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  • Lasers designed to emit optical ultrashort pulses with duration in the range of the femtoseconds (one fs = 10-15 second) well below one picosecond (one ps = 10-12 second). Femtosecond pulse lasers usually generate the ultrashort pulses using passive mode locking, typically achieved by incorporating a saturable absorber with appropriate characteristics into the laser resonator. There is a variety of lasers capable of generating femtosecond pulses, including solid-state lasers with a bulk piece of doped crystal or glass (i.e., bulk lasers, especially ttitanium:sapphire lasers), dye lasers, and mode-locking semiconductor (e.g., diode-pumped) lasers. Ultrashort pulse lasers are used in clinical applications for very accurate cutting such as those performed in ophthalmic surgery procedures.
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