Generation of UV radiation at 335.5 nm based on frequency-quadrupling of a diode-pumped Nd:YVO_4 laser

The generation of ultraviolet(UV)light at 335.5 nm based on frequency quadrupling of a diode-end- pumped Q-switched Nd:YVO_4 laser at 1342 nm was demonstrated.KTP crystal was used for generation of wavelength of 671 nm by intracavity doubling and LBO(BBO)crystal was exploited for the subsequent external fourth harmonic generation(FHG).With 6.3-W absorbed pump power and 10-kHz frequency repetition rate,the UV output power of 35 and 63 mW were obtained by using LBO and BBO as frequency quadrupling nonlinear crystals,respectively.The experimental results show that the conversion efficiency (red-UV)of 6.4% for BBO crystal is higher than that of 3.5% for LBO crystal,but the UV beam quality obtained by LBO crystal is better than by BBO crystal.     

High power Nd:YAG slab laser sidepumped by diode laser array

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High-peak-power passively Q-switched Nd:YAG laser at 946 nm

We demonstrate a high-peak-power quasi-continuous-wave diode-pumped passive Q-switched Nd:YAG laser at 946 nm. We make a thorough comparison of the output performance between the saturable absorbers of InGaAs quantum wells (QWs) and a Cr⁴⁺:YAG crystal. Experimental results reveal that the saturable absorber of InGaAs QWs is superior to the Cr⁴⁺:YAG crystal because of the low nonsaturable losses and leads to a pulse energy of 330 μJ with a peak power greater than 11 kW.     

Diode-pumped passively Q-switched Nd : YAG laser at 1123 nm

A diode-pumped Nd:YAG laser at 1123 nm is passively Q-switched by using a low doping concentration Cr⁴⁺:YAG crystal as a saturable absorber. When pumped by a 1.5-W laser diode, the laser produces pulses of 50-ns duration with a pulse energy of as much as 15 J and a peak power of 300 W at a pulse-repetition rate of 10 kHz. PACS 42.60.Gd; 42.55.Rz; 42.55.Xi     

Study on CW Nd:YAG infrared laser at 1319 nm

A continuous wave (CW) Nd:YAG infrared laser at 1319 nm is reported in this paper. The energy level of 1319-nm wave was analyzed. The repression of 1064-nm lasing and enhancement of 1319-nm output power were discussed. Mirror coating and cavity structure were studied and a maximum CW output power of 43 W at 1319 nm was achieved in experiments.     

High-energy directly diode-pumped Q-switched 1617 nm Er:YAG laser at room temperature

We describe high-energy Erbium-doped yttrium aluminum garnet (Er:YAG) lasers operating at 1617?nm, resonantly pumped using 1532?nm fiber-coupled laser diodes. A maximum continuous wave output power of 4.3?W at 1617?nm was achieved with an output coupler of 20% transmission under incident pump power of 29.7?W, resulting in an optical conversion of 14% with respect to the incident pump power. In Q-switched operation, the pulse energy of 11.8?mJ at 100?Hz pulse repetition frequency and 81?ns pulse duration was obtained. This energy is the highest pulse energy reported for a directly diode-pumped Q-switched Er:YAG laser operating at 1617?nm.     

Nd:GSAG-pulsed laser operation at 943 nm and crystal growth

Laser activity of neodymium-doped gadolinium scandium aluminum garnet (Nd:GSAG) on the transition with an output wavelength around 943 nm was investigated. The emission cross-section was measured with spectroscopic and amplifier approaches demonstrating the applicability of the Nd:GSAG laser for water vapor detection. A Q-switched laser setup delivered 150 ns pulses with 26 mJ output energy and 9% optical to optical efficiency. The laser was diode pumped with up to 50 Hz repetition rate. In the long pulse mode a pulse energy of 83 mJ with 32% optical efficiency was achieved. The output wavelength was controlled by injection seeding. PACS 42.55.Xi; 42.70.Hj     

QCW diode-side-pumped Nd:YAG ceramic laser with 247 W output power at 1123 nm

We demonstrate for the first time a diode-side-pumped quasi-continuous-wave (QCW) operation of a 1123 nm Nd:YAG ceramic laser. The single 1123 nm wavelength is acquired through precise coating. With a pump power of 1000 W, an output power of 247 W is obtained, corresponding to an optical–optical conversion efficiency of 24.7%. At the maximal output power, the pulse repetition rate and pulse width are measured to be 1.1 kHz and 180 μs, respectively. The numerical simulations for wavelength selectivity from 1112, 1116 and 1123 nm are discussed in detail.