Linearly-polarized pulsed Nd-doped fiber MOPA at 905 nm and frequency conversion to deep-UV at 226 nm

Kilian Le Corre , Thierry Robin (1) , Alexandre Barnini (1) , Louanne Kervella , Pascal Guitton , Benoit Cadier (1) , Giorgio Santarelli (2) , Hervé Gilles (3) , Sylvain Girard (4) , Mathieu Laroche (3)

1 iXBlue Photonics
2 LP2N - Laboratoire Photonique, Numérique et Nanosciences
3 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
4 LHC - Laboratoire Hubert Curien

We present the first frequency-quadrupled linearly-polarized Q-switched neodymium-doped fiber laser generating > 500 mW average power at 226 nm. 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 (DUV) at 226 nm. Performance limitations and further improvements are discussed.

Domaines: Physique [physics]; Sciences de l'ingénieur [physics]

Kilian Le Corre, Thierry Robin, Alexandre Barnini, Louanne Kervella, Pascal Guitton, et al.. Linearly-polarized pulsed Nd-doped fiber MOPA at 905 nm and frequency conversion to deep-UV at 226 nm. Optics Express, 2021, 29 (3), pp.4240. ⟨10.1364/OE.416570⟩. ⟨hal-03221103⟩