The green lasers perform better than IR lasers in many applications, such as processing of some materials with high IR reflectivity (e.g. Cu, Au), precision micro fabrication (e.g. solar cells manufacturing), laser therapy of benign prostatic hyperplasia (e.g. the GreenLight HPS™ Laser System from AMS) and underwater communication due to lower absorption in water. Besides, the high power green lasers are usually used to pump Ti: sapphire laser systems and generate UV lasers (e.g. 355nm, 266nm).
We have obtained an average power of 180.2 W at 532 nm with a repetition rate of 10 kHz using a compact straight cavity with two diode-side-pumped Nd:YAG laser modules. The corresponding electrical-to-optical efficiency is about 10.9%，which is believed to be the highest electrical-to-optical conversion efficiency of the high power green laser sources with above 100 W output power, ever reported. The pulsewidth was 70 ns and the peak power was 257.4 kW. The beam parameter product (beam waist multiplied by half beam divergence angle) was estimated to be 4.2 mm·mrad (M2≈25) and the power fluctuation over 2.5 hours was calculated to be better than ±1.2%.
Green laser pulse at 180 W with a repetition rate of 10 kHz
The pulsewidth was 70ns.
Two-dimensional far-field intensity profile of 532 nm beam at about 180 W