Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Reexamination Certificate
2007-05-22
2007-05-22
Turner, Samuel A. (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
Reexamination Certificate
active
10926351
ABSTRACT:
A method for measuring a spectrum of a terahertz pulse includes generating a terahertz pulse using an ultrashort pulsed pumping light, generating a white light pulse using an ultrashort pulsed probe light, stretching and chirping the white light pulse modulating the chirped white light pulse such that the terahertz pulse and the chirped white light pulse irradiate into an electro-optic crystal synchronously, so that the chirped white light pulse is modulated by an electric field signal induced at the electro-optic crystal irradiated by the terahertz pulse, detecting a spectrum of chirped white light pulse modulated at the electro-optic modulating step by a multi-channeled detector, analyzing an electric field of the teraherz pulse irradiated to the electro-optic crystal from the spectrum of the chirped white light pulse detected by the multi-channeled spectrum detecting step, and transforming the analyzed electric field signal into a frequency spectrum of the terahertz pulse.
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patent: 2002/0067480 (2002-06-01), Takahashi
patent: 2003/0001558 (2003-01-01), Zhang et al.
patent: 2004/0196660 (2004-10-01), Usami
patent: 2001-222035 (2001-08-01), None
Kiyomi Sakai and Masanori Hangyo, “Terahertz Time Domain Spectroscopy and Imagin”, Laser Kenkyu, vol. 30, No. 7, Jul. 2002, p. 376-384.
Zhiping Jiang and X.-C. Zhang, “Electro-optic Measurement of THz Field Pulse with a Chirped Optical Beam”, Applied Physics Letters, vol. 72, No. 16, Apr. 20, 1998, pp. 1945-1947.
Nagai Masaya
Ohtake Hideyuki
Tanaka Koichiro
Yamashita Junpei
Yamashita Kumiko
Aisin Seiki Kabushiki Kaisha
Geisel Kara
Turner Samuel A.
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