# US 10,120,264 B2 · Terahertz wave generator

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- Number: US 10,120,264 B2
- Document ID: US10120264B2
- Status: Granted
- Kind: B2
- Application number: 15/815,096
- Filed: 2017-11-16
- Published: 2018-05-31
- Granted: 2018-11-06
- Earliest claimed: 2016-11-30
- Assignees: Shibuya Corporation
- Applicants: Shibuya Corporation
- Inventors: Toshiaki Naka; Motoi Sasaki; Akito Tsuchiya
- Web page: https://patentgrep.com/patent/US10120264B2

## CPC

- G02F 1/39: for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F 1/3501: {Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals}
- G02F 1/3534: {Three-wave interaction, e.g. sum-difference frequency generation (G02F1/3532 takes precedence)}
- G02F 1/3503: {Structural association of optical elements, e.g. lenses, with the non-linear optical device}
- G02F 1/3551: {Crystals}
- G02F 2203/13: involving THZ radiation
- 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

## 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.

## Claims

### Claim 1

A terahertz wave generator comprising a nonlinear crystal capable of generating a terahertz wave based on a parametric effect, a pumping beam emitter that emits a pumping beam, a seed beam emitter that emits a seed beam, a convex lens disposed on an optical path of the seed beam and collecting the seed beam, a first collimator for adjusting a pumping beam emitted from the pumping beam emitter into a first collimated beam, a second collimator for adjusting a seed beam emitted from the seed beam emitter into a second collimated beam, a concave lens disposed between the seed beam emitter and the convex lens on the optical path of the seed beam, and a light guiding means for allowing the second collimated beam to pass the concave lens and thereafter, in parallel with an optical axis of the convex lens, to be incident on the convex lens, and moves the seed beam, with the concave lens, in a direction orthogonal to an optical axis of the convex lens, wherein the terahertz wave generator is configured so that the pumping beam and the seed beam are caused to be incident through an end surface of the nonlinear crystal to generate the terahertz wave and the second collimated beam, a diameter of which is increased by the concave lens and further collected by the convex lens, is caused to be incident on the nonlinear crystal so as to be superimposed on the first collimated beam on the end surface.