Abstract
Configurations are described for compact femtosecond Cr:LiSAF laser oscillators that operate with low pump-power thresholds. By way of illustration of resonator simplification, a progression of low-loss cavity designs from dual-prism through single-prism to prismless schemes is reviewed. A complete femtosecond laser system is described including the laser diode pump system and drivers that has a footprint as small as 22 cm × 28 cm, and a total electrical drive power of less than 1W! Examples of efficient and rugged femtosecond Yb:tungstate and Cr:YAG lasers are also described together with a brief outline of a demonstration in optical datacomms at rates above 1Tb/s for a scheme incorporating the latter laser.
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