39.1 μJ picosecond ultraviolet pulses at 355 nm with 1 MHz repeat rate.

Based on our reliable high-power picosecond laser source with high beam qualities, we designed a compact and efficient third harmonic generation scheme by cascading a frequency doubling and a sum frequency generation using LBO as the nonlinear material. A maximum output of 39.1 W with a repeat rate of 1 MHz at 355 nm was obtained, which implied a pulse energy of 39.1 μJ, which was the highest picosecond UV pulse energy with an all-solid-state setup so far. The total conversion efficiency from infrared to UV was up to 46%. And the output UV has excellent beam qualities with an M-square factor less than 1.1.

[1]  T. Kojima,et al.  High-brightness 138-W green laser based on an intracavity-frequency-doubled diode-side-pumped Q-switched Nd:YAG laser. , 2000, Optics letters.

[2]  Norman Hodgson,et al.  High-power Q-switched TEM00 mode diode-pumped solid state lasers with > 30W output power at 355nm , 2006, SPIE LASE.

[3]  N. Chen,et al.  Highly efficient ultraviolet generation at 355 nm in LiB(3)O(5). , 1989, Optics letters.

[4]  Dyson,et al.  Efficient extreme UV harmonics generated from picosecond laser pulse interactions with solid targets. , 1996, Physical review letters.

[5]  Dominique Coquillat,et al.  Enhanced second- and third-harmonic generation and induced photoluminescence in a two-dimensional GaN photonic crystal , 2005 .

[6]  Benxin Wu,et al.  Physical mechanisms for picosecond laser ablation of silicon carbide at infrared and ultraviolet wavelengths , 2010 .

[7]  D. Neely,et al.  Surface transport of energetic electrons in intense picosecond laser-foil interactions , 2011 .

[8]  R. Wallenstein,et al.  Harmonic and sum-frequency generation of pulsed laser radiation in BBO, LBO, and KD*P , 1991 .

[9]  Shaojun Fu,et al.  Diode end-pumped high-power Q-switched double Nd:YAG slab laser and its efficient near-field second-harmonic generation. , 2008, Optics letters.

[10]  Triggering and guiding electric discharge by a train of UV picosecond pulses combined with a long UV pulse , 2012, 1201.4027.

[11]  François Salin,et al.  High power picosecond fiber laser emitting 50 W at 343 nm at 80 MHz , 2012, Other Conferences.

[12]  B. Chichkov,et al.  Ultrashort picosecond laser processing of micro-molds for fabricating plastic parts with superhydrophobic surfaces , 2012 .

[13]  Zhe Ma,et al.  Compact multipass Nd:YVO 4 slab laser amplifier based on a hybrid resonator , 2007 .

[14]  R L Byer,et al.  6.5-W, 532-nm radiation by cw resonant external-cavity second-harmonic generation of an 18-W Nd:YAG laser in LiB(3)O(5). , 1991, Optics letters.

[15]  Keming Du,et al.  Highly efficient third-harmonic generation with electro-optically Q-switched diode-end-pumped Nd:YVO4 slab laser , 2007 .

[16]  N. Morita,et al.  Generation of picosecond UV pulses by stimulated anti-Stokes Raman scattering , 1983 .

[17]  Andrzej Majchrowski,et al.  Efficient third harmonic generation of microjoule picosecond pulses at 355nm in BiB3O6 , 2006 .