Results 311 to 320 of about 84,369 (338)

Continuous-wave Terahertz Spectroscopy System Based on Photodiodes

PIERS Online, 2010
Photodiodes have been commonly used for generation of continuous terahertz (THz) waves. In this paper, we proposed the use of photodiodes also for detection of THz waves in order to realize CW THz spectroscopy system based on 1.55-"m flber-optics. We experimentally demonstrated two detection schemes based on the square-law detection and downconversion,
Tadao Nagatsuma, Akira Kaino, Shintaro Hisatake, Katsuhiro Ajito, Ho-Jin Song, Atsushi Wakatsuki, Yoshifumi Muramoto, Naoya Kukutsu, Yuichi Kado   +8 more
openaire   +1 more source

Rapidly swept continuous-wave cavity-ringdown spectroscopy

Chemical Physics Letters, 2011
Abstract Continuous-wave (cw) cavity-ringdown (CRD) spectroscopy provides a highly sensitive way to measure optical absorption by observing the decay rate of light from a high-finesse optical cavity containing the sample of interest (usually gas-phase molecules). In rapidly swept cw-CRD spectroscopy, optical build-up and subsequent ringdown decay are
Brian J. Orr, Yabai He
openaire   +1 more source

Cavity ring-down spectroscopy with a continuous wave laser

Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464), 2003
Most CRDS experiments used pulsed lasers as a light source because the pulsed laser is a convenient source of high-intensity photon bursts, even though the energy coupling efficiency is small. CRDS with a CW laser was successfully demonstrated by Romanini et al. (1997). They used an acousto-optic modulator to interrupt the CW laser beam introduced into
null Yong Shim Yoo, null Jae Won Hahn, null Jae Yong Lee, null Jae Wan Kim, null Hai-Woong Lee   +4 more
openaire   +1 more source

Continuous-wave laser optical spectroscopy of the oxygen atom

Journal of the Optical Society of America B, 1988
Doppler-limited and sub-Doppler laser spectroscopy of atomic oxygen is performed by means of optogalvanic detection. Collisional processes determining atomic populations are studied by simultaneous investigation of the fluorescence spectra. Fine structures are resolved, and the higher-accuracy values are compared with those previously inferred from ...
A. Sasso, P. Minutolo, M. I. Schisano, TINO, GUGLIELMO MARIA, INGUSCIO, MASSIMO   +4 more
openaire   +3 more sources

Optimization Investigations of Continuous Wave Cavity Ringdown Spectroscopy

Applied Physics Express, 2013
Optimization investigations of continuous wave cavity ringdown spectroscopy have been analyzed by demonstrating the dynamic response of the ringdown cavity. The intensity variations of cavity reflection and transmission as functions of modulation frequency and intracavity absorption loss are researched theoretically and experimentally.
Zhixin Li, Weiguang Ma, Xiaofang Fu, Wei Tan, Gang Zhao, Lei Dong, Lei Zhang, Wangbao Yin, Suotang Jia   +8 more
openaire   +1 more source

Continuous-wave laser fluorescence spectroscopy of impurities in tokamaks

Journal of Applied Physics, 1982
Laser-induced fluorescence spectroscopy has been applied as an in-situ diagnostic for impurity atoms in the edge region of the plasma in the Argonne Plasma Engineering Experiment (APEX) tokamak. Zirconium atoms introduced from a moveable probe were excited by a cw single-mode ring dye laser and monitored on lines of the a3F-z3F0 manifold.
C. E. Young, M. J. Pellin, D. M. Gruen, J. H. Norem   +3 more
openaire   +1 more source

Long-term stability in continuous wave cavity ringdown spectroscopy experiments

Applied Optics, 2010
Allan variance has been used to characterize the slow drift of a near-IR distributed feedback laser-based continuous wave cavity ringdown spectroscopy (CW-CRDS) system. Long-term drift in the cavity loss rate, highly correlated with changes in ambient pressure but not temperature, is observed.
Haifeng, Huang, Kevin K, Lehmann
openaire   +2 more sources

Forced Brillouin Spectroscopy Using Frequency-Tunable Continuous Wave Lasers

Physical Review Letters, 1995
We have developed a new method of phonon spectroscopy using forced Brillouin scattering: A scanning interference pattern produced by intersecting two cw lasers generates the density variation (acoustic phonons) through the thermal expansion for a light-absorbing liquid.
, Sonehara, , Tanaka
openaire   +2 more sources

Doppler-free spectroscopy using a continuous-wave optical frequency synthesizer

Applied Optics, 2006
A continuous-wave (cw) optical frequency synthesizer is demonstrated by using a monolithic-type cw optical parametric oscillator (cw-OPO) and an optical frequency comb. The cw-OPO is phase locked to an optical frequency comb that is phase locked to an atomic clock. The output frequency of the cw-OPO is frequency shifted with an electro-optic modulator,
Hajime, Inaba, Takeshi, Ikegami, Feng-Lei, Hong, Youichi, Bitou, Atsushi, Onae, Thomas R, Schibli, Kaoru, Minoshima, Hirokazu, Matsumoto   +7 more
openaire   +2 more sources

1.1-GHz Continuous-Wave EPR Spectroscopy with a Frequency Modulation Method

Journal of Magnetic Resonance, 2002
Continuous-wave EPR spectroscopy using a frequency modulation (FM) scheme was developed. An electronically tunable resonator and an automatic tuning control (ATC) system were used. Using the FM scheme instead of magnetic field modulation, we detected EPR absorption at the first derivative mode.
Hiroshi, Hirata, Mitsuru, Ueda, Mitsuhiro, Ono, Yuhei, Shimoyama   +3 more
openaire   +2 more sources