Simulations of spectral broadening by cross-phase modulation (XPM) with chaotic light pulses

Mark A. Henesian; Sham N. Dixit; Chien-Jen Chen; Ping-Kong A. Wai; Curtis R. Menyuk

doi:10.1117/12.154481

1 May 1993 Simulations of spectral broadening by cross-phase modulation (XPM) with chaotic light pulses

Mark A. Henesian, Sham N. Dixit, Chien-Jen Chen, Ping-Kong A. Wai, Curtis R. Menyuk

Proceedings Volume 1870, Laser Coherence Control: Technology and Applications; (1993) https://doi.org/10.1117/12.154481
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Spectral broadening of single-frequency laser pulses by optical cross-phase modulation (XPM) with chaotic laser pulses in birefringent single-mode optical fibers is investigated numerically and results are compared with experiments. By this process we have generated laser pulses of variable bandwidth (1 - 25 angstrom) at the fundamental wavelength (1053 nm) for amplification in high power solid-state Nd:glass lasers used for inertial confinement fusion research. Simulations indicate that a temporally smooth XPM pulse can be generated with intensity fluctuations of less than 10% and spectral width greater than 50 angstrom using a short length (approximately 5 m) of special low dispersion and low birefringence fiber, e.g., D equals 10 ps/nm-km (normal dispersion) and (Delta) n equals 2 X 10^-5. Readily available fibers of similar length, with parameters of D equals 40 ps/nm-km and (Delta) n equals 6 X 10^-5, can give spectral widths exceeding 25 angstroms, but the noise will range from 25 to 60%. Broadband laser pulses generated by XPM are now routinely used at Lawrence Livermore National Laboratory for active smoothing of the laser irradiance on targets by the technique of smoothing-by-spectral dispersion.

Citation Download Citation

Mark A. Henesian, Sham N. Dixit, Chien-Jen Chen, Ping-Kong A. Wai, and Curtis R. Menyuk "Simulations of spectral broadening by cross-phase modulation (XPM) with chaotic light pulses", Proc. SPIE 1870, Laser Coherence Control: Technology and Applications, (1 May 1993); https://doi.org/10.1117/12.154481

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