High energy 40 fs compact diode-pumped femtosecond laser for nanostructuring applications

Clemens Hönninger; Ramatou Bello Doua; Eric P. Mottay; François Salin

doi:10.1117/12.643824

28 February 2006 High energy 40 fs compact diode-pumped femtosecond laser for nanostructuring applications

Clemens Hönninger, Ramatou Bello Doua, Eric P. Mottay, François Salin

Proceedings Volume 6100, Solid State Lasers XV: Technology and Devices; 61000I (2006) https://doi.org/10.1117/12.643824
Event: Lasers and Applications in Science and Engineering, 2006, San Jose, California, United States

Abstract

High peak power femtosecond oscillators exhibit great potential for many applications such as micro- and nanomachining and structuring, waveguide writing in glass, nonlinear frequency conversion or seeding of ultrafast fiber and bulk amplifiers. Ultrashort pulse durations below 50 fs are routinely produced by Ti:sapphire lasers. However, due to the need for a green pump laser, Ti:Sapphire lasers suffer from a greater complexity. Diode-pumped Ytterbium femtosecond lasers on the other hand are compact and reliable lasers, but, because of the limited amplification bandwidth, typically exhibit pulse duration greater than 60 fs. We present a directly diode-pumped 40-fs laser source with pulse energies higher than 120 nJ, more than 2 MW peak power, and a pulse repetition rate of 9 MHz. The laser setup is compact and fits in a 60 x 40 cm footprint. The laser source consists of a passively mode-locked femtosecond oscillator and fiber-based post-compression module. The oscillator operates at 9 MHz pulse repetition rate and produces pulse energies up to 300 nJ at 370 fs pulse duration. The oscillator is then focused into a standard single mode fiber in order to broaden the pulse spectrum to about 60 nm bandwidth. Owing to the high initial pulse energy the used fiber is as short as 15 mm. After collimation it was sufficient to reflect the beam 8 times on 2 parallel chirped mirrors having 250 fs² each. The overall transmission of this pulse compression module was about 80% resulting in 120 nJ transmitted pulse energy in 40-fs pulses.

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Clemens Hönninger, Ramatou Bello Doua, Eric P. Mottay, and François Salin "High energy 40 fs compact diode-pumped femtosecond laser for nanostructuring applications", Proc. SPIE 6100, Solid State Lasers XV: Technology and Devices, 61000I (28 February 2006); https://doi.org/10.1117/12.643824

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KEYWORDS

Femtosecond phenomena

Oscillators

Pulsed laser operation

Diodes

Laser crystals

Mode locking

Mirrors

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