A laser peen forming is a sheet metal forming method using laser induced shock waves. The laser peen forming with an ultra-short-pulse laser is a kind of non-thermal and die-less forming process, and is favorable for micro forming. The authors applied the laser peen forming to the bending of pure titanium thin sheet with a picosecond laser and a femtosecond laser. The changes of bending properties with atmosphere and pulse duration were investigated. The femtosecond laser irradiation in air showed the best bending efficiency. The femtosecond laser is applicable to laser cutting, also. Some thin sheets were cut into complicated shapes and bent by laser peen forming with femtosecond laser. The combined process allowed the production of various complicated small parts.

Modulation of a laser frequency with a negligibly small residual amplitude modulation component has been demonstrated with a piezoelectric transducer-driven mirror. The vibrating-mirror method has been successfully applied to high-resolution spectroscopy of saturated absorption and to laser-frequency stabilization. The bandwidth of the stabilization feedback loop as wide as 15 kHz has been achieved to suppress acoustic noise in ordinary laboratory environment.

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