CN104597605A - Beam shaping method for reducing QCL (quantum cascade laser) terahertz source diffraction effect and divergence angle - Google Patents
Beam shaping method for reducing QCL (quantum cascade laser) terahertz source diffraction effect and divergence angle Download PDFInfo
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- CN104597605A CN104597605A CN201510039709.7A CN201510039709A CN104597605A CN 104597605 A CN104597605 A CN 104597605A CN 201510039709 A CN201510039709 A CN 201510039709A CN 104597605 A CN104597605 A CN 104597605A
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- beam shaping
- terahertz
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- terahertz lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to a beam shaping method for reducing QCL terahertz source diffraction effect and divergence angle. A beam shaping module used in the method is composed of a plurality of terahertz lenses or a mixture of terahertz lens and off-axis parabolic mirrors. Nearly Gaussian distribution beams of small divergence angle are obtained by adjusting the light path of the beam shaping module. The beam shaping method for reducing QCL terahertz source diffraction effect and divergence angle has the advantages of being capable of synchronically reducing the beam divergence angle to obtain nearly Gaussian beam distribution beams of small divergence angle as well as effectively reducing the QCL terahertz source intense diffraction effect due to output end aperture constraint, thereby greatly prompting a QCL terahertz source application research process.
Description
Technical field
The present invention relates to the beam shaping method of a kind of reducing amount qc laser (quantum cascade laser, referred to as QCL) THz source diffraction effect and the angle of divergence.
Background technology
Terahertz (THz) ripple refers to frequency (corresponding wavelength is from 3 millimeters to 30 microns) from 0.1THz to 10THz, electromagnetic wave between millimeter wave and infrared light, has the features such as security, broadband property, " dactylogram characteristic " and penetrability.THz ripple has important scientific value and wide application prospect, has unique advantage in multiple fields such as basic science, investigation of materials, biomedicine, national public safeties.
THz source generally includes free electron laser, works in the gas laser of Terahertz frequency range, vacuum electronics THz source, ultrafast laser pump light conductance THz source, QCL THz source and photonics THz source and other semiconductor electronic cosmogonys etc.Because QCL THz source not only has higher power level, and there is the advantages such as energy conversion efficiency is high, volume is little, light and easy of integration, therefore thought by academia a terahertz emission source most possibly realizing through engineering approaches and industrialization.
At present, the maximum power output of QCL THz source reaches 250mW, and maximum operating temperature is 186K, and lowest operating frequency is 1.2THz, if externally-applied magnetic field, minimum sharp radio frequency rate can arrive 0.68THz.Along with improving constantly of device performance, QCL THz source is more and more obvious at the potential application advantage in the fields such as imaging, communication and heterodyne detection.
The quality of beam quality be affect device can one of the key factor obtaining practical application.QCL THz source is greater than device size, the especially thickness of device usually due to its resonance wavelength, and the beam cross section EDS maps that it is exported presents strong diffraction effect, disperses full-shape and is usually greater than 60 degree.
Summary of the invention
The strong diffraction effect brought is limited in order to overcome QCL THz source due to output terminal aperture, the present invention adds light beam shaping module in the transmission light path that QCL THz source is follow-up, not only effectively can reduce QCL THz source due to output terminal aperture limits the strong diffraction effect brought, and can beam divergence angle be reduced, obtain the nearly Gaussian distribution light beam of small divergence angle, this brings great impetus by the applied research of QCL THz source.
The technical solution adopted for the present invention to solve the technical problems is: a kind of light-beam forming unit reducing QCL THz source diffraction effect and the angle of divergence, described device adopts light beam shaping module, described module is made up of multi-disc Terahertz lens, or to be mixed with off-axis paraboloidal mirror by Terahertz lens and form.By regulating light beam shaping module light path, obtain the nearly Gaussian distribution light beam of small divergence angle.
The invention has the beneficial effects as follows, while effectively reduction QCL THz source limits due to output terminal aperture the strong diffraction effect brought, synchronously can reduce beam divergence angle, obtain the nearly Gaussian distribution light beam of small divergence angle, this will advance the applied research process of QCL THz source greatly.
Accompanying drawing explanation
Describe exemplary embodiment of the present invention in more detail by referring to accompanying drawing, above and other aspect of the present invention and advantage will become and more be readily clear of, in the accompanying drawings:
Fig. 1 is structural representation of the present invention.
A1.QCL THz source in figure, a2. Terahertz lens, a3. Terahertz lens, a4. Terahertz planar array detector, b1. off-axis paraboloidal mirror, b2. off-axis paraboloidal mirror.
Embodiment
Hereinafter, more fully the present invention is described now with reference to accompanying drawing, various embodiment shown in the drawings.But the present invention can implement in many different forms, and should not be interpreted as being confined to embodiment set forth herein.On the contrary, provide these embodiments to make the disclosure will be thoroughly with completely, and scope of the present invention is conveyed to those skilled in the art fully.
Hereinafter, with reference to the accompanying drawings exemplary embodiment of the present invention is described in more detail.
With reference to accompanying drawing 1, in Fig. 1 (a), the output light of QCL THz source a1, after the Terahertz lens combination shaping that a2 and a3 forms, adopts Terahertz planar array detector a4 can monitor the nearly Gaussian distribution hot spot of small divergence angle; In Fig. 1 (b), the off-axis paraboloidal mirror group parallelization that the output light of QCL THz source a1 is made up of b1 and b2 after Terahertz lens a2 focuses on, Terahertz planar array detector a4 can monitor the nearly Gaussian distribution hot spot of small divergence angle; In Fig. 1 (c), the off-axis paraboloidal mirror group that the output light of QCL THz source a1 forms through b1 and b2 is collected and parallelization, again through the Terahertz lens combination shaping of a2 and a3 composition, Terahertz planar array detector a4 can monitor the nearly Gaussian distribution hot spot of small divergence angle; In Fig. 1 (d), the output light of QCL THz source a1 is after the Terahertz lens combination shaping that a2 and a3 forms, again through the off-axis paraboloidal mirror group parallelization of b1 and b2 composition, Terahertz planar array detector a4 can monitor the nearly Gaussian distribution hot spot of small divergence angle.
The foregoing is only embodiments of the invention, be not limited to the present invention.The present invention can have various suitable change and change.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. reduce a beam shaping method for QCL THz source diffraction effect and the angle of divergence, it is characterized in that:
Described method adopts light beam shaping module, and described module is made up of multi-disc Terahertz lens, or mix with off-axis paraboloidal mirror by Terahertz lens and form, by adjustment light beam shaping module light path, and the nearly Gaussian distribution light beam of acquisition small divergence angle.
2. reduce a light-beam forming unit for QCL THz source diffraction effect and the angle of divergence, it is characterized in that:
Described device adopts light beam shaping module, and described module is made up of multi-disc Terahertz lens, or to be mixed with off-axis paraboloidal mirror by Terahertz lens and form.
3. a kind of light-beam forming unit reducing QCL THz source diffraction effect and the angle of divergence as claimed in claim 2, is characterized in that:
Described light beam shaping module is the Terahertz lens combination that Terahertz lens (a2) form with Terahertz lens (a3).
4. a kind of light-beam forming unit reducing QCL THz source diffraction effect and the angle of divergence as claimed in claim 2, is characterized in that:
The off-axis paraboloidal mirror group that described light beam shaping module is Terahertz lens (a2) and is made up of off-axis paraboloidal mirror (b1) and off-axis paraboloidal mirror (b2) after it.
5. a kind of light-beam forming unit reducing QCL THz source diffraction effect and the angle of divergence as claimed in claim 2, is characterized in that:
Described light beam shaping module is the off-axis paraboloidal mirror group that off-axis paraboloidal mirror (b1) and off-axis paraboloidal mirror (b2) form and the Terahertz lens combination be made up of Terahertz lens (a2) and Terahertz lens (a3) after it.
6. a kind of light-beam forming unit reducing QCL THz source diffraction effect and the angle of divergence as claimed in claim 2, is characterized in that:
Described light beam shaping module is the Terahertz lens combination be made up of Terahertz lens (a2) and Terahertz lens (a3) and the off-axis paraboloidal mirror group be made up of off-axis paraboloidal mirror (b1) and off-axis paraboloidal mirror (b2) after it.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510039709.7A CN104597605A (en) | 2015-01-27 | 2015-01-27 | Beam shaping method for reducing QCL (quantum cascade laser) terahertz source diffraction effect and divergence angle |
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| CN201510039709.7A CN104597605A (en) | 2015-01-27 | 2015-01-27 | Beam shaping method for reducing QCL (quantum cascade laser) terahertz source diffraction effect and divergence angle |
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| CN104597605A true CN104597605A (en) | 2015-05-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109901086A (en) * | 2019-03-29 | 2019-06-18 | 电子科技大学 | A kind of matched quasi-optical cellular construction of realization wave beam |
Citations (5)
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|---|---|---|---|---|
| JP2004085359A (en) * | 2002-08-27 | 2004-03-18 | Tochigi Nikon Corp | Terahertz pulse light measuring device |
| CN101663575A (en) * | 2007-08-31 | 2010-03-03 | 佳能株式会社 | Imaging method and apparatus using terahertz radiation |
| US7683778B2 (en) * | 2006-02-15 | 2010-03-23 | Canon Kabushiki Kaisha | Apparatus for detecting information on object |
| CN102243167A (en) * | 2011-04-01 | 2011-11-16 | 深圳大学 | Terahertz wave imaging device |
| CN204462543U (en) * | 2015-01-27 | 2015-07-08 | 中国工程物理研究院激光聚变研究中心 | A kind of light-beam forming unit reducing QCL THz source diffraction effect and the angle of divergence |
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2015
- 2015-01-27 CN CN201510039709.7A patent/CN104597605A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004085359A (en) * | 2002-08-27 | 2004-03-18 | Tochigi Nikon Corp | Terahertz pulse light measuring device |
| US7683778B2 (en) * | 2006-02-15 | 2010-03-23 | Canon Kabushiki Kaisha | Apparatus for detecting information on object |
| CN101663575A (en) * | 2007-08-31 | 2010-03-03 | 佳能株式会社 | Imaging method and apparatus using terahertz radiation |
| CN102243167A (en) * | 2011-04-01 | 2011-11-16 | 深圳大学 | Terahertz wave imaging device |
| CN204462543U (en) * | 2015-01-27 | 2015-07-08 | 中国工程物理研究院激光聚变研究中心 | A kind of light-beam forming unit reducing QCL THz source diffraction effect and the angle of divergence |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109901086A (en) * | 2019-03-29 | 2019-06-18 | 电子科技大学 | A kind of matched quasi-optical cellular construction of realization wave beam |
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