Zheng Yi

A Laser-Diode-Pumped 7.36 W Continuous-Wave Nd:YVO4 Laser At 1342 nm

An efficient and high-power diode-laser single-end-pumped Nd:YVO4 laser with cw emission at 1342?nm is presented. With a crystal single-end-pumped by a fibre-coupled diode laser, an output power of 7.36?W is obtained from the laser cavity of concave-convex, corresponding to an optical-to-optical conversion efficiency of 32.8%. The laser is operated in TEM00 mode with small rms noise amplitude of 0.3%. This represents, to the best of our knowledge, the highest power obtained from a diode-laser single-end-pumped Nd:YVO4 cw laser at 1342?nm so far.

Widely and continuously tunable optical parametric generator based on MgO-doped periodically poled LiNbO3 crystal

A widely tunable quasi-phase-matched optical parametric generator pumped by a 1064 nm acousto-opticallyQ-switched diode-end-pumped Nd: YAG laser based on a MgO-doped periodically poled LiNbO3 crystal with a multigrating structure (29.2–30.4 μm) is reported. A broad continuous signal spectrum 1513–1731 nm is obtained by changing the crystal grating periods from 29.2 μ to 30.4 μ and by tuning simultaneously the crystal temperature from 60°C to 150°C. When the average pump power is 1.82 W with about 120 ns pulse duration operating at a repetition rate of 10 KHz, the maximum total output power of the PPMgLN OPG is about 323.58 mW consisting of 210 mW of 1.639 μm signal radiation and 113.58 mW of 3.02 μm idler radiation.

Supercontinuum Generation with 15-fs Pump Pulses in a Microstructured Fibre with Random Cladding and Core Distributions

A supercontinuum extending from 350xa0nm to more than 1700xa0nm is generated in microstructured fibre (MF) with randomly distributed air holes in cladding and core by using 15-fs pulses of a 790-nm laser. The maximum total power of the supercontinuum is 63xa0mW with 288xa0mW pump power from a 100× microscope objective. The wavelength and power of visible light ranging in the supercontinuum can be tuned by adjusting the input end of random the MF (to change pump incident point or incident angle). In particular, white light has been observed. The polarization states and waveguide modes of the visible light change with adjustment of the pump incident point or incident angle.