Dual laser acousto‐optical diffraction technique for the calibration of a CO2 laser scattering apparatus

In this paper a dual laser acousto‐optical diffraction technique is described that provides an absolute calibration of a CO2 laser coherent scattering apparatus and other heterodyne receivers. Rather than directly detecting the sound pressure of the acoustic field or the power diffracted from the CO...

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Bibliographic Details
Published in:Review of scientific instruments 1990-09, Vol.61 (9), p.2314-2317
Main Authors: Chang, Li‐Yan, Zeng, Lei, Cao, Jin‐Xiang, Yu, Chang‐Xuan, Zu, Qing‐Xin
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Holography
Optics
Physics
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Summary:In this paper a dual laser acousto‐optical diffraction technique is described that provides an absolute calibration of a CO2 laser coherent scattering apparatus and other heterodyne receivers. Rather than directly detecting the sound pressure of the acoustic field or the power diffracted from the CO2 laser beam, the sound pressure is measured with the heterodyne detection of acousto‐optical diffraction from a He‐Ne laser beam. Noise equivalent power (NEP) measurement of the heterodyne receiver for the CO2 laser scattering apparatus and the studies of the detector bias and local oscillator power dependence of NEP values are performed by this technique. The measured minimum NEP value (6.8×10−20 W/Hz) is very close to the quantum noise limit.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1141356