Old Wavelength, New Performance: Hectowatt 200-μJ-Level Femtosecond Fiber CPA System at 1064 Nm

The Yb:fiber based high-power and high-energy ultrafast lasers usually feature central wavelength of 1030 nm instead of the more common one of 1064 nm, thus limiting some potential wavelength-dependent applications. In this work, a hectowatt 1064-nm femtosecond chirped pulse amplification (CPA) syst...

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Veröffentlicht in:Journal of lightwave technology 2024-03, Vol.42 (5), p.1659-1666
Hauptverfasser: Wang, Shang, Zhao, Qikai, Gao, Guanguang, Cong, Zhenhua, Liu, Zhaojun, Zhao, Zhigang
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container_end_page 1666
container_issue 5
container_start_page 1659
container_title Journal of lightwave technology
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creator Wang, Shang
Zhao, Qikai
Gao, Guanguang
Cong, Zhenhua
Liu, Zhaojun
Zhao, Zhigang
description The Yb:fiber based high-power and high-energy ultrafast lasers usually feature central wavelength of 1030 nm instead of the more common one of 1064 nm, thus limiting some potential wavelength-dependent applications. In this work, a hectowatt 1064-nm femtosecond chirped pulse amplification (CPA) system based on double-stage rod-type photonic crystal fiber (PCF) amplifier was demonstrated, with a pulse energy of 212-μJ and a repetition rate of 0.5 MHz. Compared with our previous work [Opt. Express 30(6), 3611, 2022], two key measures were employed. Firstly, a Yb:YAG crystal was intentionally introduced as a spectral filter for avoiding 1030-nm amplified spontaneous emission (ASE) oscillation, which hence improved the signal-to-noise ratio (SNR) by 15 dB. Secondly, an additional stage of rod-type PCF amplifier was adopted for further power scaling, achieving an average power of 127 W. Finally, the pulse was compressed to ∼460 fs, with an average power of 106 W and a compression efficiency of ∼83%. The beam quality factors (M 2 ) were measured to be M2 X = 1.12 and M2 Y = 1.09. To the best of our knowledge, this is the highest pulse energy among 1064-nm hectowatt-level femtosecond lasers, thus providing a high-quality source for wavelength-dependent applications. For example, it can be used as a driver for high-repetition-rate vacuum ultraviolet (VUV) sources about 10.5 eV, with an expected conversion efficiency of up to 1%.
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subjects Amplifiers
Chirped pulse amplification
Crystal fibers
Crystals
Femtosecond pulsed lasers
fiber amplifiers
Fiber lasers
Laser theory
Mirrors
Optical fiber amplifiers
Optical fiber polarization
Oscillators
photonic crystal fiber
Photonic crystals
Repetition
Signal to noise ratio
Spontaneous emission
Ultrafast lasers
title Old Wavelength, New Performance: Hectowatt 200-μJ-Level Femtosecond Fiber CPA System at 1064 Nm
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