Terahertz wave generator

Patent metadata

Field	Value
Publication number	US-10120264-B2
Application number	US-201715815096-A
Country	US
Kind code	B2
Filing date	Nov 16, 2017
Priority date	Nov 30, 2016
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A pumping beam L 1 is caused to be incident on an end surface 4 A of a nonlinear crystal 4 , and a seed beam L 2 , 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 4 A described above. The pumping beam L 1 and the seed beam L 2 are caused to be incident on the end surface 4 A with the pumping beam L 1 and the seed beam L 2 superimposed on each other, whereby the nonlinear crystal 4 generates a terahertz wave TH.

First claim

What is claimed is:

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.

Assignees

• Shibuya Corp

Inventors

• Naka Toshiaki
• Sasaki Motoi
• Tsuchiya Akito

Classifications

• G02F1/39 Primary

  for parametric generation or amplification of light, infrared or ultraviolet waves · CPC title

• G02F1/3501

  Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals · CPC title

• G02F2203/13

  involving THZ radiation · CPC title

• G02F1/3534

  Three-wave interaction, e.g. sum-difference frequency generation (G02F1/3532 takes precedence) · CPC title

• G02F1/3551

  Crystals · CPC title