| Popis: |
It is very difficult to achieve both high-power and low divergence lasing at once in cw or high-repetition rate lasers because thermal effects limit their efficiency. But as these effects are stable over time, a passive correction is conceivable. In this paper we propose a very simple but effective method to compensate the thermal effects in such lasers, using an aspherical phase-plate inside the resonator. The first results are very promising, as we demonstrated a very stable 418 W, M 2 =5.7 laser for only 2280 W of total optical pumping power (i.e 2050 W of absorbed pump power). |
