Engineering topics

Chou, Nee-Yin

Publications and source records attributed to Chou, Nee-Yin.

3 records

NASA NTRS1991

Spectral features of a new crystal - Cr:KTP and its potential application for self-frequency doubling

The paper describes a technique for growing Cr-doped single crystals of KTiOPO4 (Cr:KTP) and presents the spectral characteristics, lasing potential, and SHG properties of Cr:KTP. It is shown that the use of Cr:KTP as a lasing medium is potentially promising due to the combination of the wide spectral bandwidth and reasonable gain. The potential application of the crystal for self frequency doubling is discussed.

Chou, Nee-Yin↗

NASA NTRS1989

Optical fringe reduction technique for FM laser spectroscopy

A simple fringe reduction method for FM diode laser spectroscopy is discussed. The fringes can be effectively suppressed by using a modulation frequency that is an integral multiple of the free spectral range of the fringes. The technique is experimentally confirmed by two-tone FM spectroscopy of water vapor absorption lines. A factor of 20 fringe reduction is observed.

Chou, Nee-Yin↗

NASA NTRS1987

Single-tone and two-tone AM-FM spectral calculations for tunable diode laser absorption spectroscopy

A generalized theory for optical heterodyne spectroscopy with phase modulated laser radiation is used which allows the calculation of signal line shapes for frequency modulation spectroscopy of Lorentzian gas absorption lines. In particular, synthetic spectral line shapes for both single-tone and two-tone modulation of lead-salt diode lasers are presented in which the contributions from both amplitude and frequency modulations are included.

Chou, Nee-Yin↗