Polarization state control for high peak power applications

TL;DR

This paper demonstrates that a simple PET film can effectively control the polarization state of high peak power ultrashort laser pulses, offering a durable and straightforward alternative to complex polarization control methods in extreme science applications.

Contribution

The study introduces a novel, simple, and durable method using PET film for polarization control of high peak power ultrashort pulses, avoiding complex multi-mirror schemes.

Findings

PET film achieves ellipticity of ~0.8 with negligible phase distortion.

The film withstands 1000 shots at high intensity without damage.

Experimental validation with 1 TW laser confirms effectiveness.

Abstract

Numerous applications in the extreme field science are possible with circularly polarized high peak power ultrashort pulses. Commonly used quarter wave plates are not applicable here, while multi-mirror schemes are very complicated. We showed that the simple PET film $\approx$20 $\mu$m thick can be used to control the polarization state of the high peak power beam and achieve ellipticity of $\approx$0.8 with negligible nonlinear phase distortion. The film can withstand $10^3$ shots at intensity of $I = 3 \cdot 10^{12}$ W/cm$^2$ without visible damage. Thus, for a PW laser system and beam diameter of 20 cm the PET film can be used for quite a long time. We proved this experimentally using 1 TW femtosecond Ti:Sa laser measuring the angular distribution of the second harmonic from the plasma channel created in an undercritical gas plume.