Title :
Improvement of THz imaging
Author :
Jiang, Z. ; Zhang, X.-C.
Author_Institution :
Dept. of Phys., Appl. Phys., & Astron., Rensselaer Polytech. Inst., Troy, NY, USA
Abstract :
Summary form only given. In contrast to the scanning THz imaging system, the speed of which is limited by the mechanical scanning, the CCD-based THz imaging system promises real-time two-dimensional (2D) imaging capability. However, because the lock-in amplifier that suppresses the noise greatly can not be used with the CCD imager, the CCD-based THz imaging system suffers from low signal-to-noise ratio (SNR). We adopt the principle of the lock-in detection in a CCD THz imaging system, the SNR is greatly improved. As an example, the 2D distribution of the relatively weak THz pulses generated by an optical rectification emitter is measured.
Keywords :
CCD image sensors; infrared imaging; optical images; optical noise; optical pulse generation; real-time systems; rectification; 2D distribution; CCD imager; CCD-based THz imaging system; THz imaging; lock-in amplifier; lock-in detection; low signal-to-noise ratio; mechanical scanning; noise suppression; optical rectification emitter; pulse generation; real-time two-dimensional imaging capability; relatively weak THz pulse; scanning THz imaging system; Charge coupled devices; Low-noise amplifiers; Nonlinear optics; Optical amplifiers; Optical imaging; Optical pulse generation; Pulse measurements; Real time systems; Signal to noise ratio; Stimulated emission;
Conference_Titel :
Lasers and Electro-Optics, 2000. (CLEO 2000). Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-634-6
DOI :
10.1109/CLEO.2000.907258
