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Ultrashort light pulse semiconductor laser device and wavelength conversion type ultrashort light pulse generator
Ultrashort light pulse semiconductor laser device and wavelength conversion type ultrashort light pulse generator
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机译：超短光脉冲半导体激光装置及波长转换型超短光脉冲发生器
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摘要
PURPOSE:To obtain short wavelength laser beam pulses having a high output and in a very short time by conducting mode locking by TM mode oscillation and coupling beam pulses with an optical guide type wave-length changing element. CONSTITUTION:Currents are injected to the active layer 10 of a semiconductor laser 16 from a power supply 38. Laser beams 40 emitted from a first end face 14 on which an antireflection film 15 is shaped are passed through a lens 42, a polarizer 44, through which only a TM polarizing component is passed, and an etalon 46 as a wave-length controller, and reflected by an external reflector 22 and fed back to the semiconductor laser 16. When inrush currents are modulated by the round trip frequency f=2L/C (in formula, C represents light velocity and L a distance between the end face 12 of the laser 16 and the reflector 22) of an external resonator, beam pulses 48 for a time (1ps or less) shorter than conventional devices are acquired. It is because the residual reflectivity of the antireflection film 18 is reduced at a TM mode. The beam pulses can be coupled directly with a wave changing element, thus acquiring short wave-length pulses having a high output.
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