Thermal effects of the diode end-pumped Nd:YVO4 slab

5 W average output power was achieved with a diode-end-pumped Nd:YVO/sub 4/ regenerative amplifier at a repetition rate of 35 kHz. A commercial 10-psoscillator was used as seed pulse source. Stable TEM/sub 00/ operation was obtained.

High average power diode-pumped Nd:YVO/sub 4/ regenerative laser amplifier for picosecond-pulses

We have developed a novel electro-optic Q-switched diode-end-pumped solid slab laser that combines high energy, short pulse width, high repetition rates, and diffraction-limited beam quality. With two partially end-pumped Nd:YLF slabs and a 100 mm long off-axis positive branch stable-unstable oscillator, 24.2 mJ, 7.1 ns electro-optic Q-switched pulse at 1 kHz repetition rate with a beam quality of Mx2=1.4 and My2=1.3 was generated. The peak power reached 3.5 MW. Efficient external second-harmonic generation was achieved by use of lithium triborate with low peak-power intensity.

Diode-end-pumped double Nd:YLF slab laser with high energy, short pulse width, and diffraction-limited quality.

An overview on current trends in stimulated Brillouin scattering and optical phase conjugation is given. This report is based on the results of the “Second International Workshop on stimulated Brillouin scattering and phase conjugation” held in Potsdam/Germany in September 2007. The properties of stimulated Brillouin scattering are presented for the compensation of phase distortions in combination with novel laser technology like ceramics materials but also for e.g., phase stabilization, beam combination, and slow light. Photorefractive nonlinear mirrors and resonant refractive index gratings are addressed as phase conjugating mirrors in addition.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/8305A06ED0CA6FD9A9145EF40CBD06B6/S0263034608000335a.pdf/div-class-title-trends-in-stimulated-brillouin-scattering-and-optical-phase-conjugation-div.pdf

Trends in stimulated Brillouin scattering and optical phase conjugation

Electron paramagnetic resonance (EPR) has been used to characterize three distinct V4+ centres in undoped Czochralski-grown yttrium orthovanadate (YVO4) crystals. These EPR signals are observed at low temperatures, and their average c-axis splittings between adjacent 51V hyperfine lines are 40?G, 123?G, and 140?G. We refer to these centres as [V4+]A, [V4+]B, and [V4+]C, respectively. The [V4+]A and [V4+]B centres are present in as-grown crystals. Exposure at 77?K to ionizing radiation (x-rays or an ultraviolet laser beam) destroys these centres and creates the [V4+]C centres. The as-grown state of the crystal is restored upon returning to room temperature. Angular dependence data are used to determine the principal values and principal directions of the g tensor and the 51V hyperfine tensor for each of the centres. We suggest that the [V4+]A centre is a V4+ ion adjacent to an oxygen vacancy and that the [V4+]B centre is a V4+ ion substituting for a Y3+ ion (i.e.?a vanadium antisite defect). The [V4+]C centre is assigned to a V4+ ion at a regular vanadium site with a nearby stabilizing defect, possibly a Zr4+ on a Y3+ site. In as-grown crystals, there is a correlation between the number of [V4+]A centres and the intensity (at 380?nm) of a broad near-edge optical absorption band. This band, now associated with oxygen vacancies, gives YVO4 a 'yellow' appearance.

https://iopscience.iop.org/article/10.1088/0953-8984/16/39/040/pdf

Electron paramagnetic resonance and optical absorption study of V^4^+ centres in YVO~4 crystals

We report on a compact and highly efficient diode-end-pumped TEM00Nd:YVO4 slab laser with an output power of 103 W and beam quality M2≦1.5. The optical-to-optical efficiency was 41.5%. In electro-optically Q-switched operation, 83 W of average power at a pulse-repetition rate of 50 kHz with a pulse length of 11.3 ns was obtained. At a pulse-repetition rate of 10 kHz, 5.6 mJ of pulse energy, and 870 kW of peak power were measured.

Xiaoyu Wei

Papers

Electro-optically Q-switched Nd:YVO4 slab laser with a high repetition rate and a short pulse width