Optically pumped semiconductor lasers are scalable up to several 10ths of Watts of output power, maintaining
excellent beam quality and high reliability. A further key advantage of the OPS technology is wavelength flexibility:
the accessible wavelength range spans from 915 nm to 1180 nm. Frequency doubling expands this into the blue to
yellow spectral range. The current investigation aims at applications (such as Raman spectroscopy) where ultra-narrow
bandwidth lasers are required. Results of a single frequency green-yellow OPS laser will be presented.
We present an air-cooled optically pumped semiconductor laser that provides a cw output power of 1W at 488
nm. This performance was achieved via intracavity frequency doubling at a laser diode pump power of 2.5
Watts. The increased efficiency was realized by optimizing the OPS chip design and improving the heat
extraction from the OPS chip. Efficient cooling of the OPS chip and a compact and mechanically stable folded
resonator provide maintenance-free long life laser operation with an M2 of less than 1.1 and a noise of less than
0.25% rms. The size of the laser head is the same as for the 20 mW commercially available version, namely
125 x 70 x 34 mm.
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