Tech Area / Field. Brief Description of TechnologyHighly sensitive methods of polarization-optical monitoring of transparent objects have been developed

• PHY-OPL: Physics / Optics and Lasers
• INS-DET: Instrumentation / Detection Devices

Brief Description of Technology
Highly sensitive methods of polarization-optical monitoring of transparent objects have been developed. The main peculiarity of these methods is the original combination of strong polarization modulation of probing laser radiation with differential registration of information signals. With an optimal choice of measurement configurations, this allows us to eliminate the surface polarization effects and measure the small inner birefringence of transparent objects. The threshold sensitivity and resolving power of non-steady birefringence measurements are limited only by the shot (photon) noises and are in the range of 1–4 ´ 10^-4 angular minutes. The methods are tested by investigations of precision optical elements and materials of high optical quality. Theoretical investigations of the possible uses of the squeezed states of light for precision polarization-optical measurements have been developed.

Legal Aspects
The physical principles of the methods and their applications have been reported at topical conferences and presented in scientific publications.

Special Facilities in Use and Their Specifications
None in this research.

Scientific Papers
Fofanov Ya.A. Threshold Sensitivity in Optical Measurements with Phase Modulation. Report of the Tenth Union Symposium and Seminar on High-Resolution Molecular Spectroscopy. Siniza L.N., Ed. Proc. SPIE. 1991, vol. 1811, p. 413-414.

Sokolov I.M., and Fofanov Ja.A.. Investigations of the small birefringence of transparent objects by strong phase modulation of probing laser radiation. J. Opt. Soc. Am. A, 1995, vol. 12, no. 7, pp. 1579-1588.

Afanasyev I.I. and Fofanov Ja.A. Structural birefringence in the crystals of optical fluorite. Optics and Spectroscopy (Russia), 1997 (to be published).

Fofanov Ja.A. The suppression of power fluctuations in nature and shot noise in a laser with power stabilization. Radiotechnics and Electronics (USSR), 1988, vol. 33, no 1, pp. 177-179.

Sokolov I.V. and Fofanov Ja.A. Sensitivity of the Optical Polarization Measurements in Squeezed Light. in Optics as a Key to High Technology: 16th Congress of the International Commission for Optics. Akos Gy., Lippenyi T., Lubkovics G., and Podmaniczky A., Eds., Proc. SPIE. V. 1983. pp. 779-780 (1993).

Sokolov I.V. and Fofanov Ja.A. Multimode squeezed light and panoramic polarization microscopy. In ICONO'95: Atomic and Quantum Optics: High-Precision Measurements. Proc.SPIE. 1996, vol. 2799, pp. 384-388.

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