Yefei Mao

8.4mJ, 10kHz, 3.6ns, Nd:YVO 4 slab amplifier

A diode-pumped nanosecond eight-pass amplifier with Nd:YVO4 crystal was developed. Combined with the advantages of direct pumped and Innoslab structure, a high energy pulse was obtained by using the wedged multi-folded configuration with two plane mirrors. The 0.4mJ Q-switched seed at the pulse repetition frequency of 10kHz was amplified to 8.4mJ with the pump power of 330W, and the corresponding optical-to-optical efficiency was 29.8%. The M2 factors in the horizontal direction and vertical direction were 1.48 and 1.39, respectively. And no remarkable of ASE was observed.

Double-end-pumped Nd:YVO4 slab laser at 1064 nm

We demonstrate a high-power laser diode stacks double-end-pumped Nd:YVO4 1064 nm slab laser with a folded stable-unstable hybrid resonator. An output power of 220 W was obtained at the pump power of 490 W with optical conversion efficiency of 44.9%. At the output power of 202 W, the M2 factors in the unstable direction and in the stable direction were 1.7 and 2.3, respectively.

A high-power diode-pumped Nd:YVO4 slab amplifier with a hybrid resonator

We demonstrated a compact and efficient in-band diode-pumped Nd:YVO4 partially end-pumped slab (Innoslab) nanosecond amplifier based on a hybrid resonator. For the seeder source, a-6 W, 5 ns Q-switched laser with a repetition rate of 30 kHz was obtained with beam quality factors M 2 < . A beam-shaping system consisting of cylindrical lenses was designed according to the different sizes of the active medium in two orthogonal directions. A maximum average output power of 77 W was obtained. The optical-to-optical efficiency was 27.9%. The beam quality factors M 2 in the unstable and stable directions were 1.52 and 1.36, respectively.

77 W high beam quality Nd:YVO4 Innoslab amplifier

We reported a compact and efficient Nd:YVO4 partially end-pumped slab (Innoslab) nanosecond amplifier. The power of the seed was 5 W at a pulse repetition rate of 30 kHz with beam quality factors of M 2 < 1.3. A plane–plane cavity was used in the amplifier for high efficiency. With effective shaping of the seed laser, the output of 77 W was obtained under the pump power of 378 W without self-excitation. The optical to optical conversion efficiency was 23.8%, and the beam quality factors of M 2 were 1.52 and 1.32 in the horizontal direction and in the vertical direction, respectively.

340 W Nd:YVO4 Innoslab laser oscillator with direct pumping into the lasing level

We present a high power 340 W Nd:YVO4 Innoslab laser end-pumped by 880 nm laser-diode stacks. A maximum output power of 340 W was obtained at the absorbed power of 710 W with optical conversion efficiency up to 47.9 %. At the output power of 300 W, the M-2 factors in the unstable direction and the stable direction were 2.1 and 3.4, respectively.

High-average-power and high-beam-quality Innoslab picosecond laser amplifier

We demonstrated a laser-diode, end-pumped picosecond amplifier. With effective shaping of the seed laser, we achieved 73 W amplified laser output at the pump power of 255 W, and the optical-optical efficiency was about 28%. The beam propagation factors M(2) measured at the output power of 60 W in the horizontal direction and the vertical direction were 1.5 and 1.4, respectively.

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.

High-Power Continuous-Wave Nd:GdVO4 Solid-State Laser Dual-End-Pumped at 880nm

A high-power cw all-solid-state Nd:GdVO4 laser operating at 880nm is reported. The laser consists of a low doped level Nd: GdVO4 crystal dual-end-pumped by two high-power diode lasers and a compact negative confocal unstable-stable hybrid resonator. At an incident pump power of 820 W, a maximum cw output of 240W at 1064nm is obtained. The optical-to-optical efficiency and slope efficiency are 40.7% and 53.2%, respectively. The M-2 factors in the unstable direction and in the stable direction are 4.38 and 5.44, respectively.