High-power and high optical conversion efficiency diode-end-pumped laser with multi-segmented Nd:YAG/Nd:YVO ₄

Abstract

A novel flat-flat resonator consisting of two crystals (Nd:YAG + Nd:YVO 4 ) is established for power scaling in a diode-end-pumped solid-state laser. We systematically compare laser characteristics between multi-segmented (Nd:YAG + Nd:YVO 4 ) and conventional composite (Nd:YAG + Nd:YAG) crystals to demonstrate the feasibility of spectral line matching for output power scale-up in end-pumped lasers. A maximum continuous-wave output power of 79.2 W is reported at 1064 nm, with M 2 x = 4.82, M 2 y = 5.48, and a pumping power of 136 W in the multi-segmented crystals (Nd:YAG + Nd:YVO 4 ). Compared to conventional composite crystals (Nd:YAG + Nd:YAG), the optical-optical conversion efficiency of multi-segmented crystals (Nd:YAG + Nd:YVO 4 ) from 808 nm to 1064 nm is enhanced from 30% to 58.8%, while the laser output sensitivity as affected by the diode-laser temperature is reduced from 55% to 9%.

Continuous wave and active Q-switched operation of Watt-level LED-pumped two-rod Nd,Ce:YAG laser

“…And the experimentally measured thermal focal length value is greater than 3 m. Combined with the measured thermal focal length value and theoretical analyses of laser cavity mode, it can be concluded that the marked ranges a and b correspond to the power-stable region and mode-stable region within LEDpumped CW solid-state laser's optimal working stability zone, while the marked mode-stable region c and power-stable region d within the traditional LD-pumped CW solid-state laser are optima work stability zone. [19][20][21][22][23][24][25]25] Due to the thermal accumulation from LED CW pumping, the temperature difference between the crystal's interior and thermal distortion gradually increase, resulting in a transition from range a to range b in the laser stable area. Moreover, the value of thermal focal length gradually becomes smaller, and the value of the fundamental mode spot radius ω 0 and mode volume also decreases accordingly.…”

An LED-Side-Pumped Intracavity Frequency-Doubled Nd,Ce:YAG Laser Producing a 2W Q-Switched Red Beam

“…The results of the power density in the crystal was low, and the overlap between TEM00 and LED pump modes was deviated. [10][11][12][13][14][15] Thus, to capture more emission from the LED to enhance the coupling efficiency and enable higher mode matching, it was necessary to modify the LED emission mechanism, optimize the pump structure and increase the area fill factor to achieve a higher-efficiency LED pump laser. In this work, we analyze the emission mechanism of LEDs and address the coupling efficiency of LED-pumped lasers using non-diffuse scattering LEDs to rationalize the five-way pumping structure of LEDs.…”