CN100358192C - Generator of terahertz by oscillator with acyclic polarized crystal and double-wavelength optical parameter - Google Patents
Generator of terahertz by oscillator with acyclic polarized crystal and double-wavelength optical parameter Download PDFInfo
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- CN100358192C CN100358192C CNB2005100144846A CN200510014484A CN100358192C CN 100358192 C CN100358192 C CN 100358192C CN B2005100144846 A CNB2005100144846 A CN B2005100144846A CN 200510014484 A CN200510014484 A CN 200510014484A CN 100358192 C CN100358192 C CN 100358192C
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Abstract
The present invention relates to a terahertz generator using a double-wavelength optical parameter oscillator with acyclic polarized crystals, which belongs to the technology of generating terahertz wave sources. The terahertz generator comprises a pumping source, an optical coupling lens assembly, an input mirror, an output mirror, a nonlinear crystal C2 and a temperature control furnace thereof, and the present invention is characterized in that a lithium niobate acyclic polarized crystal C1 and a temperature control furnace thereof are arranged between the input mirror and the output mirror, and the working temperature of the temperature control furnace ranges from 100DEG C to 200DEG C. When the wavelength of pump light lambda<p> is equal to 1064 nm, the incidence of the acyclic polarized crystal C1 into the non-linear crystal C2 takes the way of two signal light beams of which the wavelengths lambda<1, 2> are respectively equal to 1500 nm and 1510 nm. The difference frequency of the non-linear crystal C2 produces a terahertz wave of which the frequency range is from 1.19 THz to 1.45THz under the conditions that the end face of the non-linear crystal C2 is plated with an anti-reflection film of which the thickness ranges from 1450 nm to 1550 nm, the polarized period is 35 mu m, the angle alpha is equal to 23DEG, and the working temperature of the temperature control furnace of the non-linear crystal C2 ranges from 100DEG C to 200DEG C. The present invention has the advantages of easy construction, no threshold of the produced terahertz, high conversion efficiency and convenient adjustment of light paths.
Description
Technical field
The present invention relates to a kind of device of generator of terahertz by oscillator with acyclic polarized crystal and double-wavelength optical parameter, belong to the technology that produces the Terahertz wave source.
Background technology
Terahertz (Terahertz, 1THz=10
12Hz) frequency range is meant frequency from 0.3THz to 10THz, the electromagnetic radiation zone between millimeter wave and infrared light.This is one and has very much scientific value but still undeveloped electromagnetic radiation zone.For a long time, because lacking effective Terahertz produces and detection method, people are very limited for the understanding of this wave band electromagnetic radiation character, so that this wave band is called as the Terahertz space in the electromagnetic spectrum, also are last frequency windows that pending comprehensive research is arranged in the electromagnetic spectrum.
Why Terahertz Technology causes people's extensive concern in recent years, is because it has great scientific value and wide application prospect at aspects such as object image-forming, environmental monitoring, medical diagnosis, radio astronomy, broadband mobile communication, satellite communication and military radars.
Because the above-mentioned major application prospect of terahertz electromagnetic wave, existing in the world at present a plurality of seminars have carried out the scientific research in Terahertz field.
By the end of 2002, in the U.S., Jefferson laboratory realized high-power Terahertz light source.Rensselaer Polytech Inst has realized in the Terahertz research center T-ray path tomography art, and the T-ray is used for biological sample identification and imaging.Begun the research of non-linear tera-hertz spectra analytics in other laboratories of the U.S., THz wave quantum optices and quantum calculation etc.Italy and Britain have realized all solid state thz laser device.At US and European, also realized the medical application of THz wave.In Germany, realized that the Terahertz resonant structure is used for unmarked DNA identification.Japanese then proposed under high-intensity magnetic field, to utilize semiconductor to produce the physical mechanism of Terahertz ray.
Though it is a lot of to obtain the method for THz wave, principle is also different, but utilizing nonlinear difference (DFG) process is wherein a kind of important means, its great advantage is not have threshold value, and testing equipment is easy to build, realize the difference frequency conversion easily, its key is to obtain close pump light of wavelength and flashlight, and following several method commonly used is arranged:
(1) dual wavelength output Ti:Al
2O
3Laser; (2) be operated near the optical parametric oscillator of degeneracy point; (3) utilize two nonlinear crystals to realize the optical parametric oscillator of dual signal light running; (4) utilize dual periodical poled crystal to realize the optical parametric oscillator of dual signal light running.
The said method conversion efficiency is low, and the optical system complexity is not easy to light path and regulates.
Summary of the invention
The object of the present invention is to provide a kind of device of generator of terahertz by oscillator with acyclic polarized crystal and double-wavelength optical parameter, this device is easy to set up, and the Terahertz of generation does not have threshold value.
The present invention is realized by technical scheme once.A kind of device with generator of terahertz by oscillator with acyclic polarized crystal and double-wavelength optical parameter, the frequency range of THz wave is 1.19THz～1.45THz, this device comprises pumping source 1, the first optical coupling lens group 2 and the second optical coupling lens group 7, input mirror 3, outgoing mirror 6, nonlinear crystal C
28 and temperature controlling stove 9, wherein pumping source comprises semiconductor laser 1-1, the 3rd optical coupling lens group 1-2, Nd:YAG crystal 1-3, acoustooptic Q-switching 1-4, aperture light 1-5 hurdle, output coupling mirror 1-6.It is characterized in that device comprises that also be provided with the crystal of lithium niobate between input mirror 3 and outgoing mirror 6, it is of a size of the acyclic polarized crystal C of 30mm * 5mm * 1mm, single electricdomain width L=10 μ m
14 and temperature controlling stove 5, acyclic polarized crystal C
1100 ℃～200 ℃ of temperature controlling stove 5 working temperatures, and at pump light λ
pDuring=wavelength 1064nm, this acyclic polarized crystal is with λ
1=1500nm and λ
2Two flashlight incident nonlinear crystal C of=1510nm
28, at nonlinear crystal C
2The anti-reflection film of end face plating 1450nm～1550nm, polarization cycle is 35 μ m, α=23 °, nonlinear crystal C
2The working temperature of temperature controlling stove 9 be 100 ℃～200 ℃, then by nonlinear crystal C
2It is 1.19THz～1.45THz THz wave that difference frequency produces frequency range.
The invention has the advantages that device is easy to set up, the Terahertz of generation does not have threshold value.And the conversion efficiency height, be convenient to light path and regulate.
Description of drawings
Fig. 1 is the structure chart of one section acyclic polarized crystal; Fig. 2 is an apparatus structure schematic diagram of the present invention; Fig. 3 is the structural representation of 1 pumping among Fig. 2; Fig. 4 is the nonlinear crystal structure of tilt cycle and the schematic diagram that produces THz wave.
Among the figure: 1 is pumping source, and 2 is the first optical coupling lens group, and 3 is input mirror, and 4 is acyclic polarized crystal C
1, 5 is temperature controlling stove, and 6 is outgoing mirror, and 7 is the second optical coupling lens group, and 8 is nonlinear crystal C
2, 9 is temperature controlling stove, and 1-1 is the LD pumping source, and 1-2 is the 3rd optical coupling lens group, and 1-3 is the Nd:YAG crystal, and 1-4 is an acoustooptic Q-switching, and 1-5 is a smallcolumn diaphragm, and 1-6 is an output coupling mirror.
Embodiment
Following mask body is introduced the parameter of each optics.Semiconductor laser 1-1 is centre wavelength 808nm in the time of 25 ℃, and breadth of spectrum line is 2.5nm, and the optical fiber core diameter is 400 μ m, and numerical aperture is 0.22, carries temperature control and cooling system.Optical coupling lens group 1-2 is coupled into the Nd:YAG crystal to the 808nm pump light of optical fiber output, requires focal beam spot diameter＜1mm, depth of focus＞10mm, loss＜10%.Laser cavity adopts Ping-Ping cavity configuration simple in structure, pumping Nd:YAG crystal 1-3 behind the 808nm light process coupled system 1-2 of semiconductor laser output, crystal front end face plating 808nm is high thoroughly, 1064nm is all-trans film, as input mirror, output plating 808nm, 1064nm anti-reflection film, the Nd:YAG crystalline size is 3mm * 3mm * 5mm, and doping content is 0.5atm%, and crystal by adopting thermostatted water circulator is controlled at 22.5 ℃ with temperature.In order to improve peak power, we add acoustooptic Q-switching 1-4, realize quasi-continuous 1064nm output.Repetition rate 1-19KHz is adjustable.In order to improve beam quality, add smallcolumn diaphragm 1-5 limit bundle, but made threshold value improve, power output decreases.Output coupling mirror 1-6 is 10% to the transmitance of 1064nm, and the chamber is about and is 95mm.
1064nm light focuses on acyclic polarized crystal C through behind the coupled system 2
1The center, spot radius is about 100 μ m.The OPO chamber is that the plano-concave output coupling mirror 6 of 100mm is formed by a plane input coupling mirror 3 and a radius of curvature.The chamber is about and is 90mm, and the light 95% of 3 pairs of 1064nm wavelength of input coupling mirror is high saturating, and high anti-to dual signal light＞99%, [6 pairs of dual signal light 12% see through output coupling mirror, to pump light 80% transmission.They all are high the absorptions to ideler frequency light (3-4 μ m), and OPO is to the flashlight single resonance like this.
Acyclic polarized crystal C
1Two ends are coated with the anti-reflection film to 1064nm and 1450nm～1550nm.Because LiNbO
3The light injury threshold of crystal is relevant with temperature, and temperature rising light injury threshold also obviously raises.So, selling off damage for avoiding crystal light, we are crystal C
1Be contained in 5 li of temperature controlling stoves, working range is a room temperature to 200 ℃, and being heated to 137 ℃ on average needs 12 minutes.The temperature controller operating voltage is 85～235VAC, and the ambient temperature of operate as normal can be from-10 ℃～55 ℃.Adopt pt100 as temperature sensor, temperature control precision is higher than ± and 0.1 ℃.Dual signal light by 6 outputs is focused on second nonlinear crystal C through behind the coupled system 7
28 center.General nonlinear crystal is more intense to the absorption of THz, thus nonlinear crystal we select the periodical poled crystal of tilt cycle, can obtain side direction radiation THz wave like this, and utilize bolometer detector to carry out THz and survey.Nonlinear crystal C
2The anti-reflection film of 8 crystal end-face plating 1450nm～1550nm, polarization cycle is 35 μ m, α=23 °.Nonlinear crystal C
2Be placed in the temperature controlling stove 9, by changing crystal C
2Temperature, realize the phase matched under the different incident wavelength conditions.Change the acyclic polarized crystal temperature in 100 ℃～200 ℃ scopes, can obtain optical parametric oscillator dual signal light wavelength tuning range is 1491.3nm (1500.2nm)～1519.4nm (1530.7nm).This dual signal light is incided the nonlinear crystal C of tilt cycle
2On, again by regulating C
2Temperature, the frequency range that difference frequency produces THz wave is 1.19THz～1.45THz.
Claims (1)
1. device with generator of terahertz by oscillator with acyclic polarized crystal and double-wavelength optical parameter, described Terahertz wave frequency is 1.19THz～1.45THz, this device comprises pumping source (1), the first optical coupling lens group (2) and the second optical coupling lens group (7), input mirror (3), outgoing mirror (6), nonlinear crystal C
2(8) and temperature controlling stove (9), wherein pumping source comprises semiconductor laser (1-1), the 3rd optical coupling lens group (1-2), Nd:YAG crystal (1-3), acoustooptic Q-switching (1-4), smallcolumn diaphragm (1-5), output coupling mirror (1-6) is characterized in that, device also comprises, be provided with the crystal of lithium niobate between input mirror (3) and outgoing mirror (6), it is of a size of the acyclic polarized crystal C of 30mm * 5mm * 1mm, single electricdomain width L=10 μ m
1(4) and temperature controlling stove (5), acyclic polarized crystal C
1100 ℃～200 ℃ of temperature controlling stove (5) working temperatures, and at pump light λ
pDuring=wavelength 1064nm, this acyclic polarized crystal is with λ
1=1500nm and λ
2Two flashlight incident nonlinear crystal C of=1510nm
2(8), at nonlinear crystal C
2The anti-reflection film of end face plating 1450nm～1550nm, polarization cycle is 35 μ m, α=23 °, nonlinear crystal C
2The working temperature of temperature controlling stove (9) be 100 ℃～200 ℃, then by nonlinear crystal C
2It is 1.19THz～1.45THz THz wave that difference frequency produces frequency range.
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| CN101910748A (en) * | 2007-11-02 | 2010-12-08 | 株式会社铃矢电机服务 | Overheated compressed hot air stream producing method and device, object processed by overheated compressed hot air stream, processing method, and processing apparatus |
| CN102064462B (en) * | 2009-11-11 | 2012-08-08 | 中国科学院半导体研究所 | Optical parametric oscillator with wide tuning range and dual-wavelength output |
| CN101820089B (en) * | 2010-02-08 | 2012-11-28 | 北京理工大学 | Tera-hertz-based polarization converter in synchronous wireless transceiver system |
| CN101924318B (en) * | 2010-08-18 | 2012-12-05 | 中国科学院半导体研究所 | Device for outputting dual wavelength laser and terahertz wave based on single periodical and polarized crystal |
| CN102176521B (en) * | 2010-12-08 | 2013-08-07 | 南京邮电大学 | Terahertz surface plasma wave temperature control switch and control method thereof |
| CN102082386B (en) * | 2010-12-24 | 2012-07-11 | 中国科学院西安光学精密机械研究所 | Single-pump double-output photon-generated terahertz radiation method and generation device thereof |
| CN102419485B (en) * | 2011-10-10 | 2013-08-28 | 天津大学 | Terahertz frequency comb device based on optical rectification in periodically poled crystal and modulation method |
| CN102436115B (en) * | 2011-12-23 | 2013-11-13 | 天津大学 | Method for improving terahertz wave generation efficiency and transmissivity |
| CN103368042A (en) * | 2013-07-05 | 2013-10-23 | 中国科学院半导体研究所 | Terahertz source equipment based on semiconductor ultra-short pulsed laser |
| CN108336632B (en) * | 2017-01-18 | 2020-03-06 | 中国科学院理化技术研究所 | Cavity mirror crystal integrated ultrastable cavity device and method |
| 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 |
| CN107482433B (en) * | 2017-09-12 | 2021-06-18 | 中国科学院电子学研究所 | Optical parametric oscillator |
| CN108683071B (en) * | 2018-07-05 | 2023-06-09 | 中国科学院福建物质结构研究所 | Periodically polarized crystal waveguide device with closed-loop waveguide structure and laser |
| CN112670799B (en) * | 2020-12-29 | 2023-03-24 | 华北水利水电大学 | Multi-frequency terahertz radiation source based on optimized difference frequency |
| CN113314940B (en) * | 2021-05-27 | 2022-06-03 | 长春理工大学 | Multi-wavelength mid-infrared laser pulse train cavity emptying laser based on Nd, MgO and APLN crystals |
| CN113314939B (en) * | 2021-05-27 | 2022-06-03 | 长春理工大学 | Multi-wavelength mid-infrared laser energy ratio regulation and control amplifier based on Nd-MgO-APLN crystal |
| CN113839291A (en) * | 2021-08-24 | 2021-12-24 | 北京遥感设备研究所 | Terahertz radiation source based on non-periodically polarized lithium niobate crystal and acquisition method |
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