Tech Area / Field. PHY-OPL: Physics / Optics and Lasers

PHY-OPL: Physics / Optics and Lasers

OBS-NAT: Other Basic Sciences / Natural Resources and Earth Sciences

Brief Description of Technology
We have performed investigations of optical parametric oscillators (OPO) and optical parametric amplifiers (OPA), which show the possibility of creating on the base of LiNbO₃ and LiIO₃ crystals effective parametric converters of radiation from Nd-lasers with pulse energy up to 1-2 J. It has been shown that the operation of such converters in both the "single-frequency" and "dual-frequency" regimes — with the line width not more than 0.2 cm^-1, and the spacing between the lines (in the "dual-frequency" regime) at 1.5-3.0 cm^-1 — is quite possible.

Legal Aspects
None.

Special Facilities in Use and Their Specifications
None.

Scientific Papers
F.I. Feldshtein, G.I. Freidman, V.V. Lozhkarev, G.A. Pasmanik, A.A. Shilov, I.V. Yakovlev. "Prospects of Using Parametric and SRS Oscillators and Amplifiers for Remote Spectroscopy of the Atmosphere and Image Amplification," Proc. SPIE, vol. 2797, 1996.

G.I. Freidman, G.A. Pasmanik, A.A. Shilov, D.G. Peterson. "Some New Possibilities to Design Frequency-Tunable Lidars in the IR (2:14 mm)," Proc. SPIE, vol. 2366, pp. 403-407, 1995.

A.A. Babin, N.N. Belyaeva, Yu.N. Belyaev, V.I. Bradikhin, F.I. Feldshtein, G.I. Freidman, A.V. Karov, V.N. Petryakov. "Powerful Tunable IR Sources Based on OPO, Parametrical and SRS Converters [in Russian]," Izv AN SSSR, Ser. Fiz., Vol. 48, No. 8, pp. 1511-1521, 1984.

G. Freidman, V. Lozhkarev, J. Partin, G. Pasmanik, D. Peterson, E. Shklovsky, I. Yakovlev. "Enhanced OPO/OPA IR Source," CLEO '97, Technical Digest, p. 456, 1997.

G. Freidman, V. Lozhkarev, A. Matveyev, J. Partin, G. Pasmanik, D. Peterson, E. Shklovsky, I. Yakovlev. "Raman Converter of Tunable Radiation into Mid/Far IR with Large Shift of Stokes Wavelength," CLEO'97.

Active Sounding of the Atmosphere by Powerful Microwave Radiation
PRA-0078

Full Title
Active Sounding of the Atmosphere by Powerful Microwave Radiation
Tech Area / Field

OBS-NAT: Other Basic Sciences / Natural Resources and Earth Sciences

Brief Description of Technology
At present the importance of the microwave monitoring of clouds and aerosols is evident. This is a unique tool for investigating a wide class of water and ice clouds, as well as some air pollutions, which are practically "invisible" for centimeter wavelength meteoradars and, at the same time, opaque for optical radiation. In recent years a number of proposals have been formulated to use modern, high-power electron cyclotron masers (gyrotrons) for microwave monitoring with high sensitivity. Our experiments are based on the use of unique microwave generators (gyrotrons) created in IAP RAS, and the highly sensitive receivers also constructed in IAP. To interpret the experimental results, detailed numerical simulation will be performed of the scattering processes in different types of clouds and in the clear atmosphere. These experiments will allow us to investigate a number of effects in the atmosphere, such as: Rayleigh and non-Rayleigh scattering mechanisms, multiple scattering and the depolarization of radiation. Provided the device is created with this experimental technique, it will demonstrate good performance as a bistatic meteoradar and will be further developed to constitute a basis for a powerful mobile sounding system.

Legal Aspects
None.

Special Facilities in Use and Their Specifications
None.

Scientific Papers
Manheimer W.M., Mesyats G.A., Petelin M.I. “Applications of High Power Microwave Sources to Enhanced Radar Systems,” Applications of High Power Microwaves, Eds. A.V.Gaponov-Grekhov, V.L. Granatstein, Artech House, Boston, London, p. 364, 1994.

Bykov Yu.V., Dryagin Yu.A., Eremeev A.G., Kukin L.M., Lebsky Yu.V., Mocheneva O.S., Tokman M.D. “High-Power Microwave Radiation Scattering in the Clear Atmosphere,” Izv. AN, Fizika Atmosfery i Okeana, v. 32, No. 1. pp. 84-87, 1996.

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