 of 1060nm comprises: 1060nm band laser 11, first fiber amplifier 12 that 2N array is arranged, array waveguide grating 13, N are for being greater than 1 natural number.Array waveguide grating 13 is arranged on 1060nm band laser 11 output light path, 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, second fiber amplifier 22.After 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.1060nm band laser may also be the laser that other wave band is 1060nm, as EDFL(Erbium Doped Field Laser, and erbium doped fiber laser).The laser of 1550nm band laser 21 also can be other wave band be 1550nm, as YDFL(Ytterbium Doped Field Laser, ytterbium-doping optical fiber laser).
In fact, QPM condition is not only subject to the impact of device polarization structure, also closely related with the temperature of crystal.The present invention is directed to 1060nm band laser and 1550nm band laser proposes 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(long × wide × high), polarization cycle is the PPLN crystal of 30 μm.PPLN crystal 5 is divided into 2 control sections, represents the temperature of PPLN crystal two temperature controlled section with T1, T2; Each control section is posted Peltier 8, and Peltier peak power output is 16W, and temperature control precision is ± 0.1
oc; Temperature controller 9 is connected with each control section, controls, realize the output of multi-wavelength mid-infrared laser spectral line, specifically comprise the steps: PPLN crystal 5 carrying out step by step temperature
Step 1, pump light, wave band that wave band 1060nm pumping source generator 1 produces to be signal source generator 2 output wavelength of 1550nm be 1.58 μm flashlight enter after wavelength division multiplexer 3 closes ripple, PPLN crystal 5 is entered again, synchronism output 2 mid-infrared laser spectral lines by condenser lens;
Step 2, the temperature of each control section of setting PPLN crystal 5, based on QPM principle determination pump light QPM peak position;
Step 3, according to the pump light QPM peak position that step 2 is determined, the output wavelength arranging 2N 1060nm band laser 11 respectively, to meet QPM condition, utilizes FTIS 10 to analyze the described laser line exported based on the multi-wavelength mid-infrared laser generating means of PPLN;
Step 4, changes the temperature of PPLN crystal 5 control section, repeats step 2 to step 3, obtains tunable 2N mid-infrared laser spectral line and exports.
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 2.95 μm and 3.83 μm respectively.Therefore, wavelength only need be adopted to be respectively 1.029 μm and 1.098 μm of YDFL can obtain the output of dual wavelength mid-infrared laser as pump light.When crystal temperature effect changes, can there is translation in dual wavelength position.As shown in Figure 3, T1=T2=60 is worked as
oc, middle infrared double-wave length position moves to 3.03 μm and 3.75 μm of places respectively, and the pump wavelength that correspondence meets QPM condition is respectively 1.038 μm and 1.112 μm.
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 a PPLN temperature controlled section, therefore occurred 4 QPM peaks in total output spectra, its position is respectively: 2.95 μm, 3.03 μm, 3.75 μm and 3.83 μm.When the normalization output amplitude of each bar spectral line is reduced to non-segmentation respective value 25%.When T2 rises to 90
oduring C, in infrared normalization output spectra as shown in Figure 5.Now, two QPM peaks (3.03 μm and 3.75 μm) that temperature T2 control section is corresponding move to 3.11 μm and 3.67 μm of places respectively.
As can be seen from Fig. 4 and Tu, when crystal temperature effect raises gradually, two QPM peak is drawn close to center gradually.As shown in Figure 6, when one of them temperature controlled section temperature is increased to 128.3
oduring C, two QPM peak has completely overlapped QPM peak, formation one broadband (3.26 μm ~ 3.51 μm), and the pump wavelength scope of its correspondence is 1.064 ~ 1.089 μm.The pump light be in this wave-length coverage all can obtain effective difference frequency and export.
Fig. 7 is flashlight output wavelength when being fixed as 1.60 μm, and crystal temperature effect is set to T1=T2=20
oduring C, infrared normalization exports spectral line.Now the position of two QPM is in 2.85 μm and 3.92 μm of places respectively, in infrared coverage comparatively the former is greatly improved.Therefore, flashlight output wavelength is larger, in infrared coverage larger.
If it is pointed out that mid-infrared laser generating means synchronism output six laser lines, only PPLN crystal need be divided into three temperature controlled section, adopt 6 YDFL pump lights to realize.By that analogy, if need mid-infrared laser generating means to export 2N laser line, only crystal need be divided into N number of temperature and control subsegment, adopt 2N YDFL pump light to realize.Control method is not only applicable to take ytterbium-doping optical fiber laser as pumping source, be signal source based on infrared generator in PPLN with erbium-doped fiber laser, be pumping source for the laser being 1060nm with other wave band, what the laser being 1550nm with other wave band was signal source is applicable equally based on infrared generator in PPLN.
In sum, the present invention only need can realize the tuning operation on a large scale of multiwavelength laser by the temperature changing PPLN subsegment crystal.Utilize this characteristic, according to practical application, can needing, segmentation crystal temperature effect is set flexibly and be in target position of spectral line to make mid-infrared laser wavelength, overcome the inferior position that existing method middle infrared wavelength cannot be tuning on a large scale.
Claims (1)
1. based on the control method of the multi-wavelength mid-infrared laser generating means of PPLN,
The described multi-wavelength mid-infrared laser generating means based on PPLN comprises: signal source generator (2), wavelength division multiplexer (3), the first condenser lens (4), PPLN crystal (5), the second condenser lens (6), filter plate (7) that the pumping source generator (1) that wave band is 1060nm, wave band are 1550nm; Wherein: signal source generator (2) output optical fibre that described wave band is pumping source generator (1) output optical fibre of 1060nm, wave band is 1550nm connects wavelength division multiplexer (3) respectively, described wavelength division multiplexer (3) output light path is disposed with the first condenser lens (4), PPLN crystal (5), the second condenser lens (6), filter plate (7)
Described wave band is that the pumping source generator (1) of 1060nm comprises: 1060nm band laser (11), the first fiber amplifier (12), array waveguide grating (13) that 2N array is arranged, N is natural number, wherein: described array waveguide grating (13) is arranged on 1060nm band laser (11) output light path; After described first fiber amplifier (12) is arranged on array waveguide grating (13),
Described wave band is that the signal source generator (2) of 1550nm comprises: 1550nm band laser (21), the second fiber amplifier (22), wherein: after described second fiber amplifier (22) is arranged on 1550nm band laser (21)
The LD laser that described 1060nm band laser (11) is 1060nm wave band, the LD laser that described 1550nm band laser (21) is 1550nm wave band;
It is characterized in that, PPLN crystal (5) is divided into N number of control section, each control section is posted Peltier (8), 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, described control method specifically comprises the steps:
Step 1, the fixing flashlight of signal source generator (2) output wavelength of wave band to be pump light, wave band that the pumping source generator (1) of 1060nm produces be 1550nm enters after wavelength division multiplexer (3) closes ripple, PPLN crystal (5) is entered again, synchronism output mid-infrared laser spectral line by condenser lens;
Step 2, the temperature of each control section of setting PPLN crystal, based on QPM principle determination pump light QPM peak position;
Step 3, according to the pump light QPM peak position that step 2 is determined, the output wavelength arranging 2N 1060nm band laser (11) respectively, to meet QPM condition, utilizes FTIS to analyze the described laser line exported based on the multi-wavelength mid-infrared laser generating means of PPLN;
Step 4, changes the temperature of PPLN crystal control section, repeats step 2 to step 3, obtains the tuning operation of multi-wavelength mid-infrared laser.
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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 |
| CN104836111B (en) * | 2015-05-25 | 2018-08-24 | 厦门大学 | Wideband adjustable narrow linewidth mid-infrared laser source |
| CN113126387B (en) * | 2021-03-10 | 2023-01-13 | 电子科技大学 | All-optical tunable multi-channel filter based on periodic polarization type lithium niobate crystal |
| 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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| CN101504507A (en) * | 2008-12-31 | 2009-08-12 | 中国科学院安徽光学精密机械研究所 | Optical fiber type mid-IR laser source generated by 3-5micrometre continuous wave differential frequency and its implementing method |
| CN203119288U (en) * | 2013-02-05 | 2013-08-07 | 南京信息工程大学 | Multi-wavelength mid infrared laser generating device based on PPLN (Periodically Poled Lithium Niobate) |
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| CN101504507A (en) * | 2008-12-31 | 2009-08-12 | 中国科学院安徽光学精密机械研究所 | Optical fiber type mid-IR laser source generated by 3-5micrometre continuous wave differential frequency and its implementing method |
| CN203119288U (en) * | 2013-02-05 | 2013-08-07 | 南京信息工程大学 | Multi-wavelength mid infrared laser generating device based on PPLN (Periodically Poled Lithium Niobate) |
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| 基于光纤激光器的中红外差频多波长激光产生;蒋建等;《物理学报》;20101130;第59卷(第11期);第7892-7898页 * |
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