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公开(公告)号：US10031399B1
公开(公告)日：2018-07-24
申请号：US15868164
申请日：2018-01-11
Applicant: SHIBUYA CORPORATION
Inventor： Toshiaki Naka , Motoi Sasaki , Akito Tsuchiya
Abstract: A pumping beam L1 enters from a pumping beam projector 3 into one end surface 2a of a nonlinear crystal 2, the pumping beam L1 and idler wave L2 are generated from another end surface 2b of the nonlinear crystal 2. The pumping beam L1 emitted from the other end surface 2b of the nonlinear crystal 2 is reflected and re-enters as a pumping beam L′ into the other end surface 2b and the idler wave L2 generated from the other end surface 2b of the nonlinear crystal is reflected by the reflection optical system 6 and re-enters as a seed beam L2′ into the other end surface 2b. The idler wave L2 enters as the seed beam L2′ together with the pumping beam L1′ into the nonlinear crystal and thus a terahertz wave with a large output and including a plurality of wavelengths can be generated.
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公开(公告)号：US10241380B2
公开(公告)日：2019-03-26
申请号：US15801869
申请日：2017-11-02
Applicant: SHIBUYA CORPORATION
Inventor： Toshiaki Naka , Motoi Sasaki , Akito Tsuchiya
Abstract: A terahertz wave generator 1 includes a nonlinear crystal 4, which is capable of generating a terahertz wave TH, a pumping beam emitter 2, which emits a pumping beam L1, a seed beam emitter 3, which is disposed so as to be parallel to a nonlinear crystal 4 and emits a seed beam L2, a first total reflection mirror 17 and a second total reflection mirror 18, which successively reflect the seed beam L2 emitted from the seed beam emitter 3 to cause the seed beam L2 to be incident on the nonlinear crystal 4, and a convex lens 6, which collects the seed beam L2.
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公开(公告)号：US10120264B2
公开(公告)日：2018-11-06
申请号：US15815096
申请日：2017-11-16
Applicant: SHIBUYA CORPORATION
Inventor： Toshiaki Naka , Motoi Sasaki , Akito Tsuchiya
Abstract: A pumping beam L1 is caused to be incident on an end surface 4A of a nonlinear crystal 4, and a seed beam L2, the diameter of which is increased by a concave lens 6, is collected and adjusted into a collimated beam by a convex lens 7 and caused to be incident on the end surface 4A described above. The pumping beam L1 and the seed beam L2 are caused to be incident on the end surface 4A with the pumping beam L1 and the seed beam L2 superimposed on each other, whereby the nonlinear crystal 4 generates a terahertz wave TH.
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公开(公告)号：US09897893B2
公开(公告)日：2018-02-20
申请号：US15411086
申请日：2017-01-20
Applicant: SHIBUYA CORPORATION
Inventor： Kodo Kawase , Toshiaki Naka , Motoi Sasaki , Akito Tsuchiya
CPC classification number: G02F1/3501 , G02F1/3532 , G02F1/39 , G02F2001/3503 , G02F2001/3507 , G02F2001/392 , G02F2201/302 , G02F2203/13 , H01S3/0092 , H01S2302/02
Abstract: In a terahertz wave generation apparatus including a first non-linear optical crystal 3 on which first laser L1 and second laser L2 from laser generation means 2 are incident to generate terahertz wave TH1, the laser generation means includes a second non-linear optical crystal 7 on which laser having the same wavelength as that of the second laser is incident to generate idler light L1 including a plurality of wavelengths, and makes the idler light L1 generated from the second non-linear optical crystal incident on the first non-linear optical crystal as the first laser L1, to generate terahertz wave including a plurality of wavelengths from the first non-linear optical crystal 3, and wavelength selection means including a transmission section which transmits an idler light having the specific wavelength in the idler light including the plurality of wavelengths can be provided, as needed. Thus, terahertz wave having a high output power and including a plurality of wavelengths can be obtained, and the wavelength selection means easily obtains a required terahertz wave having the specific wavelength.
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