In this paper, a high slope efficiency, low threshold, Single-Longitudinal Mode (SLM) Q-switched Nd:YVO4 laser emitting at 1064 nm was demonstrated. Using a Reflecting Bragg Grating (RBG) as the output coupler for mode selection, stable SLM operation with maximum output power of 1.01 W at 1 kHz repetition rate was achieved. The linewidth was less than 4 pm, and the pulse duration was around 3.2 ns. The optical-to-optical conversion efficiency was 17.1% and slope efficiency was up to 24.4%, and the laser beam quality factors M2 were 1.21 and 1.13 for horizontal and vertical directions, respectively.
An actively Q-switched 452 nm blue pulse laser based on intracavity frequency-doubled quasi-three-level Nd:LiYF4 crystal was presented. The fundamental wave resonator of the laser adopted L-shape design, pumped by 806 nm fiber-coupled laser diode, and realized pulse output by Q-switching operation at a repetition frequency of 100 Hz, in which an a-cut Nd:LiYF4 used as the gain medium. The maximum output laser average power of 7.18 mW at 452 nm was achieved by inserting a LiB3O5 crystal into the cavity for frequency doubling, and the pulse duration of the blue pulse laser was 84 ns. This compact blue pulse laser has a great prospect in the application of ocean laser detection and information transmission.
A diode-pumped nanosecond Master Oscillator Power Amplifier (MOPA) system based on Nd:YLF crystal slabs has been demonstrated. The seed pulses with pulse duration of 11 ns were generated in an EO Q-switched Nd:YLF laser, with single pulse energy of 10 mJ. The 1047 nm signal pulses were amplified in a double-pass amplification system. Maximum output pulse energy of 270 mJ at a repetition rate of 50 Hz has been achieved with effective optical-to-optical efficiency of 14.5%.
A compact diode side-pumped conductively cooled 1047 nm Nd:YLF slab laser with high energy and short pulse width is developed. Through ray tracing method, we design a home-made pump module to homogenize the pump intensity. Based on the Possion equation, a thermal conduct model of side-pump laser is established. The temperature distribution in laser crystal is obtained, and the thermal lens is caculated. With the absorbed pump energy of 818 mJ, the maximum output energy of 228 mJ is achieved in free-running mode. At a repetition rate of 50 Hz, 160 mJ, 9 ns 1047 nm infrared light is obtained under the maximum absorbed pump energy, and the slope efficiency is 27.8%.
Optical information processing research group at Shanghai Institute of Optics and Fine Mechanics (SIOFM) was engaged in recent years in the research on nonlinear properties of photorefractive crystals and their applications in optical information processing and has achieved some results in this field. We report in this paper a few major results which are esteemed rather important in our opinion. They are some new results of beam coupling in SBN:Ce crystals, and some new methods of spatial light modulation, associative holographic memory and spatial filtering.
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