Papers by Author: Qing Pu Wang

Abstract: The mode-locking phenomenon of a passively Q-switched Raman laser with a ceramic Nd:YAG as the gain medium, an SrWO4 crystal as the Raman medium and a Cr4+:YAG crystal as the saturable absorber had been investigated. From the investigation, the author found that the study on Nd:YAG ceramic material will be helpful for the Laser Technology and Application.

Abstract: A diode-pumped actively Q-switched eye-safe intracavity Raman laser with ceramic Nd:YAG gain medium and BaWO4 Raman crystal is demonstrated for the first time. The highest average output power of 0.76 W is obtained at a pulse repetition frequency of 30 kHz and a pump power of 11.3 W. The corresponding conversion efficiency from the diode pump power to Raman output power is 6.7%. The highest pulse energy of 38.1 µJ is obtained at a pulse repetition frequency of 15 kHz and a pump power of 7.8 W, and the corresponding peak power is 4.9 kW.

Abstract: We consider a bulk silicon crystal as a Mid-IR Raman amplifier and study its Raman amplification. A Raman amplifier is established when an intense pump laser pulse and a Raman laser pulse pass through one silicon simultaneously, with good spatial and temporal overlap. Considering the situation of pumping wavelength at 2.94 μm achievable by using an Er:YAG laser and Raman laser wavelength at 3.47 μm with the 521 cm-1 Raman shift, the properties of the output amplified Raman laser are investigated by numerically solving the coupled transfer equations.

Abstract: A diode-end-pumped ceramic Nd:YAG laser discretely tunable for five wavelengths was demonstrated. The tunability was obtained by a blazing grating in Littrow mode, and the laser was discretely tuned from 1052 nm to 1073 nm. Under the diode pump power of 4.59 W, the average output powers at five wavelengths were all over 1 W. The laser source may find applications in spectroscopy and metrology.