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Updated: Sep 11, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Polarization state control for high-peak-power applications
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The use of circularly polarized high-peak-power ultrashort pulses has various applications in extreme field science. Commonly used quarter-wave plates are unsuitable here, while multi-mirror schemes are technically complicated. We have demonstrated that simple PET film, 20.5µm thick, can be used to manipulate the polarization state of the high-peak-power beam and achieve ellipticity of up to 0.8 with negligible nonlinear phase distortion. Furthermore, the film can withstand 103 shots at an intensity of I=3⋅1012W/cm2 without sustaining visible damage. Thus, PET film is suitable for long-term use in a PW laser system, with a 20 cm beam diameter. We confirmed this experimentally by measuring the angular distribution of the second harmonic from the plasma channel created in an undercritical gas plume, with a 1 TW femtosecond Ti:Sa laser.
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