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Optimization of a passively Q-switched Nd:YAG laser with a saturable absorber characterized by excited state absorption (ESA

Świderski J.

Optica Applicata

2004

Vol. 34, nr 2

275-289

Mathematical description of a passively Q-switched laser and the way it works are presented. Both theoretical and experimental model of this laser have been worked out. Moreover, numerical analysis of saturable absorber influence on laser efficiency was made. It is the saturable absorber characterized by excited state absorption (ESA) that has been taken into account. The optimization procedure points to the optimal circumstances of the laser system considered. The results obtained numerically are in very good agreement with those achieved experimentally

Investigation on passively Q-switched Nd:YAG slab laser pumped by 2D quasi cw diode laser stack

Żendzian W., Jabczyński J.K., Mierczyk Z.

Opto-Electronics Review

2001

Vol. 9, No. 1

75-81

The paper presents results of investigations on generation of Nd:YAG triangle slab laser pumped by 2D diode array. The pump beam shape quality with respect to pump/mode overlap efficiency was investigated both theoretically and experimentally. Two cavity schemes with and without pump forming optics were verified in free running and passively Q-switching modes. Slope efficiency of 45% and output energy of 24 mJ for incident 60 mJ of pump energy were achieved in free running mode. Applying Cr⁴⁺:YAG crystal as passive Q-switch, the output energy of 5 mJ and 0.5 MW peak power were obtained in the optimised resonator.

High repetition rate, V³⁺:YAG crystal Q-switched diode pumped Nd lasers

Jabczyński J. K., Mierczyk Z., Żendzian W., Kopczyński K., Frukacz Z.

Opto-Electronics Review

2001

Vol. 9, No. 1

57-66

The high repetition rate passively Q-switched neodymium host lasers operating at 1 mm wavelenght pumped by a 10-W fibre-coupled diode laser are presented. As a passive q-switch the V³⁺:YAG crystal was applied. The V³⁺:YAG parameters were determined in spectroscopic and saturable transmission experiments. A numerical model taking into account short recovery time of V³⁺:YAG ~ 5 ns and excited state absorption was used to analyse such a laser. The thermal lensing magnitude and performance were determined in free running experiments for two Nd:YAG rods of different quality and Nd:YLF crystal. The smooth Q-switched pulses with repetition rates of 40-200 kHz were abtained in short linear cavities of a length less than 11cm. The highest average power of 1.4 W with slope efficiency of 20% was demonstrated in Nd:YAG laser. Long pulse durations of hundreds ns and low pulse energy of a few mJ (up to 24 in the best case) were caused by low value of the ratio of the absorption cross section of V³⁺:YAG to emission cross section of Nd:YAG. The much higher pulse energy of 70 µJ with pulse duration of 80 ns was abtained in lower gain Nd:YLF laser in a cavity of 140 mm length with internal lens 50 mm focal length.