1.44-µm giant pulse generation

Jan Šulc; Pavel Arátor; Helena Jelínková; Karel Nejezchleb; Václav Škoda

doi:10.1117/12.717104

9 March 2007 1.44-&mgr;m giant pulse generation

Jan Šulc, Pavel Arátor, Helena Jelínková, Karel Nejezchleb, Václav Škoda

Proceedings Volume 6451, Solid State Lasers XVI: Technology and Devices; 64511H (2007) https://doi.org/10.1117/12.717104
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

We have compared two solid-state saturable absorbers for Q-switching of longitudinally diode-pumped Nd:YAG laser operating at wavelength 1444 nm: vanadium doped garnet (V³⁺:Y₃Al₂O₅, V:YAG), and cobalt doped spinel (Co²⁺:MgAl₂O₄, Co:MALO). V:YAG crystal with initial transmission 91% was 2.2mm thick. Co:MALO crystal with initial transmission 91% was 2.0mm thick. Q-switched laser consisted of the Nd:YAG composite rod (8mm long Nd-doped part, 4mm long undoped YAG part) and the saturable absorber placed in 80mm long hemispheric cavity. As an output coupler was used concave mirror (r = 150mm) with reflectivity 98% on lasing wavelength. Giant pulses were obtained with both passive Q-switches. When V:YAG saturable absorber was used, 55 ns long (FWHM) pulses were generated with peak power 0.47kW (pulse energy 26 &mgr;J). Using Co:MALO, more powerful pulses were obtained (40 ns long, 1.0kW peak power, 45 &mgr;J energy). Advantage of less efficient V:YAG consist in possibility of diffusion bonding between Q-switch and laser active medium which allows to prepare miniature compact laser device. This concept was demonstrated by using of Nd:YAG/V:YAG monolith crystal (4mm long undoped YAG part, 8mm long Nd:YAG part, 0.5mm long V:YAG part - initial transmission 97% @ 1444 nm). This monolithic crystal, originally designed for 1338nm lasing, was placed into 23mm long cavity resonating at wavelength 1444 nm. For output coupler reflectivity 96% pulses 39 ns long with peak power 0.64kW were generated at wavelength 1444 nm.

Citation Download Citation

Jan Šulc, Pavel Arátor, Helena Jelínková, Karel Nejezchleb, and Václav Škoda "1.44-&mgr;m giant pulse generation", Proc. SPIE 6451, Solid State Lasers XVI: Technology and Devices, 64511H (9 March 2007); https://doi.org/10.1117/12.717104

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