Abstract
Temperature dependence of thermal effect for neodymium doped yttrium orthovanadate crystal is quantified by measuring its dioptric power. With the boundary temperature range from 293 K to 353 K, the increase of fractional thermal load (lasing at 1064 nm, pumping at 888 nm) is from 16.9% to 24.9% with lasing, which is attributed to the rise of upconversion parameter and thermal conductivity. The influence of the boundary temperature on the output characteristic of a high-power single frequency laser is also investigated. The maximum output power decreases from 25.3 W to 13.5 W with the increase of boundary temperature from 293 K to 353 K. Analysis results indicate that further power scaling can be achieved by controlling the Nd:YVO(4) temperature to a lower.
Highlights
The Nd:YVO4 (Neodymium doped yttrium orthvanadate) transitions at 1064 nm have been widely used for laser applications, because it offers several advantages over other laser systems: its large stimulated-emission cross section at 1064 nm and high absorption over a wide pumping wavelength bandwidth allow a low laser threshold and a high slope efficiency
The results show that the thermal effect intensifies, the maximum output power and conversion efficiency decreases, with the rise of boundary temperature
We consider the upconversion-induced heat generation in Nd:YVO4 crystals, which is end-pumped by a fiber-coupled laser diode at different boundary temperatures, and establish the relation between the dioptric power and the absorbed pump power based on the measuring results
Summary
The Nd:YVO4 (Neodymium doped yttrium orthvanadate) transitions at 1064 nm have been widely used for laser applications, because it offers several advantages over other laser systems: its large stimulated-emission cross section at 1064 nm and high absorption over a wide pumping wavelength bandwidth allow a low laser threshold and a high slope efficiency. The Nd:YVO4 laser system exhibits a significantly increasing thermal effect under conditions of nonlasing [10, 14] This behavior has been explained by probability increase of ETU owing to higher population density in the upper lasing level [10, 15]. Until now, the influence of absolute boundary temperature of Nd:YVO4 crystal on the thermal effect and the output power of high-power laser has not been studied. In order to quantify the thermal effect, we measure the dioptric power of the Nd:YVO4 crystal at different boundary temperatures with lasing. The results show that the thermal effect intensifies, the maximum output power and conversion efficiency decreases, with the rise of boundary temperature
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