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Proceedings Paper

Brillouin scatter and Faraday effect isolators/nonreciprocal rotators for high-fluence multiple-pass amplifiers
Author(s): Steven M. Jackel; Inon Moshe; Raphael Lavi; Raphael Lallouz
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Paper Abstract

A high-energy phase-conjugate mirror (PCM)/Nonlinear Isolator (NLI) based on pressurized methane was tested to the 5 J level, using 200 ns, 300 MHz bandwidth pulses from a phase conjugated multiple Nd:glass amplifier. Performance was good when a 50 cm focal length lens was employed. With a 25 cm lens, PCM performance was good except when gas breakdown occurred. In the presence of gas breakdown, reflectivity and return beam quality dropped. NLI isolation was aided by breakdown. A model was developed that shows that if breakdown occurs for a short focal length lens, then increasing the focal length raises the breakdown threshold but does not eliminate the problem at all input energies. This is a consequence of the fact that as input energy increases, the amount of energy leaking into the focal region increases faster than the breakdown threshold increase due to temporal broadening of the leaked pulse. High reflectivity (> 80%) single-cell tight-focus PCMs are feasible for use at the 10 J level, but as an NLI appears limited compared to glass based Faraday rotators.

Paper Details

Date Published: 28 December 1998
PDF: 14 pages
Proc. SPIE 3684, Laser Optics '98: Nonlinear and Coherent Optics, (28 December 1998); doi: 10.1117/12.334829
Show Author Affiliations
Steven M. Jackel, Soreq Nuclear Research Ctr. (Israel)
Inon Moshe, Soreq Nuclear Research Ctr. (Israel)
Raphael Lavi, Soreq Nuclear Research Ctr. (Israel)
Raphael Lallouz, Soreq Nuclear Research Ctr. (Israel)

Published in SPIE Proceedings Vol. 3684:
Laser Optics '98: Nonlinear and Coherent Optics
Vladimir E. Sherstobitov, Editor(s)

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