• Proceedings of the Optical Society of Korea Conference
• /
• 2007.02a
• /
• pp.32-33
• /
• 2007

• Proceedings of the Optical Society of Korea Conference
• /
• 2008.02a
• /
• pp.121-122
• /
• 2008

• Proceedings of the Optical Society of Korea Conference
• /
• 2006.07a
• /
• pp.15-16
• /
• 2006

• Proceedings of the Optical Society of Korea Conference
• /
• 2002.11a
• /
• pp.94-95
• /
• 2002

• Proceedings of the Optical Society of Korea Conference
• /
• 2002.11a
• /
• pp.92-93
• /
• 2002

• Korean Journal of Optics and Photonics
• /
• v.9 no.4
• /
• pp.231-235
• /
• 1998

Passively Q-switched, laser diode(LD) end-pumped Nd:YAG laser was demonstrated by using $Cr^{4+}$:YAG as a saturable absorber. In addition , we could calculate an excitation efficiency, which is an important parameter to evaluate the pumping geometry, directly by measuring the absorbed power in Nd:YAG at threshold condition. We found that output parameters such as average power, pulse duration, and repetition rate strongly depended on the low intensity transmission of $Cr^{4+}$:YAG and driving current of lase diode. The maximum Q-switched output power of 1 W was obtained with 40 kHz repetition rate. The pulse duration was varied from 50 ns to 200 ns.

• Korean Journal of Optics and Photonics
• /
• v.18 no.4
• /
• pp.270-273
• /
• 2007

We have investigated the output characteristics of the 946 nm Nd:YAG laser which is longitudinally pumped by a fiber coupled laser diode. The temperature of a Nd:YAG crystal mount was kept constant by a controller with thermoelectric cooler. As a result, we measured more intense output at a low temperature, and then the maximum output power was measured to be 870 mW when the pumping power and the temperature were 9.95 W and $5^{\circ}C$, respectively. It appeared that output was decreased above 10 W pump power because of the thermal effects in gain medium.

• Korean Journal of Optics and Photonics
• /
• v.20 no.5
• /
• pp.276-280
• /
• 2009

A Cr:YAG crystal was used as a saturable absorber for passive Q-switching of a Nd:$YVO_4$ laser which was pumped by a 1-W continuous wave laser diode. The first surface of the Cr:YAG was high-reflection coated for the pump wavelength. The high-reflection coating improved the absorption efficiency of the pump beam in the Nd:$YVO_4$ through double pass absorption. It also prevented pump beam induced partial bleaching of the Cr:YAG. The peak-to-peak pulse fluctuation of passively Q-switched laser output was approximately 4 %. The minimum pulse-width was measured to be 7.11 ns. Also, the average pulse repetition rate was 9 kHz and the maximum output power was 16.27 mW.

• Proceedings of the Korean Nuclear Society Conference
• /
• 2004.10a
• /
• pp.695-696
• /
• 2004

• Proceedings of the Optical Society of Korea Conference
• /
• 2009.10a
• /
• pp.251-252
• /
• 2009