Compensation of optical nonlinearities in a femtosecond laser system in a broad operation regime

Černe, Luka; Šušnjar, Peter; Petkovšek, Rok

doi:10.1016/j.optlastec.2020.106706

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…Černe et al published a study on the relationship between the evolution of Strehl ratio and pulse duration with different repetition rates and B-integral values (up to 14 rad) [3]. Building on this research, we present an analysis of the degradation of Sech 2 and parabolic-shaped pulses in the presence of increasing nonlinearity in the optical chain.…”

Section: Introductionmentioning

confidence: 88%

High non-linearities effects on pulse quality in a CPA system and mitigation strategies

Maurel

Brown-Dussault

Gagnon

et al. 2023

Components and Packaging for Laser Systems IX

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In this paper we study the pulse quality degradation of an Ytterbium-based fiber laser in which B-integral ranges from 5 to 20 rad. A tunable chirped-fiber-Bragg-grating stretcher is optimized in term of reflectivity and phase profiles thank to a multivariable optimization algorithm. Parabolic and Sech2 spectral profiles are both studied in order to evaluate their robustness to non-linear degradation. Phase and reflectivity optimization can provide insight to design tailored specific pulse stretchers for CPA systems.

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Section: Introductionmentioning

confidence: 88%

High non-linearities effects on pulse quality in a CPA system and mitigation strategies

Maurel

Brown-Dussault

Gagnon

et al. 2023

Components and Packaging for Laser Systems IX

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“…The solid-state amplification stage is needed to reduce the undesired nonlinear effects that occur due to high pulse intensities in the fiber amplifiers due to small core diameters of optical fibers [39]. The beam size in the solid-state amplifier is much larger compared to the fiber core size, which allows for additional pulse amplification with negligible nonlinear effects [40]. Fiber amplifiers are pumped with 976 nm laser diodes whereas the solid-state amplifier (Yb:YAG) is pumped with 969 nm laser diode.v The system is designed in a MOPA configuration with two gain switched diodes used as a seed module (a).…”

Section: Shg-based Separationmentioning

confidence: 99%

Pulse-on-demand laser operation from nanosecond to femtosecond pulses and its application for high-speed processing

Petelin

Černe

Mur

et al. 2021

Advanced Optical Technologies

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In this manuscript we present a true pulse-on-demand laser design concept using two different approaches. First, we present a fiber master oscillator power amplifier (MOPA) based quasi-continuous wave (CW) laser, working at high modulation bandwidths, for generation of nanosecond pulses. Second, we present a hybrid chirped pulse amplification (CPA)-based laser, combining a chirped-pulse fiber amplifier and an additional solid-state amplifier, for generation of femtosecond pulses. The pulse-on-demand operation is achieved without an external optical modulator/shutter at high-average powers and flexible repetition rates up to 40 MHz, using two variants of the approach for near-constant gain in the amplifier chain. The idler and marker seed sources are combined in the amplifier stages and separated at the out using either wavelength-based separation or second harmonic generation (SHG)-generation-based separation. The nanosecond laser source is further applied to high throughput processing of thin film materials. The laser is combined with a resonant scanner, using the intrinsic pulse-on-demand operation to compensate the scanner’s sinusoidal movement. We applied the setup to processing of indium tin oxide (ITO) and metallic films on flexible substrates.

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“…The nonlinear optical effects introduce nonlinear spectral and temporal phase to laser pulses. This nonlinear phase cannot be easily compensated for with a pulse compressor, resulting in decreased quality of compressed pulses [12,13]. This is especially true in fiber lasers, where the high-energy pulses are confined to a small fiber core.…”

Section: Introductionmentioning

confidence: 99%

“…There have been many methods already demonstrated that allow for tunable compensation of the nonlinear phase such as the use of different pulse-shaping techniques in a feedback loop with a pulse characterization technique at the laser output [24][25][26][27][28][29]. It was recently shown that a tunable chirped fiber Bragg grating (TCFBG) can efficiently compensate nonlinear phase up to 4π [12]. As a TCFBG can also be used as a pulse stretcher in a chirped pulse amplification technique (CPA), its use for nonlinear phase compensation offers a clear advantage in terms of compactness and robustness compared to the use of spatial light modulators (SLM-s) or other pulse-shaping techniques [30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Nonlinear Phase Compensation in a Femtosecond Hybrid Laser with Varying Pulse Repetition Rate

2021

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In this manuscript, an implementation of a tunable nonlinear phase compensation method is demonstrated on a typical femtosecond hybrid laser consisting of a fiber pre-amplifier and an additional solid-state amplifier. This enables one to achieve constant laser pulse parameters over a wide range of pulse repetition rates in such a laser. As the gain in the solid-state amplifier is inversely proportional to the input power, the shortfall in the solid-state gain at higher repetition rates must be compensated for with fiber pre-amplifier to ensure constant pulse energy. This increases the accumulated nonlinear phase and consequently alters the laser pulse parameters such as pulse duration and Strehl ratio. To overcome this issue, the nonlinear phase must be compensated for, and what is more it should be compensated for to a different extent at different pulse repetition rates. This is achieved with a tunable CFBG, used also as a pulse stretcher. Using this concept, we demonstrate that constant laser pulse parameters such as pulse energy, pulse duration and Strehl ratio can be achieved in a hybrid laser regardless of the pulse repetition rate.

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Compensation of optical nonlinearities in a femtosecond laser system in a broad operation regime

Cited by 7 publications

References 41 publications

High non-linearities effects on pulse quality in a CPA system and mitigation strategies

High non-linearities effects on pulse quality in a CPA system and mitigation strategies

Pulse-on-demand laser operation from nanosecond to femtosecond pulses and its application for high-speed processing

Adaptive Nonlinear Phase Compensation in a Femtosecond Hybrid Laser with Varying Pulse Repetition Rate

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