A phase-modulated interferometer for high-precision spectroscopy
Year: 2000
Authors: Wicht A., Muller M., Quetschke V., Rinkleff R.H., Rocco A., Danzmann K.
Autors Affiliation: iv Hannover, Spekt Abt, Inst Atom & Mol Phys, D-30167 Hannover, Germany; Max Planck Inst Quantenopt, Aussenstelle Hannover, D-30167 Hannover, Germany.
Abstract: We present a novel spectroscopic method based on a phase-modulated interferometer which is suitable for the high-precision measurement of absorption and index of refraction profiles. A comparison with competing methods, that is with interferometry and mil spectroscopy, is given. The combination of these two methods, the phase-modulated interferometer, is shown to be best suited for experiments aiming at the realization of novel optical media, for example media exhibiting an ultra-large index of refraction or strong dispersion without absorption. The theory of operation and a theoretical and experimental signal-to-noise analysis are presented. Current detection limits for optical phase shift and relative absorption are 1.1 x 10(-5) rad/root Hz and 2×10(-5)/root Hz, respectively. We demonstrate the effectiveness of this novel technique by investigating the absorption and index of refraction profiles of the 4s(2) S-1(0) –> 4s4p P-1(1) resonance transition at 423 nm in calcium.
Journal/Review: APPLIED PHYSICS B-LASERS AND OPTICS
Volume: 70 (6) Pages from: 821 to: 831
KeyWords: Electromagnetically Induced Transparency; High-resolution Spectroscopy; Frequency-modulation; Diode-laser; Shot-noise; Quantum Coherence; Atomic-beam; Sensitivity; Interference; LightDOI: 10.1007/PL00021141Citations: 4data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-20References taken from IsiWeb of Knowledge: (subscribers only)