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학술지 Simple and Cost-Effective Thickness Measurement Terahertz System Based on a Compact 1.55 μm λ/4 Phase-shifted Dual-mode Laser
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저자
류한철, 김남제, 한상필, 고현성, 박정우, 문기원, 박경현
발행일
201211
출처
Optics Express, v.20 no.23, pp.25990-25999
ISSN
1094-4087
출판사
Optical Society of America(OSA),
DOI
https://dx.doi.org/10.1364/OE.20.025990
협약과제
12SF1400, 포토닉스 집적회로 기반 테라헤르츠 무선 인터커넥션 기술 개발, 박경현
초록
A simple thickness measurement method based on the coherent homodyne CW THz system was demonstrated; it does not require precise control of the frequencies of the beat source, and only accurate scanning of the optical delay line is needed. Three beat frequencies are sufficient for measuring the thickness of a sample without considering the modulo 2? ambiguity. A novel compact 1.55 μm {\\lambda}/4 phase-shifted dual-mode laser (DML) was developed as an optical beat source for the CW THz system. The thickness of a sample was accurately estimated from the measurements using the proposed method. Our results clearly show the possibility of a compact, simple, and cost-effective CW THz system for practical applications. © 2012 Optical Society of America.
KSP 제안 키워드
Dual-mode laser, Effective thickness, Optical beat source, Phase-shifted, Precise control, THz system, cost-effective, measurement method, optical delay line, practical application, thickness measurement