Hengli Zhang

High beam quality and compact diode end-pumped Nd:YVO4 slab laser with a hybrid resonator

A compact, high power and high beam quality diode-end-pumped CW Nd:YVO4 slab 1064 nm laser with a hybrid resonator is demonstrated. The maximum output power of 23.0 W is obtained under the pump power of 66.7 W, which gives the slope efficiency and optical conversion efficiency of 52.0 and 34.0%, respectively. The beam quality M2 factors are measured to be 1.5 in the unstable direction and 1.7 in the stable direction. The power stability of the LD end-pumped slab laser at an output power of 19 W is measured to be 0.7% for half an hour operation.

Near-diffraction-limited, 35.4 W laser-diode end-pumped Nd:YVO4 slab laser operating at 1342 nm

A diode stack end-pumped Nd:YVO4 slab laser at 1342 nm with near-diffraction-limited beam quality by using a hybrid resonator was presented. At a pump power of 139.5 W, laser power of 35.4 W was obtained with a conversion efficiency of 25.4% of the laser diode to laser output. The beam quality M2 factors were measured to be 1.2 in the unstable direction and 1.3 in the stable direction at the output power of 29 W.

A laser-diode-pumped acoustic-optic Q-switched Nd:YVO4 slab laser with a hybrid resonator

A 32.1 W laser-diode-stack pumped acoustic-optic Q-switched Nd:YVO4 slab laser with hybrid resonator at 1064 nm was demonstrated with the pumping power of 112 W and repetition rate of 40 kHz, the pulse duration was 32.47 ns. The slope efficiency and optical-to-optical efficiency were 37 and 28.7%, respectively. At the repetition rate of 20 kHz and pumping power of 90 W, the average output power and pulse duration were 20.4 W and 20.43 ns, respectively. With the pumping power of 112 W, the beam quality M2 factors in CW operation were measured to be 1.3 in stable direction and 1.6 in unstable direction.

880 nm laser-diode end-pumped Nd:YVO4 slab laser at 1342 nm

Abstract43.6 W near-diffraction-limited continuous-wave laser beam at 1342 nm in 880 nm laser-diode partially end-pumped Nd:YVO4 slab laser is presented. The slope efficiency and optical-to-optical efficiency with respect to absorbed pumping power were 45.4% and 35.9%, respectively. At output power of 34.5 W, the M2 factors in unstable and stable directions were 1.3 and 1.2, respectively.

A high beam quality laser-diode end-pumped Nd:GdVO4 slab laser

An 83 W, near-diffraction-limited LD end-pumped Nd:GdVO4 slab laser with hybrid resonator was presented with the pumping power of 238 W, the slope efficiency and optical-to-optical conversion efficiency were 39.4 and 34.9%, respectively. At the output power of 70 W, beam quality M2 factors were 1.2 in stable direction and 1.3 in unstable direction.

In-phase coupled single-mode gain waveguide array laser.

We utilize a sliced slab waveguide structure to produce a gain waveguide array. With this array, an in-phase locked single-mode frequency output with a single-peak intensity distribution without sidelobes and a highly spatially suppressed far-field distribution has been obtained.

Diode-end-pumped Nd:YVO4 slab laser with a compact negative confocal hybrid resonator

Laser diode-end-pumped Nd:YVO4 slab laser with a hybrid resonator operating at 1064 nm was carried out. The size of Nd:YVO4 crystal with 0.3 at.% doped concentration was 14 mm  ×  10 mm  ×  1 mm, which was cut along the a axis and the c axis was parallel with the 14 mm direction. By using a compact negative confocal unstable-stable hybrid resonator, 134 W 1064 nm laser output was realized with the M2 factors in the unstable direction and in the stable direction were 2.1 and 1.7 respectively. The slope efficiency and optical-to-optical efficiency were 49.3% and 40.2%, respectively.