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Proceedings Paper

1.44-µm giant pulse generation
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Paper 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.

Paper Details

Date Published: 9 March 2007
PDF: 10 pages
Proc. SPIE 6451, Solid State Lasers XVI: Technology and Devices, 64511H (9 March 2007); doi: 10.1117/12.717104
Show Author Affiliations
Jan Šulc, Czech Technical Univ. Prague (Czech Republic)
Pavel Arátor, Czech Technical Univ. Prague (Czech Republic)
Helena Jelínková, Czech Technical Univ. Prague (Czech Republic)
Karel Nejezchleb, Crytur, Ltd. (Czech Republic)
Václav Škoda, Crytur, Ltd. (Czech Republic)

Published in SPIE Proceedings Vol. 6451:
Solid State Lasers XVI: Technology and Devices
Hanna J. Hoffman; Ramesh K. Shori; Norman Hodgson, Editor(s)

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