Generation of high-order harmonics radiation in laser plasma
- NPO Akadempribor, Tashkent (Uzbekistan)
Investigation of nonlinear optical effects (harmonics generation, CARS and so on) which take place in low-excited laser-generated plasma have a number of distinctions from the experiments of high-intensive (10{sup 16}--10{sup 18} W/cm{sup 2}) light fields interactions with a dense laser plasma. In particular, optical harmonics generation in visible and near ultraviolet (UV) ranges was investigated in laser plasma generated after an optical breakdown in gases and at metal surface with the intensity of 10{sup 10}--10{sup 12} W/cm{sup 2}. One of the mechanisms which is considerably increase an efficiency of multiphoton processes (for example, harmonics generation) at optical breakdown (or other methods of media excitation) is an enhancement of high-order nonlinear susceptibilities caused by an atoms and ions excited levels occupancy in low-temperature plasma. In these works a converted radiation lies in a visible, near UV as well as a vacuum ultraviolet (VUV) ranges for the case of gas ionization by the laser radiation focused in a gas jet. An analysis of these works leads to the conclusion that harmonics generation (HG) in low-temperature plasma can be used for creation of coherent UV and VUV radiation sources as well as a technique of HG in a gas jet. In this article an investigation of HG in low-temperature plasma which lies in UV and VUV range has been described. Here the authors consider the high-order HG and frequency conversion optimization depending on the radiation and nonlinear media characteristics. They have observed HG in (i) an atmospheric plasma, when the target plasma serves as an operating mechanism for atmospheric plasma formation and (ii) in target plasma placed in vacuum chamber.
- OSTI ID:
- 379755
- Report Number(s):
- CONF-9507222-; ISBN 0-8194-1882-X; TRN: IM9644%%211
- Resource Relation:
- Conference: SPIE applications of laser plasma radiation II, San Diego, CA (United States), 12-14 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Applications of laser plasma radiation 2; Richardson, M.C.; Kyrala, G.A. [eds.]; PB: 333 p.; Proceedings/SPIE, Volume 2523
- Country of Publication:
- United States
- Language:
- English
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