Thz Beam Pattern Observation Using Nec’s Real-time Terahertz Imager (eod13-1169a Pdf

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THz Beam Pattern Observation Using NEC’s Real-Time Terahertz Imager Photoconductive Antenna Difference Frequency Mixing Quantum Cascade Laser Parametric THz Free Electron Laser Cherenkov-Type THz source Gas Laser Air Plasma Frequency Multiplier Document No. Date Published: May 2013 Copyright© 2013 NEC Corporation 1 EOD13-1169A Quantum Cascade Laser In collaboration with Long Wave Photonics LLC Frequency THz Repetition kHz Pulse width Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - 4.3 200 500 ns (Easy QCL: Terahertz Quantum Cascade Laser System) 2 EOD13-1169A Photoconductive Antenna In collaboration with Zomega Terahertz Corporation (mini-Z: THz-TDS system) N. Oda et al., Proc. of SPIE Vol. 8716, 871603 (2013). Condition Lock-in mode ON Lock-in Freq. 3.75 Hz Frame Integration 16 Spatial Filter 3X3 In collaboration with National Institute for Fusion Science and Chubu University. Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - 3 EOD13-1169A Cherenkov-Type THz source Courtesy of Corporation ADVANTEST (TAS7500SU: : THz-TDS system) Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - N. Oda et al., Proc. of SPIE Vol. 8716, 871603 (2013). 4 EOD13-1169A Parametric Source In collaboration with RIKEN Sendai Frequency Repetition 1.8 THz 100 Hz (is-TPG: injection seeded THz-wave parametric generator ) Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - N. Oda et al., Proc. of SPIE Vol. 8716, 871603 (2013). 5 EOD13-1169A Difference Frequency Mixing Courtesy of Chiba university. Frequency Repetition 4 THz 1 MHz Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - 6 EOD13-1169 A Air Plasma In collaboration with University of Rochester and Zomega Terahertz Corporation Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - 7 EOD13-1169A Frequency Multiplier In collaboration with Virginia Diodes, Inc. Frequency GHz (CW) 525 Condition Lock-in mode ON Lock-in Freq. 3.75 Hz Frame Integration 16 Spatial Filter 16X16 N. Oda et al., Proc. of SPIE Vol. 8716, 871603 (2013). 8 EOD13-1169A CO2-Laser Pumped CD3OH Gas Laser In collaboration with Chubu University and National Institute for Fusion Science. Frequency THz (CW) 1.2 Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - 9 EOD13-1169A THz Free Electron Laser In collaboration with Institute of Scientific and Industrial Research, Osaka University. Frequency Repetition 3 THz 10 Hz Condition Lock-in mode OFF (30-Hz frame rate) Frame Integration Spatial Filter - N. Oda et al., Proc. of SPIE Vol. 8716, 871603 (2013). 10 EOD13-1169A Image reconstruction When beam repetition is slow and the source does not synchronize with a imager, the beam pattern fluctuates every frame. We developed an algorithm that reconstructs the image after the data acquisition. (a) Raw images (b) Image after reconstruction processing is applied. In collaboration with Institute of Scientific and Industrial Research, Osaka University. N. Oda et al., The 60th JSAP Spring Meeting 2013, 29a-D1-1 11 EOD13-1169A Would you like more information on how our imager can work? Please Contact Us ! Radio Application, Guidance and ElectroOptics Division NEC Corporation E-mail: [email protected] http://www.nec.com/en/global/prod/terahertz/ 12 EOD13-1169A This product utilizes the result of the research funded by National Institute of Information and Communications Technology (NICT) , Japan. 13 EOD13-1169A