Abstract
For the light source of photocoagulators for ophthalmology, an orange laser is more suitable. We developed two orange fiber lasers (580 nm and 590 nm) to investigate the effectiveness depending on the different wavelengths in the range of orange. The 580 nm laser is composed of a 1160 nm fiber laser and a PPLN crystal for second harmonic generation. Continuous-wave 1.3 W output power of 580 nm was obtained with 5.8 W input power of 1160 nm. The 590 nm laser is almost the same as the 580 nm laser source. In this case we used a Raman shift fiber to generate 1180 nm, and the output power of 590 nm is 1.4 W. We newly developed an evaluation model of the photocoagulator system using these two laser sources. The coagulation output power was 700 mW, which is enough for usual laser photocoagulator systems. This photocoagulator system showed excellent performance in the field evaluation using colored laboratory rabbits.
