28 December 1998 Brillouin scatter and Faraday effect isolators/nonreciprocal rotators for high-fluence multiple-pass amplifiers
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Proceedings Volume 3684, Laser Optics '98: Nonlinear and Coherent Optics; (1998) https://doi.org/10.1117/12.334829
Event: Laser Optics '98, 1998, St. Petersburg, Russian Federation
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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Steven M. Jackel, Inon Moshe, Raphael Lavi, Raphael Lallouz, "Brillouin scatter and Faraday effect isolators/nonreciprocal rotators for high-fluence multiple-pass amplifiers", Proc. SPIE 3684, Laser Optics '98: Nonlinear and Coherent Optics, (28 December 1998); doi: 10.1117/12.334829; https://doi.org/10.1117/12.334829
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