Scanning laser THz imaging system and its application

Author

Tonouchi, Masayoshi

Author_Institution

Inst. of Laser Eng., Osaka Univ., Suita, Japan

fYear

2013

fDate

9-14 June 2013

Firstpage

1

Lastpage

2

Abstract

We have proposed and developed a scanning laser terahertz (THz) imaging system using a 1.56μm femtosecond fiber laser for high-spatial resolution and high-speed measurement. The laser pulses are scanned over a 2D THz emitter plate such as DASC(4´-dimenthylamino-N-methyl-4-stilbazolium p-chlorobenzenesulfonate), GaAs, and ZnTe crystals by a galvano meter. In this system, THz wave pulses locally generated at the laser irradiation spots transmit through the sample set on the emitter, and the amplitude of the transmitted THz wave pulse is detected by using a typical THz time-domain spectroscopy (THz-TDS) technique. We established model for distributed optical source. Using this system, we have succeeded in obtaining THz transmission image of a human hair with a spatial resolution of sub-wavelength at an imaging speed of about 47 seconds/image for 512 × 512 pixels.

Keywords

II-VI semiconductors; III-V semiconductors; fibre lasers; gallium arsenide; high-speed optical techniques; image resolution; microwave photonics; optical images; organic compounds; terahertz wave imaging; zinc compounds; 2D THz emitter plate; DASC(4´-dimenthylamino-N-methyl-4-stilbazolium p-chlorobenzenesulfonate); GaAs; THz time-domain spectroscopy; THz wave pulses; THz-TDS; ZnTe; distributed optical source; femtosecond fiber laser; galvanometer; high-spatial resolution; high-speed measurement; human hair; laser pulses; scanning laser THz imaging system; Hair; High-speed optical techniques; Measurement by laser beam; Optical imaging; Optical pulses; Spatial resolution;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics (CLEO), 2013 Conference on

Conference_Location

San Jose, CA

Type

conf

Filename

6833730