The main objectives of this research theme are to generate CW and pulsed laser sources in the blue and deep-UV spectral domain.
We demonstrated the first frequency-doubled neodymium-doped fiber laser generating multi-watt CW power near 450 nm. A bow-tie resonator incorporating a LBO nonlinear crystal is integrated within a Nd-doped fiber laser emitting near 900 nm. This scheme achieves an IR to blue conversion efficiency close to 55% without any active control of the internal resonant cavity. As a result, up to 7.5 W of linearly-polarized blue power is generated.
Recently, frequency-quadrupled linearly-polarized Q-switched neodymium-doped fiber laser generating > 500 mW average power at 226 nm was demonstrated. For this purpose, an amplified Q-switched oscillator using novel large-mode-area (LMA) fibers and generating up to 24 W average power (15 kW peak power) at 905 nm was developed. Two nonlinear frequency conversion stages using a LBO crystal for SHG and a BBO crystal for FHG generate respectively up to 4.9 W average power in the deep blue at 452 nm and a maximum of 510 mW average power in the deep ultra-violet at 226 nm.
Linearly-polarized pulsed Nd-doped fiber MOPA at 905 nm and frequency conversion to deep-UV at 226 nm
K. Le Corre, T. Robin, A. Barnini, L. Kervella, P. Guitton, B. Cadier, G. Santarelli, H. Gilles, S. Girard, and M. Laroche
Opt. Express 29, 4240-4248 (2021)
doi : https://doi.org/10.1364/OE.416570
7.5 W blue light generation at 452 nm by internal frequency doubling of a continuous-wave Nd-doped fiber laser
B. Leconte, H. Gilles, T. Robin, B. Cadier, and M. Laroche
Opt. Express 26, 10000-10006 (2018)
doi : https://doi.org/10.1364/OE.26.010000
Generation of 520 mW pulsed blue light by frequency doubling of an all-fiberized 978 nm Yb-doped fiber laser source
M. Laroche, C. Bartolacci, B. Cadier, H. Gilles, S. Girard, L. Lablonde and T. Robin
Optics Letters 36 (2011) 3909-11
doi : 10.1364/OL.36.003909