CN103825182A - Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus - Google Patents
Control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus Download PDFInfo
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- CN103825182A CN103825182A CN201310553740.3A CN201310553740A CN103825182A CN 103825182 A CN103825182 A CN 103825182A CN 201310553740 A CN201310553740 A CN 201310553740A CN 103825182 A CN103825182 A CN 103825182A
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Abstract
The invention discloses a control method for broad tuning intermediate infrared difference frequency generation laser generation apparatus and belongs to the technical filed of laser. According to the method, QPM wavelength acceptation bandwidth of an intermediate infrared idler frequency light is greatly improved through increasing temperature gradient at the two ends of PPLN crystal. Under the premise of keeping the temperature gradient at the two ends of the PPLN crystal, the position of the idler frequency light QPM band can be offset by adjusting temperature at the initiating terminal and end terminal of the PPLN crystal, and finally broad tuning intermediate infrared laser output is obtained.
Description
Technical field
The control method that the invention discloses infrared difference frequency generation generating device of laser in a kind of broad tuning, belongs to laser technology field.
Background technology
3-5 mu m waveband continuous wave tunable mid-infrared laser light source has important application in Trace gas detection.So far, there is multiple mid-infrared light source based on different laser mechanisms of production, as quantum cascade laser, lead salt laser, color center laser, parametric oscillator etc.Wherein, accurate phase matched (QPM, Quasi Phase Matching) difference frequency generation (DFG, Difference Frequency Generation) mid-infrared light source facility simple in structure because having, tuning, line width and can room temperature running etc. advantage, become the main stream light sources of spectral detection application.For waiting the periodical poled crystal in cycle, in the accurate phase matching wavelengths of infrared ideler frequency light accept bandwidth and be conventionally about 6-10nm, only can cover the characteristic absorption peak of minute quantity gas.For meeting multicomponent, the synchronous detection application demand of many absorption lines, in how widening, the tuning range of infrared DFG light source has been subject to people's extensive concern.In recent years, people adopt the periodical poled crystal of multicycle, sector structure or utilize the temperature dispersion characteristics of crystal, in the tuning range of infrared DFG light source can expand to more than 1 μ m.But, although these class methods can effectively be expanded the tuning range of DFG light source, in tuning process, need to be met to guarantee phase-matching condition in conjunction with the frequent switching of nonlinear crystal polarization cycle or crystal temperature effect, seriously reduce the service efficiency of LASER Light Source.In how realizing under fixing crystal domain structure and Temperature Distribution condition, the broad tuning running of infrared DFG light source is still worth further investigation, and its key is to widen QPM bandwidth.For this reason, the control method of some traditional grating spectrums as, the period polarized scheme warble, phase shift, block toe technology being applied to crystal in succession, the QPM bandwidth of infrared ideler frequency light in effectively having expanded, but in this simultaneously, technique preparation, the difficulty of experiment control and the cost of device are also greatly increased.
Result of study in recent years shows, for some non-linear cycle polarized crystal, as periodically poled lithium niobate crystal (PPLN, Periodically Poling Lithium Niobate), also can utilize the controlled dispersion characteristics of its temperature to realize the effective expansion to QPM bandwidth.Utilize this characteristic, for 1060 and the fundamental frequency combination of light sources of 1550nm wave band, this research group first in ideler frequency light QPM bandwidth is widened to about 170nm near infrared 3.4 μ m.In experiment, adopt multiwavelength Ytterbium-doped fiber laser (YDFL, Ytterbium Doped Fiber Laser) obtain the synchronous output of 14 mid-infrared laser spectral lines with single wavelength erbium doped fiber laser (EDFL, Erbium Doped Fiber Laser) difference frequency.But further research is found, the intrinsic dispersion of PPLN crystal make this ideler frequency light QPM band of widening can only be present near infrared 3.4 μ m, be difficult to other wavelength region may to realize effectively and covering.The temperature dispersion relation that the present invention is based on PPLN produces scheme by proposing infrared difference frequency in a kind of novel broadband.Utilize the control method of crystal temperature effect gradual change effectively to expand the QPM bandwidth of ideler frequency light, the BW of infrared ideler frequency light QPM band and the Effective Regulation of position thereof in realizing by the temperature at change crystal two ends.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for above-mentioned background technology, and the control method of infrared difference frequency generation generating device of laser in a kind of broad tuning is provided.
The present invention adopts following technical scheme for achieving the above object:
In a kind of broad tuning, infrared difference frequency produces the control method of generating device of laser, infrared difference frequency in broad tuning based on PPLN crystal is produced to generating device of laser and carry out temperature ramp control, realize the output of broad tuning mid-infrared laser spectral line, specifically comprise the steps:
Step 1, is placed in PPLN crystal in temperature controlling stove, and posting design temperature at temperature controlling stove initiating terminal, end end is that the Po Er of T1, T2 pastes temperature controller, and T1, T2 numerical value are not etc.;
Step 2, start the pumping source generator of 1060nm wave band fixed wave length, the tunable signal source generator that wave band is 1550nm, the pump light that described pumping source generator produces, the flashlight that signal source generator produces obtain mid-infrared laser spectral line through wavelength division multiplexer, lens, PPLN crystal;
Step 3, the design temperature T1, the T2 that are pasted temperature controller by temperature controlling stove initiating terminal, end end Po Er determine the QPM bandwidth of ideler frequency light, and then are produced the tuning range of principle picked up signal light by difference frequency;
Step 4, the output wavelength of tuning fundamental frequency signal light in definite flashlight tuning range, obtains tunable mid-infrared laser output;
Step 5, keeps the temperature gradient at PPLN crystal two ends, changes the design temperature of temperature controlling stove initial end, end end Po Er subsides temperature controller, and repeating step 3 to step 4 obtains tunable mid-infrared laser output corresponding to unlike signal magic eye scope.
In described a kind of broad tuning, infrared difference frequency produces the control method of generating device of laser, the temperature gradient at the PPLN crystal two ends described in step 5 obtains by the following method: keeping temperature controlling stove end end Po Er to paste under the prerequisite that the design temperature of temperature controller is constant, regulate temperature controlling stove initiating terminal Po Er to paste the design temperature of temperature controller, make temperature controlling stove initiating terminal, end end Po Er subsides temperature controller design temperature have difference.
In described a kind of broad tuning, infrared difference frequency produces the control method of generating device of laser, the temperature gradient at the PPLN crystal two ends described in step 5 obtains by the following method: keeping temperature controlling stove initiating terminal Po Er to paste under the prerequisite that the design temperature of temperature controller is constant, regulate temperature controlling stove end end Po Er to paste the design temperature of temperature controller, make temperature controlling stove initiating terminal, end end Po Er subsides temperature controller design temperature have difference.
In described a kind of broad tuning, infrared difference frequency produces the control method of generating device of laser, the temperature gradient at the PPLN crystal two ends described in step 5 obtains by the following method: regulate temperature controlling stove initiating terminal, end end Po Er to paste temperature controller design temperature simultaneously, make temperature controlling stove initiating terminal, end end Po Er subsides temperature controller design temperature have difference.
The present invention adopts technique scheme, has following beneficial effect:
(1) increased substantially in the QPM wavelength of infrared ideler frequency light accept bandwidth;
(2) realized the on a large scale translation of ideler frequency light QPM with position.
Accompanying drawing explanation
Fig. 1 is the structure chart that produces generating device of laser based on infrared difference frequency in PPLN crystal.Number in the figure explanation: DL is the pumping source generator of 1060nm wave band fixed wave length, ECDL is the tunable signal source generator of 1550nm wave band, PC1, PC2 are first, second Polarization Controllers, WDM is 1060/1550nm wideband WDM device, and M1 is that collimation convergence yoke, M2 are that collimating lens, M3 are filter plates.
Fig. 2 is the ideler frequency light normalization output spectral line of the acquisition of flashlight under different crystal temperature conditions.
Fig. 3 is set as respectively 30 and 50 when crystal two ends temperature
owhen C, the difference frequency output spectral line in PPLN crystal.
Fig. 4 is that the initial end temperature of crystal is fixed as 30
oc, works as T
2be increased to 70
owhen C, the difference frequency output spectral line in PPLN crystal.
Fig. 5 is as crystal terminal temperature T
2be set as 90
owhen C, the difference frequency output spectral line in PPLN crystal.
Fig. 6 be
t 1 with
t 2 be set as respectively 90 and 150
owhen C, the difference frequency output spectral line in PPLN crystal.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme of invention is elaborated:
Produce generating device of laser as shown in Figure 1 based on infrared difference frequency in PPLN crystal, comprise the pumping source generator DL of 1060nm wave band fixed wave length, wave band is that first, second Polarization Controller PC1, PC2 occur in the tunable signal source of 1550nm, 1060/1550nm wideband WDM device WDM, collimation convergence yoke M1, PPLN crystal, collimating lens M2, filter plate M3.The output optical fibre of the pumping source generator DL of 1060nm wave band fixed wave length, wave band is that the output optical fibre of the tunable signal source generator ECDL of 1550nm is connected with 1060/1550nm wideband WDM device WDM through first, second Polarization Controller PC1, PC2 respectively, on 1060/1550nm wideband WDM device WDM output light path, be disposed with collimation convergence yoke M1, PPLN crystal, collimating lens M2, filter plate M3, after filter plate M3, connect photodetector (Detector).The semiconductor laser of the optional fixed wave length of pumping source generator of 1060nm wave band fixed wave length, the broad tuning signal source generator that wave band is 1550nm is chosen as an external cavity tunable laser diode.
In a kind of broad tuning, infrared difference frequency produces the control method of generating device of laser., carry out temperature ramp control to producing LASER Light Source generating means based on infrared difference frequency in PPLN crystal, realize the output of broad tuning mid-infrared laser spectral line, specifically comprise the steps:
Step 1, is placed in PPLN crystal in the metal temperature control stove that heat conductivility is good, and posting design temperature at temperature controlling stove initiating terminal, end end is that the Po Er of T1, T2 pastes (Peltier) temperature controller, and T1, T2 numerical value are not etc.
Step 2, start the pumping source generator of 1060nm wave band fixed wave length, the tunable signal source generator that wave band is 1550nm, the pump light that pumping source generator produces, the flashlight that signal source generator produces obtain mid-infrared laser output through wavelength division multiplexer, lens, PPLN crystal.
Step 3, design temperature T1, T2 by temperature controlling stove initiating terminal, end end Po Er subsides temperature controller determine the QPM bandwidth of ideler frequency light, and then being produced the tuning range of principle picked up signal light by difference frequency, temperature controlling stove initiating terminal, end end Po Er paste temperature controller design temperature T1, T2 and are the temperature of PPLN crystal initial end and end end.
Step 4, the output wavelength of tuning fundamental frequency signal light in definite flashlight tuning range, to obtain tunable mid-infrared laser (being the continuous tunable mid-infrared laser of 3-5 mu m waveband) output.
Step 5, keep the temperature gradient at PPLN crystal two ends, change the design temperature of temperature controlling stove initial end, end end Po Er subsides temperature controller, repeating step 3 to step 4 obtains tunable mid-infrared laser output corresponding to unlike signal magic eye scope, keeps PPLN crystal temperature effect two ends temperature gradient to realize by the following method:
A. keep temperature controlling stove end end Po Er to paste under the prerequisite that the design temperature of temperature controller is constant, regulating temperature controlling stove initiating terminal Po Er to paste the design temperature of temperature controller, making temperature controlling stove initiating terminal, end end Po Er pastes temperature controller design temperature difference;
B. keeping temperature controlling stove initiating terminal Po Er to paste under the prerequisite that the design temperature of temperature controller is constant, regulate temperature controlling stove end end Po Er to paste the design temperature of temperature controller, make temperature controlling stove initiating terminal, end end Po Er pastes temperature controller design temperature difference;
C. regulate temperature controlling stove initiating terminal, end end Po Er to paste temperature controller design temperature simultaneously, make temperature controlling stove initiating terminal, end end Po Er subsides temperature controller design temperature have difference.
Be fixed as the pumping source generator of 1.08 μ m for wavelength, position and the width of the QPM bandwidth of infrared ideler frequency light in calculating according to temperature T 1, the T2 of PPLN crystal initial end and end end, then obtain the flashlight tuning range that meets phase-matching condition according to difference frequency control principle.Through testing: when pump light wavelength set is 1.08 μ m, T1, T2 are set as respectively 30 and 50
owhen C, in infrared ideler frequency light wavelength region be 3.516-3.551 μ m, according to difference frequency control principle, the tuning range that meets the flashlight of phase matched is 1.552-1.559 μ m, be also signal light wavelength if in this is interval tuning can obtain tunable in infrared ideler frequency light export.
As shown in Figure 2, for spectral line is exported in the ideler frequency light normalization of the acquisition of flashlight under different crystal temperature conditions.Be 30 at crystal temperature effect
owhen C, in infrared ideler frequency light exist and only exist a QPM band to be positioned at 3.557 μ m places, its corresponding QPM signal light wavelength is 1.551 μ m.Under this temperature conditions, the QPM BW of ideler frequency light is about 8nm.Analog result demonstration, along with the rising of crystal temperature effect, this ideler frequency light QPM is with gradually to the translation of short wavelength's direction, but QPM BW almost remains unchanged.When crystal temperature effect is increased to 200
owhen C, ideler frequency light QPM band has moved to 3.28 μ m places, and its corresponding signal light wavelength is 1.61 μ m.
As shown in Figure 3, we further studied under gradual change temperature conditions in PPLN crystal difference frequency output characteristic.When crystal initial segment and then end end temperature are set as respectively 30 and 50
owhen C, ideler frequency light QPM band has occurred that significant two peak structure, its overlayable wavelength region may are 3.516-3.551 μ m.It is pointed out that under gradual change type Temperature Distribution, due to the corresponding crystal effective length of each temperature value reduce caused the relative conversion efficiency of ideler frequency light in QPM band significantly to reduce.As shown in the figure, be 20 in temperature difference
owhen C, its conversion efficiency is reduced to 1/5 of respective value under uniform temperature condition.
As shown in Figure 4, along with the increase of crystal two ends temperature difference, ideler frequency light QPM BW also increases thereupon significantly gradually, and meanwhile the difference frequency conversion efficiency in QPM band also constantly reduces.The initial end temperature of crystal is fixed as 30
oc, works as T
2be increased to 70
owhen C, calculate the normalization ideler frequency light output spectral line obtaining as Fig. 5.Because the crystal two ends temperature difference has been increased to 40
oc, ideler frequency light QPM band presents multi-peaks structure, and its coverage extension is to 3.467-3.547 μ m, and difference frequency conversion efficiency is about 0.095 relatively.
Can make the QPM BW of ideler frequency light significantly increase although increase the temperature gradient at crystal two ends, ideler frequency light QPM is with near the border of long wavelength's one side is positioned at wavelength 3.55 μ m all the time.Its reason be crystal initial end temperature we be fixed on 30
oc.If change the temperature of crystal initial end, also can there is significant translation in the ideler frequency light QPM band that this is widened.Fig. 6 has provided
t 1 with
t 2 be set as respectively 90 and 150
owhen C, the normalization ideler frequency light output spectral line calculating.As seen from the figure, the ideler frequency light QPM band that now this is widened has moved to 3.288-3.464 μ m region.This shows, is keeping under certain temperature gradient condition, by changing ideler frequency light QPM that the temperature of crystal initial end also can the realize broadband translation with position.
From the normalization ideler frequency light output spectra line chart shown in Fig. 2 to Fig. 6, utilize method control of the present invention to produce generating device of laser based on infrared difference frequency in PPLN crystal, there is following beneficial effect:
(1) increased substantially in the QPM wavelength of infrared ideler frequency light accept bandwidth;
(2) realized the on a large scale translation of ideler frequency light QPM with position.
A partial experiment data of the present invention are just verified in above-mentioned test, in the time that T1, T2 get other numerical value, can obtain equally above-mentioned conclusion.
Claims (4)
1. the control method of infrared difference frequency generation generating device of laser in a broad tuning, it is characterized in that: infrared difference frequency in the broad tuning based on PPLN crystal is produced to LASER Light Source generating means and carry out temperature ramp control, realize the output of broad tuning mid-infrared laser spectral line, specifically comprise the steps:
Step 1, is placed in PPLN crystal in temperature controlling stove, and posting design temperature at temperature controlling stove initiating terminal, end end is that the Po Er of T1, T2 pastes temperature controller, and T1, T2 numerical value are not etc.;
Step 2, start the pumping source generator of 1060nm wave band fixed wave length, the tunable signal source generator that wave band is 1550nm, the pump light that described pumping source generator produces, the flashlight that signal source generator produces obtain mid-infrared laser spectral line through wavelength division multiplexer, lens, PPLN crystal;
Step 3, the design temperature T1, the T2 that are pasted temperature controller by temperature controlling stove initiating terminal, end end Po Er determine the QPM bandwidth of ideler frequency light, and then are produced the tuning range of principle picked up signal light by difference frequency;
Step 4, the output wavelength of tuning fundamental frequency signal light in definite flashlight tuning range, obtains tunable mid-infrared laser output;
Step 5, keeps the temperature gradient at PPLN crystal two ends, changes the design temperature of temperature controlling stove initial end, end end Po Er subsides temperature controller, and repeating step 3 to step 4 obtains tunable mid-infrared laser output corresponding to unlike signal magic eye scope.
2. the control method of infrared difference frequency generation generating device of laser in a kind of broad tuning according to claim 1, it is characterized in that: the temperature gradient at the PPLN crystal two ends described in step 5 obtains by the following method: keeping temperature controlling stove end end Po Er to paste under the prerequisite that the design temperature of temperature controller is constant, regulate temperature controlling stove initiating terminal Po Er to paste the design temperature of temperature controller, make temperature controlling stove initiating terminal, end end Po Er subsides temperature controller design temperature have difference.
3. the control method of infrared difference frequency generation generating device of laser in a kind of broad tuning according to claim 1, it is characterized in that: the temperature gradient at the PPLN crystal two ends described in step 5 obtains by the following method: keeping temperature controlling stove initiating terminal Po Er to paste under the prerequisite that the design temperature of temperature controller is constant, regulate temperature controlling stove end end Po Er to paste the design temperature of temperature controller, make temperature controlling stove initiating terminal, end end Po Er subsides temperature controller design temperature have difference.
4. the control method of infrared difference frequency generation generating device of laser in a kind of broad tuning according to claim 1, it is characterized in that: the temperature gradient at the PPLN crystal two ends described in step 5 obtains by the following method: regulate temperature controlling stove initiating terminal, end end Po Er to paste temperature controller design temperature simultaneously, make temperature controlling stove initiating terminal, end end Po Er subsides temperature controller design temperature have difference.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108493753A (en) * | 2018-03-12 | 2018-09-04 | 中国人民解放军国防科技大学 | Large-range wavelength tunable infrared laser based on super-continuum spectrum difference frequency |
| CN109167244A (en) * | 2018-08-14 | 2019-01-08 | 杭州镭克普光电技术有限公司 | A kind of system using chirp domain inversion structures nonlinear crystal improving laser difference frequency medium-wave infrared laser output power |
| WO2020095754A1 (en) * | 2018-11-06 | 2020-05-14 | 日本電信電話株式会社 | Wavelength conversion device |
| CN112751260A (en) * | 2021-01-05 | 2021-05-04 | 中国人民解放军国防科技大学 | Piezoelectric synchronous tuning ECDL laser based on fan-shaped ring structure |
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| CN108493753A (en) * | 2018-03-12 | 2018-09-04 | 中国人民解放军国防科技大学 | Large-range wavelength tunable infrared laser based on super-continuum spectrum difference frequency |
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| CN112751260A (en) * | 2021-01-05 | 2021-05-04 | 中国人民解放军国防科技大学 | Piezoelectric synchronous tuning ECDL laser based on fan-shaped ring structure |
| CN112751260B (en) * | 2021-01-05 | 2022-03-11 | 中国人民解放军国防科技大学 | Piezoelectric synchronous tuning ECDL laser based on fan-shaped ring structure |
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Application publication date: 20140528 |