Generation of 40 W, 400 fs pulses at 1 MHz repetition rate from efficient, room temperature Yb:YAG double-pass amplifier seeded by fiber CPA system

Veselis, Laurynas; Bartulevičius, Tadas; Madeikis, Karolis; Michailovaś, Andrejus

doi:10.1117/12.2545473

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Single Crystal Fiber (SCF) has gained attention from researchers due to its ability to confine the pump light within its aperture, resulting in better matching of the signal light with the pump light and enhanced amplification efficiency 11 . However, recent studies have shown that, at the same pumping level, single-crystal fiber does not exhibit better amplification performance than ytterbium-doped yttrium-aluminium-garnet (Yb:YAG) rod crystals 12 . The amplification efficiency of ytterbium-doped materials has been effectively improved with the increasing brightness of pump LD.…”

Section: Introductionmentioning

confidence: 99%

396-MHz 1030-nm hybrid CPA amplifier based on fiber-Yb:YAG crystal thin rod

Luo,

Li,

Wang

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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The paper presents the design of a high repetition frequency, high-energy femtosecond laser system for industrial processing. For the first time, we employed a hybrid chirped-pulse amplification (CPA) system based on 396 MHz high repetition frequency femtosecond pulses generated from optical fiber and thin rod Yb:YAG crystals. The ultrashort pulsed all-fiber front-end pulse train was chosen at 25 kHz, resulting in an average output power of 13.76 W. The output laser had a central wavelength of 1030 nm with a spectral width of 3.5 nm. The compressed pulse width was measured to be 791 fs, and the pulse train energy reached 550 μJ. The linearly polarized ultrashort pulsed laser exhibited excellent power stability of 0.49%. The beam quality was characterized by M x 2 =1.21 and M y 2 =1.23. It is worth noting that the combined use of optical fiber and crystal rods in the amplifier structure effectively mitigates the strong nonlinear effect of the optical fiber on peak power enhancement. The femtosecond laser system demonstrates remarkable features, including high repetition frequency, high burst energy, high power stability, superior spot quality, as well as costeffectiveness and reliability. Therefore, it is deemed to be an ideal choice for femtosecond laser applications in the field of ultrashort pulse industrial processing.

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Section: Introductionmentioning

confidence: 99%

396-MHz 1030-nm hybrid CPA amplifier based on fiber-Yb:YAG crystal thin rod

Luo,

Li,

Wang

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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show abstract

“…Amplifiers with a fiber solid-state hybrid structure can overcome the limitations of the nonlinear effect to some extent while maintaining most of the advantages of fiber lasers [7][8][9]. However, there are some difficulties with this kind of laser structure.…”

Section: Introductionmentioning

confidence: 99%

Hundred watt level and high energy compact hybrid fiber femtosecond laser with good beam quality

Li¹,

Liu²,

Zhao³

et al. 2023

Laser Phys. Lett.

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A hundred watt level compact femtosecond laser system comprised of a high gain, low nonlinearity silicate glass fiber amplifier and a highly efficient Yb:YAG single-crystal fiber amplifier is demonstrated. By reducing the harmful thermal lens effect of amplifiers and optical elements, and precisely tuning dispersion of the stretcher, 110 W, 495 fs laser output at 1 MHz repetition rate and 250 μJ, 494 fs laser output at 200 kHz repetition rate are obtained. An optimized beam-quality factor (M 2) of better than 1.3 is obtained by filtering the beam with a small-aperture diaphragm. To our best knowledge, this is the first demonstration of such a hybrid femtosecond laser over 100 W and 100 μJ with good beam quality.

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“…In 2019, Chu et al demonstrated a master oscillator power amplifier (MOPA) laser system with a Yb:KGW oscillator and two Yb:YAG amplifiers to directly amplify a signal with a pulse width of 1.87 ps and repetition rate of 1 MHz; an output power of 8.2 W was obtained with a pulse width of 4.66 ps [22]. In 2020, Veselis used a 3.6 at.% doped Yb:YAG rod with a length of 12 mm to generate an average power of 40 W at 1 MHz [23]. However, highly doped short rods led to deleterious thermal effects that were not conducive to high power amplification.…”

Section: Introductionmentioning

confidence: 99%

Compact 80 W, 1 MHz Femtosecond Chirped Pulse Amplification Laser System Based on a Yb-Doped Fiber and a Yb:YAG Thin Rod

Peng

Shi

et al. 2022

IEEE Photonics J.

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We present a hybrid chirped pulse amplification (CPA) laser system based on Yb-doped fiber and Yb:YAG thin rod. The laser system demonstrates a novel approach to generate high average power up to the 100-W level by using a Yb:YAG thin rod without pump guiding at room temperature. A Yb-doped allfiber laser with an output power of 7 W and a repetition rate of 1 MHz is amplified to an output power of 126.2 W in simple and compact two-stage amplifiers consisting of a single fiber crystal (SCF) and a Yb:YAG thin rod. To the best of our knowledge, this is the highest output power of Yb:YAG thin-rod amplifier with good beam quality obtained without pump guiding at room temperature. After using a thin-film polarizer (TFP) to remove the thermal depolarization, a linearly polarized ultrashort pulse laser with an average power of 115.2 W is obtained. An output power of 80.6 W with a pulse width of 580 fs is achieved after pulse compression. The central pulse contains 84.1% of the total pulse energy, corresponding to a pulse peak power of 116.9 MW.

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Generation of 40 W, 400 fs pulses at 1 MHz repetition rate from efficient, room temperature Yb:YAG double-pass amplifier seeded by fiber CPA system

Cited by 6 publications

References 23 publications

396-MHz 1030-nm hybrid CPA amplifier based on fiber-Yb:YAG crystal thin rod

396-MHz 1030-nm hybrid CPA amplifier based on fiber-Yb:YAG crystal thin rod

Hundred watt level and high energy compact hybrid fiber femtosecond laser with good beam quality

Compact 80 W, 1 MHz Femtosecond Chirped Pulse Amplification Laser System Based on a Yb-Doped Fiber and a Yb:YAG Thin Rod

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