Title:
TERAHERTZ WAVE PHASE DIFFERENCE MEASUREMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/118717
Kind Code:
A1
Abstract:
In order to provide a high-sensitivity terahertz wave phase difference measurement system having a high S/N ratio, tetrahertz interference waves are observed using a half mirror and a movable reference mirror, and the phase difference is calculated, by a terahertz wave generation/detection device that obtains a high S/N ratio by employing a terahertz wave generator for irradiating a non-linear optical crystal with angular phase-matched pump light and seed light, and a terahertz wave detector for irradiating a non-linear optical crystal with angular phase-matched pump light and terahertz waves. In order to match the optical path length of the pump light and the terahertz waves irrespective of the position of the movable reference mirror and the position of a measured object, a first optical delay device, and a second optical delay device that operates in conjunction with movement of a movable reference mirror of a Michelson interferometer, are introduced on the optical path of the pump light.
Inventors:
SHIRAMIZU NOBUHIRO (JP)
Application Number:
PCT/JP2014/075080
Publication Date:
August 13, 2015
Filing Date:
September 22, 2014
Export Citation:
Assignee:
HITACHI HIGH TECH CORP (JP)
International Classes:
G01N21/3581; G01J9/02; G01B9/02
Foreign References:
| JP2008116439A | 2008-05-22 | |||
| JP2009300279A | 2009-12-24 | |||
| JP2011075583A | 2011-04-14 | |||
| US20080074674A1 | 2008-03-27 |
Other References:
HAYASHI,S. ET AL.: "High-peak- power and tunable terahertz-wave generation and sensitive detection by using nonlinear parametric conversion", 37TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ, September 2012 (2012-09-01), pages 1 - 3, XP055218933
TAKIDA,Y. ET AL.: "Coherent electro-optical detection of THz-wave generated from synchronously pumped picosecond THz parametric oscillator", PROCEEDINGS OF SPIE, vol. 8240, 15 February 2012 (2012-02-15), pages 1 - 6, XP060023449
JUN'ICHI SHIKATA ET AL.: "Fourier transform THz-wave spectrometer using THz-wave parametric generation", IEICE TECHNICAL REPORT, vol. 100, no. 349, 6 October 2000 (2000-10-06), pages 31 - 36, XP008183893
TAKAYUKI ISOGAWA ET AL.: "Tomographic Imaging Using Photonically Generated Low-coherence Terahertz Sources", PROCEEDINGS OF THE 2012 IEICE GENERAL CONFERENCE, VOLUME ELECTRONICS(1, 6 March 2012 (2012-03-06), XP011459446
TAKIDA,Y. ET AL.: "Coherent electro-optical detection of THz-wave generated from synchronously pumped picosecond THz parametric oscillator", PROCEEDINGS OF SPIE, vol. 8240, 15 February 2012 (2012-02-15), pages 1 - 6, XP060023449
JUN'ICHI SHIKATA ET AL.: "Fourier transform THz-wave spectrometer using THz-wave parametric generation", IEICE TECHNICAL REPORT, vol. 100, no. 349, 6 October 2000 (2000-10-06), pages 31 - 36, XP008183893
TAKAYUKI ISOGAWA ET AL.: "Tomographic Imaging Using Photonically Generated Low-coherence Terahertz Sources", PROCEEDINGS OF THE 2012 IEICE GENERAL CONFERENCE, VOLUME ELECTRONICS(1, 6 March 2012 (2012-03-06), XP011459446
Attorney, Agent or Firm:
POLAIRE I. P. C. (JP)
Polaire Intellectual Property Corporation (JP)
Polaire Intellectual Property Corporation (JP)
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