High peak power femtosecond cylindrical vector beams generation in a chirped-pulse amplification laser system

Abstract

Cylindrical vector beams (CVBs), with non-uniform state of polarizations, have become an indispensable tool in many areas of science and technology. However, little research has explored high power CVBs at the femtosecond regime. In this paper, we report on the generation of high quality CVBs with high peak power and femtosecond pulse duration in a fiber chirpedpulse amplification laser system. The radially (azimuthally) polarized vector beam has been obtained with a pulse duration of 440 fs (430 fs) and a maximum average output power of 20.36 W (20.12 W). The maximum output pulse energy is ∼20 μJ at a repetition rate of 1 MHz, corresponding to a high peak power of ∼46 MW. The comparison between simulated intensity profiles and measured experimental results suggests that the generated CVBs have a remarkable intensity distribution. The proposed configuration of our laser system provides a promising solution for high quality CVBs generation with the characteristics of high peak power, ultrashort pulse duration, and high mode purity.

A Promising Route to Compact and Economic Sub-15 fs, PW-Level Ti:Sapphire Lasers

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All-fiber laser amplification at 1948 nm based on double-cladding Tm/Al co-doped photonic crystal fiber fabricated by laser additive manufacturing

“…In 2020, Lee et al attained a linearly-polarized amplifier with 1.5 ns, 100 kHz pulse train, and up to 250 μJ pulse energy [8] . In addition to these, many new reports about ultrafast optics will probably be optimized using PCF in the future [9][10][11][12][13] . In the CW laser region, Jansen et al fabricated the large-area mode Tm-doped PCF and applied it to the laser.…”