CN103001111A - Terahertz source generated based on nonlinear difference frequency of fiber lasers - Google Patents
Terahertz source generated based on nonlinear difference frequency of fiber lasers Download PDFInfo
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- CN103001111A CN103001111A CN2012104938820A CN201210493882A CN103001111A CN 103001111 A CN103001111 A CN 103001111A CN 2012104938820 A CN2012104938820 A CN 2012104938820A CN 201210493882 A CN201210493882 A CN 201210493882A CN 103001111 A CN103001111 A CN 103001111A
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- fiber laser
- laser
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3534—Three-wave interaction, e.g. sum-difference frequency generation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3551—Crystals
- G02F1/3553—Crystals having the formula MTiOYO4, where M=K, Rb, TI, NH4 or Cs and Y=P or As, e.g. KTP
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/13—Function characteristic involving THZ radiation
Abstract
The invention discloses a terahertz source generated based on nonlinear difference frequency of fiber lasers. The terahertz source comprises a fiber laser I (1), a fiber laser II (2), a laser beam combiner (3), a nonlinear optical crystal (4) and a parabolic spherical mirror (5) and is characterized in fiber laser beams of the fiber laser I (1) and the fiber laser II (2) are stacked together in space through the laser beam combiner (3), the combined laser beams are irradiated onto the nonlinear optical crystal (4), terahertz waves (6) generated by nonlinear difference frequency are collected by the parabolic spherical mirror (5) and then converted into parallel waves to be output. Full-solid terahertz sources can be obtained based on the fiber lasers, and the terahertz source is simple in structure, capable of being minimized easily, reliable in work, easy to operate, good in coherence and capable of operating stably at the room temperature.
Description
Technical field
The present invention relates to a kind of THz source, especially a kind of THz source that produces by the nonlinear optical parametric process based on fiber laser.
Background technology
As everyone knows, Terahertz Technology is in national defence, space exploration, medical treatment, the fields such as the scientific research potentiality that are widely used, recently the more than ten years, Terahertz Technology becomes a study hotspot, the research that wherein THz source is produced is again the most important thing, is the key that promotes Terahertz Technology development and extensive use.
Optical parameter concussion is based on a kind of technology of optical parameter effect, uses that this mechanism can produce reliable operation, convenient operation, the coherence is good and all solid state Terahertz of at room temperature steady running or mid-infrared laser source.The conventional solid-state lasers such as YAG usually are used as the pumping source of this type of optical parametric oscillator, yet these solid-state laser general structures are complicated, and volume is larger, and is expensive, and needs periodic maintenance.In recent years, fiber laser relies on its volume little, lightweight, hot spot is excellent, and heat radiation is easy, and cost is low, the outstanding speciality such as non-maintaining becomes study hotspot of field of lasers and is developed rapidly, myriawatt level average power can be provided at present and surpass the single pulse energy of 80mJ.
Summary of the invention
The purpose of this invention is to provide simple by nonlinear optics parametric process implementation structure, be easy to a kind of of miniaturization and do the THz source that nonlinear difference produces based on fiber laser.
The present invention is realized by the following technical programs.
A kind ofly do nonlinear difference and the THz source that produces based on fiber laser, comprise fiber laser I(1), fiber laser II(2), laser bundling device (3), nonlinear optical crystal (4), parabolic spherical mirror (5), it is characterized in that fiber laser I(1) and fiber laser II(2) the fine laser beam of two-beam spatially is added to one by laser bundling device (3), close laser beam incident behind the bundle to nonlinear optical crystal (4), collect and be converted into parallel wave output by the THz wave (6) that nonlinear difference produces through a parabolic spherical mirror (5).
If be two bundle of pulsed laser fiber laser I(1 among the present invention), fiber laser II(2), can realize two bundle of pulsed laser overlaping on time-domain by adding the time-delay light path, spatially be added to one by laser bundling device (3) again, close laser beam incident behind the bundle to nonlinear optical crystal (4), collect and be converted into parallel wave output by the THz wave (6) that nonlinear difference produces through a parabolic spherical mirror (5).
The present invention uses two bundle difference on the frequencies at the optical-fiber laser of Terahertz frequency domain, makes nonlinear difference and produce THz source in certain (such as phosphorus germanium zinc, gallium selenide etc.) nonlinear optical crystal, and its wavelength can come corresponding adjusting by the wavelength of regulating optical-fiber laser.
Optical-fiber laser of the present invention can be continuous type, it also can be impulse type, the optical frequency of the fiber laser that uses is poor at the Terahertz frequency domain, need only choose suitable nonlinear optical crystal according to wavelength and get final product, the basic standard of choosing crystal is that the little while crystal of THz ripple loss in nonlinear crystal of optical-fiber laser and generation possesses high as far as possible second order nonlinear coefficient and damage threshold.In selected nonlinear crystal, two the poor incident photon at the Terahertz frequency domain of optical frequency (fiber laser I, fiber laser II) produce new light field by the second nonlinear optical mixing process, three light fields need satisfy law of conservation of energy and phase-matching condition (conservation of momentum):
ω
1-ω
2=ω
3(1)
(2)
ω
1, ω
2, ω
3Respectively optical-fiber laser I, the photon frequency of optical-fiber laser II and THz wave;
,
,
Respectively optical-fiber laser I, the undulate quantity of optical-fiber laser II and THz wave.
The selected nonlinear optical crystal of the present invention has a variety of, can be bulk crystals, such as gallium selenide (GaSe), and phosphorus germanium zinc (ZGP) etc., in these bulk crystals, phase-matching condition is to utilize the birefringent characteristic of crystal to realize.It also can be the crystal that the periodic modulation structure is arranged, such as periodic polarized lithium niobate (PPLN), GaAs (QPM-GaAs) of potassium titanium oxide phosphate (KTP) and accurate phase matched (quasi-phase-matching) etc., in these crystal, the light wave that participates in non-linear frequency mixing is easy to realize accurate phase matched (quasi-phase-matching), also can use the larger non linear coefficient of crystal, also so strict to the direction of propagation and the polarization state requirement of light wave.
The present invention has simple in structure, be easy to miniaturization, reliable operation, convenient operation, the coherence is good, and can realize the advantages such as full solid T Hz radiation source of single-frequency, broadband, tunable, at room temperature steady running, in national defence, space exploration, medical treatment, the fields such as the scientific research potentiality that are widely used.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
A kind ofly do nonlinear difference and the THz source that produces based on fiber laser, comprise fiber laser I(1), fiber laser II(2), laser bundling device (3), nonlinear optical crystal (4), parabolic spherical mirror (5), it is characterized in that fiber laser I(1) and fiber laser II(2) the fine laser beam of two-beam spatially is added to one by laser bundling device (3), close laser beam incident behind the bundle to nonlinear optical crystal (4), collect and be converted into parallel wave output by the THz wave (6) that nonlinear difference produces through a parabolic spherical mirror (5).
If be two bundle of pulsed laser fiber laser I(1 among the present invention), fiber laser II(2), can realize two bundle of pulsed laser overlaping on time-domain by adding the time-delay light path, spatially be added to one by laser bundling device (3) again, close laser beam incident behind the bundle to nonlinear optical crystal (4), collect and be converted into parallel wave output by the THz wave (6) that nonlinear difference produces through a parabolic spherical mirror (5).
The present invention uses two bundle difference on the frequencies at the optical-fiber laser of Terahertz frequency domain, makes nonlinear difference and produce THz source in certain (such as phosphorus germanium zinc, gallium selenide etc.) nonlinear optical crystal, and its wavelength can come corresponding adjusting by the wavelength of regulating optical-fiber laser.
Optical-fiber laser of the present invention can be continuous type, it also can be impulse type, the optical frequency of the fiber laser that uses is poor at the Terahertz frequency domain, need only choose suitable nonlinear optical crystal according to wavelength and get final product, the basic standard of choosing crystal is that the little while crystal of THz ripple loss in nonlinear crystal of optical-fiber laser and generation possesses high as far as possible second order nonlinear coefficient and damage threshold.In selected nonlinear crystal, two the poor incident photon at the Terahertz frequency domain of optical frequency (fiber laser I, fiber laser II) produce new light field by the second nonlinear optical mixing process, three light fields need satisfy law of conservation of energy and phase-matching condition (conservation of momentum):
ω
1-ω
2=ω
3(1)
ω
1, ω
2, ω
3Respectively optical-fiber laser I, the photon frequency of optical-fiber laser II and THz wave;
,
,
Respectively optical-fiber laser I, the undulate quantity of optical-fiber laser II and THz wave.
The selected nonlinear optical crystal of the present invention has a variety of, can be bulk crystals, such as gallium selenide (GaSe), and phosphorus germanium zinc (ZGP) etc., in these bulk crystals, phase-matching condition is to utilize the birefringent characteristic of crystal to realize.It also can be the crystal that the periodic modulation structure is arranged, such as periodic polarized lithium niobate (PPLN), GaAs (QPM-GaAs) of potassium titanium oxide phosphate (KTP) and accurate phase matched (quasi-phase-matching) etc., in these crystal, the light wave that participates in non-linear frequency mixing is easy to realize accurate phase matched (quasi-phase-matching), also can use the larger non linear coefficient of crystal, also so strict to the direction of propagation and the polarization state requirement of light wave.
The present invention has simple in structure, be easy to miniaturization, reliable operation, convenient operation, the coherence is good, and can realize the advantages such as full solid T Hz radiation source of single-frequency, broadband, tunable, at room temperature steady running, in national defence, space exploration, medical treatment, the fields such as the scientific research potentiality that are widely used.
Claims (4)
1. THz source of doing nonlinear difference based on fiber laser and producing, comprise fiber laser I(1), fiber laser II(2), laser bundling device (3), nonlinear optical crystal (4), parabolic spherical mirror (5), it is characterized in that fiber laser I(1) and fiber laser II(2) the fine laser beam of two-beam spatially is added to one by laser bundling device (3), close laser beam incident behind the bundle to nonlinear optical crystal (4), collect and be converted into parallel wave output by the THz wave (6) that nonlinear difference produces through a parabolic spherical mirror (5).
2. claimed in claim 1ly a kind ofly do nonlinear difference and the THz source that produces based on fiber laser, it is characterized in that fiber laser I(1), fiber laser II(2) be two bundle of pulsed laser, realize two bundle of pulsed laser overlaping on time-domain by adding the time-delay light path, spatially be added to one by laser bundling device (3) again, close laser beam incident behind the bundle to nonlinear optical crystal (4), collect and be converted into parallel wave output by the THz wave (6) that nonlinear difference produces through a parabolic spherical mirror (5).
3. claimed in claim 1ly a kind ofly do nonlinear difference and the THz source that produces based on fiber laser, it is characterized in that fiber laser I(1), fiber laser II(2) two bundle difference on the frequencies are at the laser of Terahertz frequency domain, make nonlinear difference and produce THz source in nonlinear optical crystal, its wavelength is regulated by the wavelength of regulating optical-fiber laser.
4. claimed in claim 1ly a kind ofly do nonlinear difference and the THz source that produces based on fiber laser, it is characterized in that fiber laser I(1), fiber laser II(2) produce new light field by second nonlinear difference frequency process, three light fields need satisfy law of conservation of energy and phase-matching condition:
ω
1-ω
2=ω
3(1)
ω
1, ω
2, ω
3Respectively optical-fiber laser I, the photon frequency of optical-fiber laser II and THz wave;
,
,
Respectively optical-fiber laser I, the undulate quantity of optical-fiber laser II and THz wave.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633545A (en) * | 2013-12-07 | 2014-03-12 | 山东海富光子科技股份有限公司 | Difference-frequency tunable single-frequency terahertz source with external cavity strengthened |
| CN104505458A (en) * | 2014-11-27 | 2015-04-08 | 南京大学 | Portable continuous adjustable terahertz generator |
| CN106374323A (en) * | 2016-11-25 | 2017-02-01 | 中国科学院上海技术物理研究所 | Laser up-conversion terahertz difference frequency source detecting system |
| WO2018040625A1 (en) * | 2016-09-05 | 2018-03-08 | 华讯方舟科技有限公司 | Device and method for generating terahertz wave having orbital angular momentum |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7539221B1 (en) * | 2006-10-19 | 2009-05-26 | Np Photonics, Inc | Fiber-laser-based gigahertz sources through difference frequency generation (DFG) by nonlinear optical (NLO) materials |
| US7551652B1 (en) * | 2006-10-27 | 2009-06-23 | Np Photonics, Inc | Simultaneously Q-switched fiber lasers using a shared modulator |
| CN102929071A (en) * | 2012-11-19 | 2013-02-13 | 山东海富光子科技股份有限公司 | Single-frequency terahertz source generated by using single-frequency laser as nonlinear difference frequency |
-
2012
- 2012-11-28 CN CN2012104938820A patent/CN103001111A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7539221B1 (en) * | 2006-10-19 | 2009-05-26 | Np Photonics, Inc | Fiber-laser-based gigahertz sources through difference frequency generation (DFG) by nonlinear optical (NLO) materials |
| US7551652B1 (en) * | 2006-10-27 | 2009-06-23 | Np Photonics, Inc | Simultaneously Q-switched fiber lasers using a shared modulator |
| CN102929071A (en) * | 2012-11-19 | 2013-02-13 | 山东海富光子科技股份有限公司 | Single-frequency terahertz source generated by using single-frequency laser as nonlinear difference frequency |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633545A (en) * | 2013-12-07 | 2014-03-12 | 山东海富光子科技股份有限公司 | Difference-frequency tunable single-frequency terahertz source with external cavity strengthened |
| CN104505458A (en) * | 2014-11-27 | 2015-04-08 | 南京大学 | Portable continuous adjustable terahertz generator |
| CN104505458B (en) * | 2014-11-27 | 2017-10-20 | 南京大学 | A kind of portable continuously adjustabe Terahertz generator |
| WO2018040625A1 (en) * | 2016-09-05 | 2018-03-08 | 华讯方舟科技有限公司 | Device and method for generating terahertz wave having orbital angular momentum |
| US10541507B2 (en) | 2016-09-05 | 2020-01-21 | China Communication Technology Co., Ltd. | Generation device and generation method of terahertz waves with orbital angular momentum |
| CN106374323A (en) * | 2016-11-25 | 2017-02-01 | 中国科学院上海技术物理研究所 | Laser up-conversion terahertz difference frequency source detecting system |
| CN106374323B (en) * | 2016-11-25 | 2023-05-05 | 中国科学院上海技术物理研究所 | Laser up-conversion terahertz difference frequency source detection system |
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Application publication date: 20130327 |