Multi-GHz repetition rate, femtosecond deep ultraviolet source in burst mode derived from an electro-optic comb

Ye, Hanyu; Pontagnier, Lilia; Dixneuf, Clément; Santarelli, Giorgio; Cormier, Éric

doi:10.1364/oe.409782

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…The GHz intra-burst repetition rate in UV spectral range was achieved based on the fourth-harmonic generation of an electrooptic comb operating in a burst mode which permits flexible repetition rate at the GHz level [40]. An ultra-short pulse laser combined with an external array of birefringent crystals was applied to generate near-THz bursts of single-picosecond pulses at variable delays between consecutive pulses [41].…”

Section: Ghz Laser Sources For Materials Processingmentioning

confidence: 99%

Ultra-Short Pulse Lasers for Microfabrication: A Review

Račiukaitis

2021

IEEE J. Select. Topics Quantum Electron.

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Ultra-short pulse lasers, generating coherent light pulses with pulse durations in the picosecond and femtosecond range, are becoming popular in precision laser microfabrication. They are benefiting not only from well-predicted laser ablation with the suppressed heat-affected zone but also by opening new processing opportunities, especially in transparent materials, due to enhanced non-linear interaction with the material. In this review, the evolution of various kinds of mode-locked lasers from a scientific toy to a robust industrial tool is reviewed. The utilization benefits of high-average-power, high-pulse-repetition-rate ultra-short pulse laser are closely related to beam shaping and manipulation techniques. Fast beam scanning with galvanometric and polygon scanners as well as multi-beam parallel processing methods were developed. Some hot applications areas are briefly described. The efficient use of photons from ultra-short pulse lasers pushed the development of optimization methods in the ablation process. Efforts toward upscaling the process by increasing the average power of mode-locked lasers made feedback to laser developers, and burst regime became a necessity as well as high-speed beam scanning devices. Unique opportunities of ultra-short pulses are successfully exploited in machining transparent materials, with glass separation being the leading application.

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Section: Ghz Laser Sources For Materials Processingmentioning

confidence: 99%

Ultra-Short Pulse Lasers for Microfabrication: A Review

Račiukaitis

2021

IEEE J. Select. Topics Quantum Electron.

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“…Burst-mode two-photon polymerization was considered to deliver microstructures with smaller feature size 18 , while irradiation of solid targets with femtosecond pulse bursts was demonstrated to significantly increase of the hard X-ray yield 19 . For what concerns laser wavelength conversion processes, generation second and fourth harmonics with femtosecond pulse bursts was demonstrated 20 . Burst-mode pumping was shown beneficial for increasing the pump-to-idler conversion efficiency in long-picosecond mid-infrared optical parametric oscillator 21 .…”

Section: Introductionmentioning

confidence: 99%

Supercontinuum generation in bulk solid-state material with bursts of femtosecond laser pulses

Momgaudis,

Marčiulionytė,

Jukna

et al. 2024

Sci Rep

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We report on experimental and numerical investigation of burst-mode supercontinuum generation in sapphire crystal. The experiments were performed using bursts consisting of two 190 fs, 1030 nm pulses with intra-burst repetition rates of 62.5 MHz and 2.5 GHz from an amplified 1 MHz Yb:KGW laser and revealed higher filamentation and supercontinuum generation threshold for the second pulse in the burst, which increases with the increase of intra-burst repetition rate. The experimental results were quantitatively reproduced numerically, using a developed model, which accounted for altered material response due to residual excitations remaining after propagation of the first pulse. The simulation results unveiled that residual free electron plasma and self-trapped excitons contribute to elevated densities of free electron plasma generated by the second pulse in the burst and so stronger plasma defocusing, significantly affecting its nonlinear propagation dynamics. The presented results identify the fundamental and practical issues for supercontinuum generation in solid-state materials using femtosecond pulse bursts with very high intra-burst repetition rates, which may also apply to the case of single pulses at very high repetition rate, where residual material excitations become relevant and should be accounted for.

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“…These power levels are required to further extend the domain of applications of HRR lasers and efficiently convert the central wavelength of the pulses into the ultraviolet (UV), visible, or infrared (IR) spectral ranges. Extension in the visible and UV spectral range is usually performed through second-harmonic generation (SHG) and sum-frequency generation (SFG) [17]. Further extension in the IR can be achieved through pumping an optical parametric oscillator (OPO) by amplifying the output of an HRR laser system [18,19].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond OPO pumped by a high power ytterbium rod-type fiber laser mode locked at harmonic repetition rates

Freysz

2022

Optics & Laser Technology

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We report on an optical parametric oscillator (OPO) pumped by femtosecond pulses delivered by a large-mode-area, ytterbium-doped, rod-type fiber laser. This femtosecond laser that is mode locked at harmonic repetition rates of 108 MHz, 216 MHz, and 324 MHz provides an average output power of more than 4.5 W and tens of nJ per pulse. The repetition rate is changed by adjusting the pulse polarization inside the laser cavity. Remarkably, at all these repetition rates and without any modification to the cavity, the OPO delivers femtosecond signal pulses that are tunable from 1450 nm to 1700 nm, with an average output power higher than 1 W. Increasing the pump power of the rod-type fiber and decreasing the transmission of the OPO output coupler, we were able to run the OPO at 540 MHz.

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Multi-GHz repetition rate, femtosecond deep ultraviolet source in burst mode derived from an electro-optic comb

Cited by 12 publications

References 25 publications

Ultra-Short Pulse Lasers for Microfabrication: A Review

Ultra-Short Pulse Lasers for Microfabrication: A Review

Supercontinuum generation in bulk solid-state material with bursts of femtosecond laser pulses

Femtosecond OPO pumped by a high power ytterbium rod-type fiber laser mode locked at harmonic repetition rates

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