Abstract:We present what is, to the best of our knowledge, the first pulsed deep-blue laser at 456 nm by acousto-optical Qswitching and intracavity frequency doubling of a diode-endpumped Nd:GdVO 4 laser on the 4 F 3/2 → 4 I 9/2 transition at 912 nm. When the incident pump power is 36 W, the maximum single pulse energy of 44.1 µJ, pulse duration of 140 ns and peak power of 315 W are achieved at 10 kHz; the maximum average power of 770 mW, pulse duration of 200 ns and peak power of 193 W are obtained at 20 kHz. The fluctuation of the blue output power is less than 2.4% within the given 20 min at the maximum blue output power.
Efficient continuous wave (cw) 914 nm laser operating on 4 F 3/2 → 4 I 9/2 transition in Nd:YVO4 crystal end-pumped by π-polarized 808 nm diode at room temperature is reported for the first time. The highest output power is up to 4.85 W under the incident pump power of 20.3 W. The optical-to-optical efficiency is 23.9%, and the average slope efficiency is up to 40%. The beam quality factor was measured to be M 2 = 2.27 at the output power of 4 W by the traveling knife-edge method. To our knowledge, the slope efficiency is the highest and the beam quality is the best for the 914 nm laser under the similar power level by far.
A 879 nm diode-laser end-pumped diffusion-bonding composite YVO4/Nd:GdVO4 crystal was firstly demonstrated at the emission of 1063 nm. Simulation results showed the temperature and stress intensity were lower in YVO4/Nd:GdVO4 crystal. A maximum continuous wave (CW) output power of 14.8 W was obtained, corresponding to the slope efficiency of 54.4% and optical-optical efficiency of 48.1%. Better laser performances are expected with the improvement of YVO4/Nd:GdVO4 crystal quality.
Abstract:Effective CW and A-O Q-switched laser operations were demonstrated firstly using a continuous-grown GdVO 4 /Nd:GdVO 4 composite rod. A maximum CW output power of 19.2 W was obtained with the slope efficiency of 79.6% and the maximum optical-optical efficiency of 73.0% to absorbed pump power. In A-O Q-switched operation, the pulse width of 15.0 ns, 10.6 ns, and 6.9 ns, the peak power of about 11.3 kW, 29.6 kW, and 130.4 kW were achieved at the repetition rate of 100 kHz, 50 kHz, and 10 kHz, respectively.
Higher order processes that produced visible fluorescence observed in Nd:GdVO4 laser crystals pumped by 808 nm diode-laser were studied in the spectroscopic measurements. These processes were the energy transfer upconversion and the excited state absorption. The green, orange and the red emissions can be attributed to the transitions from the 4 G 7/2 excited state, which is populated by the ETU, the UV and blue emissions can be attributed to the ESA. The upconversion spectra indicate that ETU and ESA process seem to be responsible for the observed visible luminescence.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.