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

Wang, Tao; Li, Can; Ren, Bo; Guo, Kun; Wu, Jian; Leng, Jinyong; Zhang, Pu

doi:10.1017/hpl.2023.12

Cited by 17 publications

(8 citation statements)

References 39 publications

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“…It should be noted that in an all-fiber laser amplifier, the active and passive fibers with relatively small diameter for fusion splicing and long transmission length for connection would cause significant nonlinear effects, hindering the scale of the output power [18,19]. At present, the maximum output average power from the all-PM fiber CPA in the 2.0 μm range is 314 W [20], which is much lower than that from the free-space coupled counterparts.…”

Section: Introductionmentioning

confidence: 91%

Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers

Ren,

Chang,

et al. 2024

Front. Optoelectron.

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In this paper, we report a coherent beam combining (CBC) system that involves two thulium-doped all-polarization maintaining (PM) fiber chirped pulse amplifiers. Through phase-locking the two channels via a fiber stretcher by using the stochastic parallel gradient descent (SPGD) algorithm, a maximum average power of 265 W is obtained, with a CBC efficiency of 81% and a residual phase error of λ/17. After de-chirping by a pair of diffraction gratings, the duration of the combined laser pulse is compressed to 690 fs. Taking into account the compression efficiency of 90% and the main peak energy proportion of 91%, the corresponding peak power is calculated to be 4 MW. The laser noise characteristics before and after CBC are examined, and the results indicate that the CBC would degrade the low frequency relative intensity noise (RIN), of which the integration is 1.74% in [100 Hz, 2 MHz] at the maximum combined output power. In addition, the effects of the nonlinear spectrum broadening during chirped pulse amplification on the CBC efficiency are also investigated, showing that a higher extent of pulse stretching is effective in alleviating the spectrum broadening and realizing a higher output power with decent combining efficiency. Graphical Abstract

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Section: Introductionmentioning

confidence: 91%

Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers

Ren,

Chang,

et al. 2024

Front. Optoelectron.

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“…In the context of the power scaling of ultrafast fiber lasers, it is imperative to mitigate the nonlinear effects, including stimulated Raman scattering (SRS) and nonlinear phase accumulation, as well as the transverse mode instability (TMI) effect [5][6][7] . Up to date, the average power of ultrafast fiber lasers has approached more than 1 kW based on the free-space coupled structure [8] ; whereas for the all-fiber configuration, the highest power of the ultrafast laser operating in the single pulse mode is 440.6 W at a repetition rate of 80 MHz [9] . For a repetition rate up to GHz, it makes the high-power amplification more reliable and the pulse sequence manipulation more flexible, e.g., burst mode operation, particularly in an all-fiber configuration.…”

Section: Introductionmentioning

confidence: 99%

High-power all-fiber linearly polarized Yb-doped chirped pulse amplifier based on active polarization control

Wang,

Ren,

Chang

et al. 2024

中国光学快报

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High-power ultrafast laser amplification based on a non-polarization maintaining fiber chirped pulse amplifier is demonstrated. The active polarization control technology based on the root-mean-square propagation (RMS-prop) algorithm is employed to guarantee a linearly polarized output from the system. A maximum output power of 402.3 W at a repetition rate of 80 MHz is realized with a polarization extinction ratio (PER) of > 11.4 dB. In addition, the reliable operation of the system is verified by examining the stability and noise properties of the amplified laser. The M 2 factor of the laser beam at the highest output power is measured to be less than 1.15, indicating a diffraction-limited beam quality. Finally, the amplified laser pulse is temporally compressed to 755 fs with a highest average power of 273.8 W. This is the first time, to the best of our knowledge, that the active polarization control technology was introduced into the high-power ultrafast fiber amplifier.

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“…Over the last decade, the fiber laser community has witnessed the impressive progress of high-power ultrafast fiber lasers in the near-infrared band, mostly facilitated by the fast development of large mode area (LMA) ytterbiumdoped fiber and relevant components that can be exploited with the well-known chirped pulse amplification (CPA) scheme, as well as driven by various applications [1][2][3][4][5][6][7] . For some applications such as special material processing, high harmonic generation, optical parametric oscillators and midinfrared broadband supercontinuum generation [8][9][10][11] , not only the power scaling but also the operation wavelength extending to a longer spectral range is required.…”

Section: Introductionmentioning

confidence: 99%

Thulium-doped all-PM fiber chirped pulse amplifier delivering 314 W average power

Ren

Wang

et al. 2023

High Pow Laser Sci Eng

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A high-power all polarization-maintaining (PM) chirped pulse amplification (CPA) system operating in the 2.0 μm range is experimentally demonstrated. Large mode area (LMA) thulium-doped fiber (TDF) with a core/cladding diameter of 25/400 μm is employed to construct the main amplifier. Through dedicated coiling and cooling of the LMA-TDF to manage the loss of the higher order mode and thermal effect, a maximum average power of 314 W with a slope efficiency of 52% and polarization extinction ratio of 20 dB is realized. The pulse duration is compressed to 283 fs with a grating pair, corresponding to a calculated peak power of 10.8 MW, considering the compression efficiency of 88% and the estimated Strehl ratio of 89%. Moreover, through characterizing the noise properties of the laser, an integrated relative intensity noise of 0.11% at 100 Hz−1 MHz is obtained at the maximum output power, whereas the laser timing jitter is degraded by the final amplifier from 318 to 410 fs at an integration frequency of 5 kHz to 1 MHz, owing to the self-phase modulation effect-induced spectrum broadening. The root-mean-square of long-term power fluctuation is tested to be 0.6%, verifying the good stability of the laser operation. To the best of our knowledge, this is the highest average power of an ultrafast laser realized from an all-PM-fiber TDF-CPA system ever reported.

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

Cited by 17 publications

References 39 publications

Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers

Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers

High-power all-fiber linearly polarized Yb-doped chirped pulse amplifier based on active polarization control

Thulium-doped all-PM fiber chirped pulse amplifier delivering 314 W average power

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