Compact acousto-optic modulator operatingin the purely Raman — Nath diffraction regime as a phase modulator in FM spectroscopy

We report fabrication of a new acousto-optic modulator (AOM-RN) operating purely in the Raman - Nath diffraction regime. This device can be used as an external phase modulator in frequency-modulation (FM) optical heterodyne spectroscopy for fast and broadband frequency control of diode lasers. The A...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2010-08, Vol.40 (5), p.431-436
Main Authors: Baryshev, Vyacheslav N, Epikhin, V M
Format: Article
Language:English
Subjects:
ABSORPTION
ALKALI METALS
CESIUM
COHERENT SCATTERING
CONTROL
DESIGN
DIFFRACTION
DISPERSIONS
ELEMENTS
FABRICATION
FLUIDS
FREQUENCY CONTROL
FREQUENCY MODULATION
GASES
IMPEDANCE
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LASERS
METALS
MODULATION
RAMAN SPECTRA
RESONANCE
SCATTERING
SORPTION
SPECTRA
SPECTROSCOPY
TRAPPING
VAPORS
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Summary:We report fabrication of a new acousto-optic modulator (AOM-RN) operating purely in the Raman - Nath diffraction regime. This device can be used as an external phase modulator in frequency-modulation (FM) optical heterodyne spectroscopy for fast and broadband frequency control of diode lasers. The AOM-RN design is significantly simplified, and its dimensions are minimised due to a decrease (by almost an order of magnitude in comparison with the existing AOMs) in the acousto-optic interaction length and the absence of impedance matching circuit. The FM spectroscopy based on AOM-RN makes it possible to analyse both absorption and dispersion properties of optical resonances under study; this possibility is shown by the example of saturated-absorption resonances in cesium vapour. The possibility of detecting coherent population trapping resonances using FM spectroscopy with AOM-RN as an external phase modulator is experimentally demonstrated.
ISSN:1063-7818
1468-4799
DOI:10.1070/QE2010v040n05ABEH014074