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High-speed asynchronous optical sampling with sub-50fs time resolution
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DOI：10.1364/OE.18.005974.png)
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摘要
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We report an ultrafast time-domain spectroscopy system based on high-speed asynchronous optical sampling operating without mechanical scanner. The system uses two 1 GHz femtosecond oscillators that are offset-stabilized using high-bandwidth feedback electronics operating at the tenth repetition rate harmonics. Definition of the offset frequency, i.e. the time-delay scan rate, in the range of a few kilohertz is accomplished using direct-digital-synthesis electronics for the first time. The time-resolution of the system over the full available 1 ns time-delay window is determined by the laser pulse duration and is 45 fs. This represents a three-fold improvement compared to previous approaches where timing jitter was the limiting factor. Two showcase experiments are presented to verify the high time-resolution and sensitivity of the system. (C) 2010 Optical Society of America
Keyword:
RAMAN-SCATTERING
DELAY-LINE
PULSES
SUPERLATTICES
EXCITATION
PHONONS
SPECTROSCOPY
GENERATION
SURFACE
ZNO
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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