A 4 ps high-sensitivity optical sampling scheme based on a fast GaAs saturable absorber created by heavy-ion irradiation is demonstrated. The intensity-invariant saturable absorber permits high-level inhomogeneous pumping leading to a high open/close ratio of 1000 and to a system sensitivity limited by the level of saturable absorber spontaneous emission.
Inspec keywords: signal sampling; spontaneous emission; gallium arsenide; ion beam effects; laser mode locking; optical variables measurement; optical saturable absorption; pulse measurement; high-speed optical techniques; III-V semiconductors
Other keywords:
Subjects: Optical saturation and related effects; Laser beam modulation, pulsing and switching; mode locking and tuning; Radiation effects (semiconductor technology); Ion beam effects; Laser beam modulation, pulsing and switching; mode locking and tuning; Optical variables measurement; Optical instruments and techniques; Optical transient phenomena, self-induced transparency, optical saturation and related effects; Ultrafast optical techniques
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