All-Fiber Chirped-Pulse Amplifier Emitting 670 fs Pulses With 92 MW Peak Power

Bobkov, Konstantin K.; Lipatov, Denis S.; Salgansky, M. Yu.; Guryanov, A. N.; Бубнов, М. М.; Likhachev, Mikhail E.

doi:10.1109/lpt.2022.3196276

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…However, it is better to study the operation of SGF amplifiers and SCF amplifiers at higher energy and average power levels. 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: 88%

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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Section: Resultsmentioning

confidence: 88%

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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“…In [9], there is a large pedestal in autocorrelation trace of the pulses, which we attribute to the presence of high-order modes (HOM). Similar amplifier design, but with a perfectly single-mode propagation regime, was demonstrated by our group in [10]. In this case, an input core diameter of an LMA tapered fiber was reduced down to 14 µm, which allowed us to achieve the first HOM cut-off of 0.95 µm relative to a Ge-doped pedestal surrounding the core.…”

Section: Introductionmentioning

confidence: 81%

Monolithic Side-Pumped Amplifier Based on an Yb-Doped Tapered-Fiber and Yielding 0.53 MW 9.3 ps Pulses

et al. 2022

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We demonstrated a simple design of a monolithic all-fiber side-coupled combiner for counter-pumped amplifiers that requires no special fiber processing systems for fabrication. The combiner based on a Yb-doped polarization-maintained tapered fiber with an output core diameter of 40 µm and a total length of 1.8 m exhibiting over 60% coupling efficiency of 976 nm 0.10 NA pump power was demonstrated and utilized to amplify 1064 nm 9.3 ps 1.84 MHz pulses up to 9.1 W of average power and 0.53 MW of peak power with near diffraction-limited beam quality. The demonstrated approach seems promising for further power scaling, retaining good output beam characteristics via design optimization.

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“…Thus, the previously obtained absorption from the cla at the level of 24 dB/m and a wavelength of 976 nm can be increased only by usi design of fiber with a pedestal [12,29], which in turn actually excludes the possib creating a polarization-maintaining fiber. In addition, in the case of increasing abso from the cladding, the thermal load per unit length of the fiber increases significantl leads to a sharp decrease in the maximum average output power that can be ext from the amplifier based on such a fiber [29] and, as a consequence, significantly the scope of application of such amplifiers. Thus, the ytterbium concentration and ometric dimensions of the core and cladding of the tapered fiber used in [17,26] app be close to optimal.…”

Section: Tapered Fiber Designmentioning

confidence: 99%

“…In addition, in the case of increasing absorption from the cladding, the thermal load per unit length of the fiber increases significantly. This leads to a sharp decrease in the maximum average output power that can be extracted from the amplifier based on such a fiber [29] and, as a consequence, significantly limits the scope of application of such amplifiers. Thus, the ytterbium concentration and the geometric dimensions of the core and cladding of the tapered fiber used in [17,26] appear to be close to optimal.…”

Section: Tapered Fiber Designmentioning

confidence: 99%

Picosecond Pulse Tapered Fiber Amplifier Operated near 1030 nm with Peak Power up to 1 MW

Mikhailov,

Bobkov,

Levchenko

et al. 2023

Photonics

Self Cite

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We demonstrated an optimization of a picosecond fiber amplifier based on Yb-doped tapered fiber in a spectral range of 1030 nm. Nonlinear effects limiting peak power scaling (stimulated Raman scattering and four-wave mixing) were studied and factors affecting their threshold were established, such as gain, diameter profile along the length of taper, output mode field diameter, and numerical aperture of a pump. By determining the optimal amplification regime and manufacturing advanced tapered fibers, we amplified 13 ps pulses to a record-high peak power of 1 MW at a wavelength of 1029 nm directly at the output of the fiber at an average power of 13.8 W. Four-wave mixing was the limiting factor, and the total fraction of deleterious components in the output spectrum was ~2%. The quality of the output beam was close to being diffraction limited (M2 < 1.2).

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All-Fiber Chirped-Pulse Amplifier Emitting 670 fs Pulses With 92 MW Peak Power

Cited by 10 publications

References 14 publications

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

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

Monolithic Side-Pumped Amplifier Based on an Yb-Doped Tapered-Fiber and Yielding 0.53 MW 9.3 ps Pulses

Picosecond Pulse Tapered Fiber Amplifier Operated near 1030 nm with Peak Power up to 1 MW

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