The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 06, 2009
Filed:
Oct. 29, 2004
Jun-ichi Nishizawa, Sendai-shi, Miyagi, JP;
Ken Suto, Sendai, JP;
Tetsuo Sasaki, Sendai, JP;
Tadao Tanabe, Sendai, JP;
Tomoyuki Kimura, Sendai, JP;
Jun-ichi Nishizawa, Sendai-shi, Miyagi, JP;
Ken Suto, Sendai, JP;
Tetsuo Sasaki, Sendai, JP;
Tadao Tanabe, Sendai, JP;
Tomoyuki Kimura, Sendai, JP;
Other;
Tohoku University, Sendai-shi, JP;
Abstract
An electromagnetic wave generator encompasses a first pump beam emitter () configured to emit a first pump beam (hv) having a wavelength larger than one micrometer; a second pump beam emitter () configured to emit a wavelength-tunable second pump beam (hv) having a wavelength larger than one micrometer, the wavelength of which is different from the wavelength of the first pump beam (hv); a nonlinear optical crystal () configured to generate an electromagnetic wave (hv) of a difference frequency between the first pump beam (hv) and second pump beam (hv); and an optical system (M, M) configured to irradiate the first pump beam (hv) and second pump beam (hv) to the nonlinear optical crystal (), by adjusting an external intersection angle between the first pump beam (hv) and second pump beam (hv) within 0.5° at the difference frequency of 1 THz. Here, a frequency-tunable terahertz electromagnetic wave (hv) is generated in the nonlinear optical crystal (), by changing the frequency of the second pump beam (hv), being liked with the change of the external intersection angle.