Degradation mechanism of SESAMs under intense ultrashort pulses in modelocked VECSELs

Addamane, Sadhvikas; Shima, Darryl M.; Laurain, Alexandre; Chan, Hsiu Ting; Balakrishnan, Ganesh; Moloney, Jerome V.

doi:10.1117/12.2290684

Cited by 4 publications

(2 citation statements)

References 43 publications

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“…Parameters of SESAM could be easily adopted to particular laser design by variation in the multi-layered structure of semiconducting materials. However, despite significant progress in design and manufacturing technologies [4], the resistance of semiconductor structures to laser radiation is limited, leading to SESAM degradation during the operation [5].…”

Section: A Master Oscillators For Usp Lasersmentioning

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: A Master Oscillators For Usp Lasersmentioning

confidence: 99%

Ultra-Short Pulse Lasers for Microfabrication: A Review

Račiukaitis

2021

IEEE J. Select. Topics Quantum Electron.

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“…Two-photon absorption has been shown to be a common damage mechanism in the aluminum containing layers of traditional SESAMs. 6,7 This leads to droop over time in average output power from the mode-locked laser and often degradation of the SESAM to a state where mode-locking can no longer be achieved at the damaged spot on the SESAM. The use of a wide-bandgap metal-oxide-based dielectric mirror obviates two-photon absorption in the Al(Ga)As DBR layers.…”

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confidence: 99%

Hybrid SESAMs for high-repetition rate mode-locked VECSELs

Gibson

Tsaoussis²,

Rollag³

et al. 2023

Vertical External Cavity Surface Emitting Lasers (VECSELs) XII

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A mode-locked VECSEL is reported using a novel hybrid semiconductor saturable absorber mirror (SESAM) consisting of a semiconductor absorber region bonded to a curved dielectric partial reflector. The hybrid SESAM is realized by direct bonding of the saturable absorber to a commercially available ultrafast output coupler, nominally 99.4% reflectivity and GDD of ≤ |20 fs2| with a radius of curvature of 10 cm. In a linear cavity where the curved output coupler is the hybrid SESAM, a pulse-width of 410 femtoseconds is achieved at a repetition rate of 4.2 GHz for a VECSEL operating at a wavelength of 1030 nm.

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