Numerical simulation of a Q-switched cw chemical HF laser

Journal Article · Sat Mar 31 04:00:00 EDT 2007 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2007V037N03ABEH013359· OSTI ID:21466638

Kuprenyuk, V I ^[1]; Maksimov, Yurii P; Mashendzhinov, Viktor I; Rotinyan, Mikhail A; Fedorov, Igor' A ^[2]; Rodionov, A Yu

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1. Institute for Laser Physics, Federal State Unitary Enterprise ' Scientific and Industrial Corporation 'Vavilov State Optical Institute', St. Petersburg (Russian Federation)
2. Russian Science Centre 'Applied Chemistry', St Petersburg (Russian Federation)

A mathematical model of a Q-switched cw chemical laser is developed. The model is based on a simplified description of the active medium and the exact wave description of the mode structure of radiation. The model is used to study numerically the spatial-angular parameters of the output beam of a HF laser. We considered an unstable cavity that provided a high stability of the axis of the laser-pulse radiation pattern upon Q-switching with the help of a rotating mirror. The results of numerical simulation showed that for typical dimensions of a plane or an unstable cavity of the positive branch in a cw chemical laser, the angular radiation divergence rapidly changes in time and on average exceeds the diffraction limit by an order of magnitude. The problem can be solved by replacing a rotating mirror Q switch by a fixed one with time-dependent transmission. We also considered a negative-branch unstable cavity which can provide a stable radiation divergence upon Q-switching produced by a rotating mirror. (lasers)

• OSTI ID: 21466638
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 3 Vol. 37; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAMS
CHEMICAL LASERS
COHERENT SCATTERING
COMPUTERIZED SIMULATION
DIFFRACTION
FLUORINE COMPOUNDS
HALOGEN COMPOUNDS
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INORGANIC COMPOUNDS
LASER CAVITIES
LASERS
MATHEMATICAL MODELS
MIRRORS
PHOTON BEAMS
PULSES
Q-SWITCHING
SCATTERING
SIMULATION
STABILITY
TIME DEPENDENCE