CN102354897A - External secondary cascading difference frequency terahertz light source generation device and implementation method - Google Patents
External secondary cascading difference frequency terahertz light source generation device and implementation method Download PDFInfo
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Abstract
The invention discloses an external secondary cascading difference frequency terahertz light source generation device and an implementation method. The implementation method comprises the following steps of: respectively carrying out difference frequency by utilizing 1064nm main pumping laser and two paths of nearly degenerate point dual-wavelength laser pumped by self-frequency-doubled 532nm laser and generated by a dual-wavelength resonant cavity to generate two paths of high-power intermediate infrared laser in a range from 8mum to 18mum; and carrying out difference frequency on the two paths of intermediate infrared laser to generate high-power terahertz wave. According to the invention, the conversion efficiency is improved by a secondary cascading difference frequency way, a reasonable and feasible optical structure is designed, and a computer is used for carrying out accurate control, therefore a terahertz light source which has the advantages of high power, good monochromaticity, wide tuning range, compact structure and capability of solid-state integration is realized.
Description
Technical field
The present invention relates to a kind of Terahertz light source generating technique, refer in particular to a kind of outside secondary cascade difference frequency terahertz light source generating means and implementation method.
Background technology
Terahertz (Terahertz/THz) wave band typically refers to the electromagnetic wave of frequency in 0.1THz-10THz (wavelength 3mm-30 μ m) scope, is between infrared and extraordinary electromagnetic wave wave band millimeter wave band, just so-called far infrared and submillimeter wave wave band.The breakthrough of Terahertz coherent detection technology development over nearly 20 years; And find that gradually THz wave in the huge applications potentiality of using such as space remote sensing, material, imaging, information and communication technology (ICT), secure communication, safety detection etc., makes that Terahertz is focus and the focus that all becomes research in basic research or in technical application research.On the THz wave generating technique, but nonlinear optics difference frequency technology has high power, wide tunable range, narrow linewidth working and room temperature, no optics threshold value, many remarkable advantages such as can be all solid state integrated, has received and has paid close attention to widely and study.The nonlinear optics difference frequency needs two-way laser; Common one road wavelength is fixed; Another road wavelength-tunable; Focus on then or parallel inciding on the nonlinear crystal; But satisfy difference frequency outgoing THz wave behind the phase-matching condition, through changing the wavelength that one tunnel Wavelength of Laser is a tunable institute outgoing THz wave.
Stage used nonlinear optical difference frequency technology in use have significant limitations: Patent No. 200910051791.X of "an automatic measurement of the sample terahertz spectral characteristics System", and its method for generating terahertz using only a nonlinear crystal birefringence effect or residual dispersion through with features to meet the phase matching requirements, but due to the crystal absorption, walk-off effect and the impact of high-quality crystal growth difficulties, which can be used crystal length is usually only a few mm length, in which the role of a few millimeters length, two difference frequency conversion efficiency of the laser is very small (usually less than 10
-7 ), far less than the MP relationship, limiting The practical application of techniques.
The present invention takes into full account and improves the importance that action length promotes non-linear conversion efficient; In conjunction with the idea of cascade repeatedly; At first utilize 1064nm main pump Pu laser and its to carry out difference frequency respectively from the nearly degeneracy point dual-wavelength laser of two-way that the dual wavelength resonator of frequency multiplication 532nm laser pump (ing) produces; Produce the mid-infrared laser in the high-power 8-18 mu m range of two-way; Then this two-way mid-infrared laser is carried out difference frequency and produce high-power THz wave; And feasible optical texture reasonable in design; Utilize computer precisely to control, thereby improve the purpose that action length realizes the high-power terahertz signal output of high conversion efficiency by secondary cascade difference frequency.
Summary of the invention
The objective of the invention is to; Propose a kind of outside secondary cascade difference frequency and produce the generating means of THz wave light source and the implementation method of THz wave light source; Solved traditional nonlinear optics difference frequency method conversion efficiency and crossed low and strong excessively problem the crystal mass dependence; Strengthen the tunability of light source simultaneously, and significantly reduced the walk-off effect of long action length.
The technical scheme of Terahertz light source generating means is following:
Outside secondary cascade difference frequency terahertz light source generating means is made up of main pump Pu lasing light emitter 1, frequency multiplication module 2, double-colored spectroscope 3, speculum 4, dual wavelength resonant cavity 5, polarization splitting prism 6, Amici prism 7, first order nonlinear difference module 8, second level nonlinear difference module 9, electric machine controller 10 and computer 11 as shown in Figure 1.
Described main pump Pu lasing light emitter 1 is for mixing rubidium Yttrium aluminium garnet (YAG) type pulsed laser source, and it produces the pumping laser light beam of 1064nm, polarization direction level.
The effect of described frequency multiplication module 2 be laser beam frequency multiplication with main pump Pu lasing light emitter 1 to 532nm, as the pumping source of dual wavelength resonant cavity 5,532nm laser beam polarization direction is vertical.
The effect of described double-colored spectroscope 3 is transmission 532nm laser beams, remaining 1064nm laser beam after the reflection frequency multiplication.
The effect of described speculum 4 is adjustment 532nm laser beam directions.
The effect of described dual wavelength resonant cavity 5 is to produce near the two-way laser beam of degeneracy point 1064nm; Wherein the short laser beam of one road wavelength is called flashlight; The polarization direction is vertical, and the long laser beam of another road wavelength is called ideler frequency light, the polarization direction level.Dual wavelength resonant cavity 5 is by the 532nm laser pumping.The two-way optical maser wavelength tunable range that produces between 800nm to 1350nm, step-length is less than 0.5nm.
The effect of described polarization splitting prism 6 is a reflected signal light, transmission ideler frequency light.
The effect of described Amici prism 7 is that the 1064nm laser beam with incident is divided into the constant power two-way.
The effect of described first order nonlinear difference module 8 be that flashlight and ideler frequency light that 1064nm laser beam and dual wavelength resonant cavity 5 produces are carried out difference frequency respectively, the high-power mid-infrared laser of generation two-way.Wherein the effect of first speculum 8.1, second speculum 8.2, the 3rd speculum 8.3, the 4th speculum 8.4, the 5th speculum 8.5, the 6th speculum 8.6 is adjustment laser beam directions; Wherein the effect of first half-wave plate 8.7, second half-wave plate 8.8, the 3rd half-wave plate 8.9, the 4th half-wave plate 8.10 is polarization directions of adjustment laser beam; Wherein the effect of first polarization splitting prism 8.11, second polarization splitting prism 8.12 is that two-way laser is adjusted to the conllinear direction; Use therein first nonlinear crystal 8.13 is GaSe, and its logical light is of a size of 15mm * 15mm (optical axis direction 15mm); Wherein the effect of first electric rotary table 8.14 is optical axis directions of adjustment first nonlinear crystal 8.13, and feasible angle with incoming laser beam satisfies phase-matching condition; Use therein second nonlinear crystal 8.15 is GaSe, and its logical light is of a size of 15mm * 15mm (optical axis direction 15mm); Wherein the effect of second electric rotary table 8.16 is optical axis directions of adjustment second nonlinear crystal 8.15, and feasible angle with incoming laser beam satisfies phase-matching condition.
The effect of described second level nonlinear difference module 9 is that the two-way mid-infrared laser light beam that first order nonlinear difference module 8 produces is carried out optical difference frequency in the 3rd nonlinear crystal 9.5, obtains the outgoing of THz wave; Wherein the effect of the 7th speculum 9.1, the 8th speculum 9.2, the 9th speculum 9.3 is adjustment two-way laser beam directions; The effect of the 3rd polarization splitting prism 9.4 is that two-way laser is adjusted to the conllinear direction; Use therein the 3rd nonlinear crystal 9.5 is GaSe, and its logical light is of a size of 10mm * 2mm (optical axis direction 2mm); Wherein the effect of the 3rd electric rotary table 9.6 is optical axis directions of adjustment the 3rd nonlinear crystal 9.5, and feasible angle with incoming laser beam satisfies phase-matching condition; The effect of long-length filter 9.7 is that remaining two-way mid-infrared laser filtered light beam is fallen, and with the thz laser transmission; The effect of polyethylene lens 9.8 is that thz laser is carried out focussed collimated.
The effect of described electric machine controller 10 is that the electric rotary table on dual wavelength resonant cavity 5, first order nonlinear difference module 8, the second level nonlinear difference module 9 is controlled.
The effect of described computer 11 is to provide the system parameters instruction, controls the running parameter of whole Terahertz light source through electric machine controller 10.
Electric rotary table in computer 11, electric machine controller 10 and the device is with the electric connection mode transfer control signal.
Thereby the two-way laser beam that first order nonlinear difference module 8 can produce the 1064nm laser and the dual wavelength resonant cavity 5 of main pump Pu lasing light emitter 1 outgoing carries out difference frequency respectively and produces the high-power mid-infrared laser of two-way in first nonlinear crystal 8.13 and second nonlinear crystal 8.15, produce high-power thz laser thereby the two-way mid-infrared laser that second level nonlinear difference module 9 produces first order nonlinear difference module 8 carries out difference frequency in the 3rd nonlinear crystal 9.5; Device changes the THz wave light source frequency of outgoing through the output wavelength of adjustment dual wavelength resonant cavity 5.
The implementation method of device THz wave light source is following:
By the main pump laser source a 1064nm wavelength emitted by the laser pulse frequency module 2 after the exit of the laser 532nm, 532nm 1064nm lasers and remaining after the laser beam through three separate color spectroscope; 532nm laser light path through the reflector 4 after adjustment be pumped dual-wavelength resonator 5, produces nearly degenerate near the two lasers, ie shorter wavelength signal light wavelength longer idler, signal and idler beams through a polarization splitting prism six separate; while the remaining seven 1064nm laser by a prism into two equal power 1064nm laser, 1064nm laser all the way through the first half-wave plate followed by 8.7, 8.1, after the first mirror, and the dual-wavelength resonator 5 sequentially emitted by third reflector 8.3, 8.8 second half-wave plate, the second reflector 8.2 adjusted signal light of the first polarization splitting prism adjusted to a total of 8.11 line direction, and then through the first nonlinear crystal 8.13 (first electric rotating table 8.14 According to the computer instruction will first go to the optical axis of the nonlinear crystal 8.13 incident laser beam direction with a specific angle) for optical difference frequency generation all the way to mid-infrared laser, followed by another road 1064nm Laser fourth mirror 8.4, third half After the wave plate 8.9, with the dual-wavelength resonator 5 sequentially emitted by the fifth reflector 8.5, the fourth half-wave plate 8.10, sixth mirror 8.6 after adjusting idler in the second polarizing beam splitter adjusted to 8.12 collinear direction, and then through the second nonlinear crystal 8.15 (8.16 under the second electric rotary table computer instructions a second nonlinear crystal 8.15 Go with the optical axis direction of the incident laser beam to a specific angle) along the optical difference frequency generation mid-infrared laser; 8.13 from the first optically nonlinear crystals emitted difference frequency mid-infrared laser reflector 9.1 followed by the seventh, eighth, after reflector 9.2, and 8.15 in the second nonlinear crystal optical difference frequency emitted The reflector 9.3 through ninth after adjusting mid-infrared laser in the third polarizing beam splitter 9.4 adjusted collinear direction, and then through a third nonlinear crystal 9.5 (third electric rotary table 9.6 will be based on a third computer instructions nonlinear Go to Crystal 9.5 optical axis direction of the incident laser beam to a specific angle) for optical difference frequency generation of terahertz laser emitted terahertz laser followed by long-wave filters 9.7 and polyethylene filtering collimating lens 9.8.Computer 11 provides the system parameters instruction, and the shoot laser wavelength that changes dual wavelength resonant cavity 5 comes tuning Terahertz wavelength, and changes the location parameter of each nonlinear crystal through electric machine controller 10 each electric rotary tables of control.
Advantage of the present invention is:
1, the Terahertz source power is high, and monochromaticjty is good, and nonlinear optics difference frequency conversion efficiency is high;
2, reduction greatly reduces crystal through the middle infrared transparent wave band of the difference frequency wavelength being adjusted to crystal and absorbs the influence for difference frequency the dependence of crystal mass;
3, come continuous tuning Terahertz wavelength through changing two difference frequency wavelength, strengthened the tunability of light source, remedied the CO2 laser in the deficiency of infrared difference frequency medium wavelength tuning performance difference;
4, significantly reduced walk-off effect in the nonlinear optics difference frequency process.
5, the terahertz light source structure is compact, can be all solid state integrated, and the Automatic Control that uses a computer.
Description of drawings
Fig. 1 is a Terahertz light source principle schematic.
Label among the figure: 1 is main pump Pu lasing light emitter; 2 is the frequency multiplication module; 3 is double-colored spectroscope; 4 is speculum; 5 is the dual wavelength resonant cavity; 6 is polarization splitting prism; 7 is Amici prism; 8 is that (8.1 is first speculum to first order nonlinear difference module; 8.2 be second speculum; 8.3 be the 3rd speculum; 8.4 be the 4th speculum; 8.5 be the 5th speculum; 8.6 be the 6th speculum; 8.7 be first half-wave plate; 8.8 be second half-wave plate; 8.9 be the 3rd half-wave plate; 8.10 be the 4th half-wave plate; 8.11 be first polarization splitting prism; 8.12 be second polarization splitting prism; 8.13 be first nonlinear crystal; 8.14 be first electric rotary table; 8.15 be second nonlinear crystal; 8.16 be second electric rotary table); 9 is that (9.1 is the 7th speculum to second level nonlinear difference module; 9.2 be the 8th speculum; 9.3 be the 9th speculum; 9.4 be the 3rd polarization splitting prism; 9.5 be the 3rd nonlinear crystal; 9.6 be the 3rd electric rotary table; 9.7 be long-length filter; 9.8 be the polyethylene lens); 10 is electric machine controller; 11 is computer.Thick line is a light path among Fig. 1, and fine rule is a circuit.
Embodiment
In conjunction with Fig. 1, be that example is done further to describe to invention to produce 300 μ m thz lasers:
By the laser of pulse laser outgoing 532nm after frequency multiplication module 2 of the 1064nm wavelength of main pump Pu lasing light emitter 1 outgoing, light beam is separately behind double-colored spectroscope 3 for 532nm laser and remaining 1064nm laser; 532nm laser carries out pumped dual-wavelength resonant cavity 5 after the adjustment of speculum 4 light paths; Produce near the two-way laser of nearly degeneracy point; One road signal light wavelength is 999nm, and one tunnel ideler frequency optical wavelength is 1160nm, and flashlight and ideler frequency light are through polarization splitting prism 6 light beams separately; And remaining 1064nm laser is divided into the two-way 1064nm laser of constant power behind Amici prism 7; One road 1064nm laser is successively through first half-wave plate 8.7; Behind first speculum 8.1; With successively through the 3rd speculum 8.3; Second half-wave plate 8.8; Second speculum, 8.2 adjusted 999nm laser are adjusted to the conllinear direction through first polarization splitting prism 8.11; Then through first nonlinear crystal 8.13 (first electric rotary table 8.14 according to computer instruction with first nonlinear crystal, 8.13 optical axis directions go to 999nm laser beam direction be certain degree) carry out optical difference frequency and produce 16.1 μ m laser; Another road 1064nm laser is successively through the 4th speculum 8.4; Behind the 3rd half-wave plate 8.9; With successively through the 5th speculum 8.5; The 4th half-wave plate 8.10; The adjusted 1160nm laser of the 6th speculum 8.6 are adjusted to the conllinear direction through second polarization splitting prisms 8.12, then through second nonlinear crystal 8.15 (second electric rotary table 8.16 according to computer instruction with second nonlinear crystal, 8.15 optical axis directions go to 1160nm laser beam direction be certain degree) carry out optical difference frequency and produce 17 μ m laser; 16.1 μ m laser is successively behind the 7th speculum 9.1, the 8th speculum 9.2; Be adjusted to the conllinear direction with warp the 9th speculum 9.3 adjusted 17 μ m laser at the 3rd polarization splitting prism 9.4 places; Then through the 3rd nonlinear crystal 9.5 (the 3rd electric rotary table 9.6 according to computer instruction with the 3rd nonlinear crystal 9.5 optical axis directions go to 16.1 μ m laser beam directions be certain degree) carry out the thz laser that optical difference frequency produces 300 μ m, the thz laser of outgoing carries out the filtering collimation through long-length filter 9.7 and polyethylene lens 9.8 successively.Computer 11 provides the system parameters instruction, changes the shoot laser wavelength of dual wavelength resonant cavity 5, and changes the location parameter of each nonlinear crystal through electric machine controller 10 each electric rotary tables of control.
The present invention further describes as follows:
Main devices
A) main pump Pu laser: the Pulse Nd that German InnoLas company produces: YAG laser, model are SpitLight200/10, wavelength 1064nm;
B) dual wavelength resonant cavity: the Surelite OPO Plus laser that U.S. Continuum company produces, use the 532nm laser pumping;
C) Amici prism: Thorlabs company model is the broadband beam splitter prism of BS011, and available band is 700-1200nm;
D) polarization splitting prism: the PBS type product that dayoptics company in Fujian produces;
E) electric rotary table: the product of Japanese Harmonic Drive Systems company.
Claims (5)
1. outside secondary cascade difference frequency terahertz light source generating means; Comprise main pump Pu lasing light emitter (1); Frequency multiplication module (2); Double-colored spectroscope (3); Speculum (4); Dual wavelength resonant cavity (5); Polarization splitting prism (6); Amici prism (7); First order nonlinear difference module (8); Second level nonlinear difference module (9); Electric machine controller (10) and computer (11); It is characterized in that: the two-way laser beam that first order nonlinear difference module (8) can produce the 1064nm laser of main pump Pu lasing light emitter (1) outgoing and dual wavelength resonant cavity (5) respectively first nonlinear crystal (8.13) with second nonlinear crystal (8.15) thus in carry out difference frequency and produce the high-power mid-infrared laser of two-way, second level nonlinear difference module (9) can with the two-way mid-infrared laser of first order nonlinear difference module (8) generation at the 3rd nonlinear crystal (9.5) thus in carry out difference frequency and produce high-power thz laser; Described device changes the THz wave light source frequency of outgoing through the output wavelength of adjustment dual wavelength resonant cavity (5).
2. a kind of outside secondary cascade difference frequency terahertz light source according to claim 1, it is characterized in that: described main pump Pu lasing light emitter (1) is to mix rubidium Yttrium aluminium garnet (YAG) type pulsed laser source;
3. a kind of outside secondary cascade difference frequency terahertz light source according to claim 1, it is characterized in that: described first nonlinear crystal (8.13) and second nonlinear crystal (8.15) are the GaSe crystal.
4. a kind of outside secondary cascade difference frequency terahertz light source according to claim 1, it is characterized in that: described the 3rd nonlinear crystal (9.5) is the GaSe crystal.
5. Terahertz light source implementation method based on the said device of claim 1 is characterized in that may further comprise the steps:
1) laser of pulse laser outgoing 532nm after frequency multiplication module (2) of the 1064nm wavelength of main pump Pu lasing light emitter (1) outgoing, 532nm laser and remaining 1064nm laser light beam behind double-colored spectroscope (3) separates;
2) 532nm laser carries out pumped dual-wavelength resonant cavity (5) after the adjustment of speculum (4) light path; Produce near the two-way laser of nearly degeneracy point; Be short flashlight of wavelength and the long ideler frequency light of wavelength, flashlight and ideler frequency light are through polarization splitting prism 6 light beams separately;
3) remaining 1064nm laser is divided into the two-way 1064nm laser of constant power by Amici prism (7); Wherein one road 1064nm laser is successively behind first half-wave plate (8.7), first speculum (8.1); With by dual wavelength resonant cavity (5) outgoing locate to be adjusted to the conllinear direction through the 3rd speculum (8.3), second half-wave plate (8.8), the adjusted flashlight of second speculum (8.2) at first polarization splitting prism (8.11) successively, carry out optical difference frequency through first nonlinear crystal (8.13) then and produce one road mid-infrared laser; Another road 1064nm laser is successively behind the 4th speculum (8.4), the 3rd half-wave plate (8.9); With by dual wavelength resonant cavity (5) outgoing locate to be adjusted to the conllinear direction through the 5th speculum (8.5), the 4th half-wave plate (8.10), the adjusted ideler frequency light of the 6th speculum (8.6) at second polarization splitting prism (8.12) successively, carry out optical difference frequency through second nonlinear crystal (8.15) then and produce one road mid-infrared laser;
4) from first nonlinear crystal (8.13) mid-infrared laser of optical difference frequency outgoing successively behind the 7th speculum (9.1), the 8th speculum (9.2); Be adjusted to the conllinear direction with the adjusted mid-infrared laser of warp the 9th speculum (9.3) of optical difference frequency outgoing from second nonlinear crystal (8.15) at the 3rd polarization splitting prism (9.4); Carry out optical difference frequency through the 3rd nonlinear crystal (9.5) then and produce thz laser, the thz laser of outgoing carries out the filtering collimation through long-length filter (9.7) and polyethylene lens (9.8) successively;
5) computer (11) provides the system parameters instruction, and the shoot laser wavelength that changes dual wavelength resonant cavity (5) comes tuning Terahertz wavelength.
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| CN107017543A (en) * | 2017-06-15 | 2017-08-04 | 江西师范大学 | The device and method of tunable THz wave is produced in microcavity |
| CN107425399A (en) * | 2017-06-12 | 2017-12-01 | 江西师范大学 | The method that infrared laser produces THz wave in nonlinear crystal cascade difference frequency chamber phase matched |
| CN114720947A (en) * | 2022-06-07 | 2022-07-08 | 浙江大学 | Terahertz radar detection method and system based on photon frequency doubling technology |
| CN117977381A (en) * | 2024-03-29 | 2024-05-03 | 中国科学技术大学 | Mid-infrared laser source |
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