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Optical Engineering

Application of V3+:YAG crystals for Q-switching and mode-locking of 1.3-um diode-pumped neodymium lasers
Author(s): Jan Karol Jabczynski; Krzysztof Kopczynski; Zygmunt Mierczyk; Antoniangelo Agnesi; Annalisa Guandalini; Giancarlo C. Reali
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Paper Abstract

High-power passive Q-switching and mode-locking operation regimes of diode end-pumped Nd:YAG, Nd:YVO4, and Nd:YAP active media, operating at a 1.34-?m wavelength are investigated with V3+:YAG crystal as the saturable absorber. The highest average power of 2.1 W results from a Nd:YVO4 crystal placed in a 70-mm-long linear cavity. The corresponding pulse peak power and width are 0.1 kW and 133 ns, respectively. Employing a Nd:YAP crystal and 35-mm cavity length, the highest peak power of ~2.8 kW results when the laser runs at a 6.5-kHz repetition rate for an average power of —0.4 W. A record of 79-xJ pulse energy results from a 64-mm-long resonator with Nd:YAG gain media, however, for a decreased average power of ~0.24 W and pulses of 40-ns width. The mode-locking operation regime is investigated in a Z-type cavity. The best results, namely, ~0.5 W average power with mode-locked envelope energy in excess of 30 ?J and mode- locked pulse energy of 0.7 ?J, are obtained from the Nd:YVO4 media. Trains of 1-?s-wide pulses with improved stability result from a 1.5-m- long designed cavity with KTP crystal applied for passive negative feedback. A numerical modeling that takes into account the short recovery time of V3+:YAG saturable absorber (~5 ns) and excited state absorption effect is used to analyze and obtain general rules for optimizing such lasers.

Paper Details

Date Published: 1 December 2001
PDF: 10 pages
Opt. Eng. 40(12) doi: 10.1117/1.1418716
Published in: Optical Engineering Volume 40, Issue 12
Show Author Affiliations
Jan Karol Jabczynski, Military Univ. of Technology (Poland)
Krzysztof Kopczynski, Military Univ. of Technology (Poland)
Zygmunt Mierczyk, Military Univ. of Technology (Poland)
Antoniangelo Agnesi, Univ. di Pavia (Italy)
Annalisa Guandalini, Univ. di Pavia (Italy)
Giancarlo C. Reali, Univ. di Pavia (Italy)

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