A large dispersion-managed monolithic all-fiber chirped pulse amplification system for high-energy femtosecond laser generation

Li, Feng; Zhao, Wei; Wang, Yishan; Wang, Na; Li, Qianglong; Yang, Yang; Wen, Wenlong

doi:10.1016/j.optlastec.2021.107684

Cited by 9 publications

(5 citation statements)

References 24 publications

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“…It can be seen that an effective method to reduce the B-integral of the main amplifier is shortening the corresponding lengths of the active and passive fibers, which have been optimized to 4.5 and 0.3 m (the pigtail of the collimator for delivery), respectively. Based on the actual experimental parameters, the calculated B-integrals of the pre-amplifiers are trivial, while that of the main amplifier is 1.64π radians at the operating power of 612 W. It should be noted that although the exponential approximation of the amplification profile along the active fiber may not accurately reflect the reality, it can still allow for a fairly good estimation of the exact B-integral and provide useful guidance for engineering the experimental system [ 27 , 32 , 33 , 35 ] . In this condition, through carefully adjusting the vertical distance of the compression gratings, the duration of the amplified pulse could be compressed to 1264 fs, assuming a Gaussian pulse envelope at the maximum output power, as shown in Figure 6(a).…”

Section: Resultsmentioning

confidence: 99%

“…The amplified laser pulse was outputted to the free space through a customized fiber collimator with integrated function of cladding mode stripping. It is noted that the employment of the collimator is beneficial for flexible delivery, however it has not been adopted in most of previous works [25,[29][30][31][32]. Finally, the collimated laser was compressed by a pair of transmission diffraction grating (130 mm × 15 mm in size), of which the line density is 1739 line/mm with a Littrow angle of 64°.…”

Section: Methodsmentioning

confidence: 99%

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High-power femtosecond laser generation from an all-fiber linearly polarized chirped pulse amplifier

Wang

Li²,

Ren³

et al. 2023

High Pow Laser Sci Eng

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An all-fiber high-power linear-polarized chirped pulse amplification (CPA) system is experimentally demonstrated. Through stretching the pulse duration to a full width of ~2 ns with two cascaded chirped fiber Bragg gratings (CFBGs), a maximum average output power of 612 W is achieved from a high gain Yb-doped fiber that has a core diameter of 20 μm with a slope efficiency of ~68% at the repetition rate of 80 MHz.At the maximum output power, the polarization degree is 92.5% and the M 2 factor of the output beam quality is ~1.29, and the slight performance degradations are attributed to the thermal effects in the main amplifier. By optimizing the B-integral of the amplifier and finely adjusting the higher order dispersion of one of the CFBGs, the pulse width is compressed to 863 fs at the highest power with a compression efficiency of 72%, corresponding to a maximum compressed average power of 440.6 W, single pulse energy of 5.5 μJ and peak power of about 6 MW 4.67MW. To the best of our knowledge, this is

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

High-power femtosecond laser generation from an all-fiber linearly polarized chirped pulse amplifier

Wang

Li²,

Ren³

et al. 2023

High Pow Laser Sci Eng

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“…As recently, an all-fiber CPA system emiting140 µJ (61.8 µJ after compression of 670 fs) amplified pulse by using the amplifier with 21 cm intensively Yb-doped SGF which has a core diameter of just 14 µm is demonstrated [21], this result has exhibited the big potential of the SGF not only in higher energy pulse amplification but also in the high damage threshold. A large dispersionmanaged monolithic all-fiber chirped pulse amplification system by using SGF as main amplifier for high-energy femtosecond laser generation was also demonstrated, and a record pulse energy of 170 µJ with pulse durations of 781 fs was achieved [22].…”

Section: Resultsmentioning

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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“…However, the nonlinearity in the fiber amplification pose a challenge in obtaining high-energy ultrashort pulses. Despite the use of techniques such as CPA and various large mode area fibers, including rod-type photonic crystal fiber [12], chirally-coupled core fiber [13] , heavily doped glass fiber [14] and tapered fiber [15], pulse energy remains constrained, typically ranging from tens to hundreds of microjoules.…”

mentioning

confidence: 99%

Hybrid Fiber-Single Crystal Fiber Chirped-Pulse Amplification System Emitting More Than 1.5 GW Peak Power With Beam Quality Better Than 1.3

Li,

Zhao,

et al. 2024

J. Lightwave Technol.

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A hybrid chirped pulse amplification system composed by the monolithic fiber pre-amplifier and a two-stage single-pass single crystal fiber amplifier was demonstrated. A maximum power of 68 W at the repetition rate of 100 kHz was obtained. The laser pulses were amplified and then compressed using a 1600 line/mm grating pair compressor. A short pulse duration of 358 fs and a power of 54 W were obtained at 100 kHz, corresponding to a peak power of 1.508 GW, to the best of our knowledge, this is the highest peak power ever obtained from single crystal fiber at repetition rate above 100 kHz due to the consideration of the third order dispersion which was engraved in the stretcher and the tuning capacity of higher-order dispersion compensation of chirped fiber Bragg grating. Additionally, the beam quality better than 1.3 was obtained. This high peak power CPA system with excellent comprehensive parameters will find various applications in scientific research and industrial applications.Index Terms-single crystal fiber; high peak power; chirped pulse amplification; high-order dispersion compensation.N the last decade, ultrafast lasers have found various applications in science and industry, e.g., attosecond generation[1], THz generation[2], ultrafast pump-probe spectroscopy[3], angle resolved photoemission spectroscopy [4], and material precision machining [5][6][7][8]. Most of these femtosecond lasers are configured in chirped pulse amplification architectures. Notable results with kilowatts average power have been reported by different Yb-doped gain mediums, such as the thin-disk amplifier[9], the innoslab amplifier[10] and Yb-doped fibers [11]. The thin-disk and innoslab lasers'inherent complexity and multiple passes of the laser beam with no optical wave guide pose a challenge for

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A large dispersion-managed monolithic all-fiber chirped pulse amplification system for high-energy femtosecond laser generation

Cited by 9 publications

References 24 publications

High-power femtosecond laser generation from an all-fiber linearly polarized chirped pulse amplifier

High-power femtosecond laser generation from an all-fiber linearly polarized chirped pulse amplifier

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

Hybrid Fiber-Single Crystal Fiber Chirped-Pulse Amplification System Emitting More Than 1.5 GW Peak Power With Beam Quality Better Than 1.3

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