Diode-pumped actively Q-switched Nd:GGG laser operating at 938nm (original) (raw)

Efficient diode-pumped Nd:GGG laser operation at 933.6 and 937.3 nm

Applied Physics B, 2012

CW laser emission on the quasi 3-level ( 4 F 3/2 → 4 I 9/2 ) transition in Nd:GGG is reported for different pump focusing and resonator dimensions. A nearly hemispherical plano-concave resonator led at 937.3 nm to a maximum output power of 4.1 W for an incident pump power of 21.7 W, thus corresponding to a slope efficiency of about 23.5%. Laser operation was also obtained for the first time around 933.6 nm by using a glass etalon for frequency selection with a maximum output power of 2.3 W and a slope efficiency of 16% with respect to the incident pump power. Dual-wavelength operation (around 933.6 and 937.3 nm), which offers a potential source to generate THz radiation, is also reported. B. Xu · P. Camy ( ) · J.L. Doualan · A. Braud · R. Moncorgé Centre de Recherche sur les Ions, les Matériaux et la Photonique

Diode-pumped cw and Q-switched Nd:GdVO4 laser operating at 1.34 μm

2003

A diode-pumped 1.34 lm Nd:GdVO 4 laser operating in cw and active Q-switching modes has been demonstrated. 4.15 W of cw output power was obtained at the highest attainable pump power of 12.3 W, resulting in an optical conversion efficiency of 33.7%, the slope efficiency was determined to be 37.6%. In Q-switching operation, a maximum average output power of 2.7 W was generated at pulse repetition frequency (PRF) of 50 kHz, with an optical conversion efficiency of 22% and a slope efficiency of 29.2%. The laser pulses with shortest duration, highest energy and peak power were achieved at PRF of 10 kHz, the parameters being 15 ns, 160 lJ, and 10.7 kW, respectively. By intracavity frequency-doubling with a type II phased-matched KTP crystal, 0.62 W average power at 0.67 lm was produced at a PRF of 15 kHz, the resulting pulse energy, peak power, and pulse width being 41.3 lJ, 2.2 kW, and 19 ns, respectively. A group of analytical formulae, based on rate equations, are presented to evaluate the operational parameters of an actively Q-switched laser. Calculated results were found to be in close consistency with the experimental data.

Passive Q Switching of a Diode-Pumped 946-nm Nd:YAG Laser with 1.6-W Average Output Power

Applied Optics, 1998

As much as 1.6-W average output power was emitted in a simple setup from a diffusion-bonded Nd:YAG rod with 70 -100-ns Q-switched pulses at 946 nm and repetition frequencies between 15 and 45 kHz at 22-W incident diode-pump power. A Cr 4ϩ :YAG crystal with a bleachable loss of approximately 2.5% and a length of 0.5 mm was used as a saturable absorber. The extraction efficiency was 47% in comparison with the continuous-wave laser output power of 3.37 W in the free-running regime.

High-power diode-pumped actively Q-switched Nd:YAG laser at 1123 nm

Optics Communications, 2004

A high-power diode-pumped Nd:YAG laser at 1123 nm is acousto-optically Q-switched at a pulse repetition rate range of 5-20 kHz. Experimental results reveal that the resonator mirrors need to suppress parasitic oscillations on lines in the 1064 nm as well as 1319 nm regions for actively Q-switching operation. With an incident pump power of 19.2 W, the pulse energy increases from 0.15 mJ at 20 kHz to 0.4 mJ at 5 kHz. The highest peak power is up to 8.0 kW at 5 kHz. Furthermore, a conventional model of coupled rate equations is used to analyze the experimental data. The general agreement indicates that the simple model is adequate for a first order prediction of the low-gain laser characteristics.

Diode pumped Nd:GSAG and Nd:YGG laser at 942 and 935nm

Optics Communications, 2007

Two new Nd 3+ doped crystals show laser activity between the 4 F 3/2 and 4 I 9/2 levels. Diode pumped emission of Nd:GSAG at 942 nm wavelength with 950 mW output power and 14% optical to optical efficiency as well as laser emission of Nd:YGG at 935 nm with 700 mW output power and 11% efficiency have been obtained. These wavelengths are useful for water vapour absorption measurements.

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

Applied Physics B, 2008

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 Cr 4+ :YAG crystal. Experimental results reveal that the saturable absorber of InGaAs QWs is superior to the Cr 4+ :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.

High-peak-power passively Q-switched 1.3 \mu m Nd:YAG/V3+:YAG laser pumped by a pulsed laser diode

Chinese Optics Letters, 2015

We demonstrate a high-pulse-energy, short-pulse-width passively Q-switched (PQS) Nd:YAG∕V 3þ :YAG laser at 1.3 μm, which is end-pumped by a pulsed laser diode. During the PQS regime, a maximum total output pulse energy of 3.3 mJ is obtained under an absorbed pump pulse energy of 21.9 mJ. Up to 400 μJ single-pulse energy is realized with the shortest pulse width of 6.16 ns and a pulse repetition frequency of 34.1 kHz, corresponding to a peak power of 64.9 kW. The high-energy laser pulse is operated in the dual wavelengths of 1319 and 1338 nm, which is a potential laser source for THz generation.

Short pulse, high peak power, diode pumped, passively Q-switched 946 nm Nd:YAG laser

Optics Communications, 2007

We report on generation of 946 nm laser pulses of a few nanosecond duration and up to 3.7 kW peak power from a compact diodepumped passively Q-switched Nd:YAG laser. This power is 2.5 times as much as what previously has been obtained from this type of a laser. The short pulses with the record high peak power may be particularly attractive for laser range finding type applications.