High-energy femtosecond laser system based on a fiber laser seeder, Yb:YAG single crystal fiber and chirped volume Bragg grating

Abstract

A high-energy chirped pulse amplification system based on a Yb doped fiber seeder, two-stage single crystal fiber (SCF) amplifier with a simple single-pass structure is demonstrated in this work. An amplified power of 52.2 W with a beam quality of less than 1.3 at 200 kHz is obtained, to our best knowledge, this is the highest power obtained with a single-pass amplification structure of the SCF with the energy of hundreds of microjoules. An excellent power stability of 0.32% is obtained. Dispersion between the chirped fiber Bragg grating (CFBG) stretcher and the chirped volume Bragg grating compressor is matched via the use of a self-made temperature tuning device of CFBG. As a result, a pulse duration of 740 fs and a compressed power of 31.4 W are obtained at a repetition rate of 200 kHz. In order to assess the influence of pulse duration induced by the nonlinearity during the amplification and increase the output pulse energy, the repetition rate of the self-made fiber seeder is changed to 100 kHz. A compressed power of 28.4 W and a pulse width of 858 fs are obtained, corresponding to a pulse energy of 284 µJ and a peak power of 331 MW. This compact and high-energy femtosecond laser system will find various applications in both scientific research and industrial implementation.

A compact femtosecond laser system based on homemade Yb:YAG single crystal fiber gain module with high pulse energy and good beam quality

“…In 2023, Li et al achieved laser power of 138.6 W at 1MHz by using single-stage SCF amplifier. The measured beam quality was 𝑀 𝑥,𝑦 2 = 1.56 x 1.44 [13]. In 2023, Li et al achieved laser power of 138.6 W at 1MHz by using single-stage SCF amplifier.…”

“…In 2023, Li et al achieved laser power of 138.6 W at 1MHz by using single-stage SCF amplifier. The measured beam quality was 𝑀 𝑥,𝑦 2 = 1.56 x 1.44 [13]. In the same year, Ivan et al firstly used Yb:YAG thin-taper-rod gain module to achieve 150W laser output.…”

Pencil-like periodic ridges under second Bragg incidence as dual-function beam separation

“…Nowadays, periodic diffraction has played an important role in many fields of engineering, especially in optoelectronic systems. For instance, it can be used in laser systems [1][2][3][4], optical communication systems [5][6][7], optical detection [8][9][10][11], and so on. Different parameters of the grating and incident conditions can cause different performance of the grating.…”