Abstract
A real-time spectroscopic technique called time-wavelength optical sampling (TWOS) is investigated. TWOS combines the concepts of time-stretch spectroscopy (TSS) and ultrafast optical sampling to address some of the challenges facing the conventional TSS, such as its overreliance on detector speed and the inherent tradeoff between spectral resolution and signal-to-noise ratio. Using optical sampling by laser cavity tuning (OSCAT), a spectral resolution of 710 MHz has been achieved in the 1.5 µm wavelength range. A 15-dB improvement in low-power tolerance and a frame rate as high as 2 kHz for real-time measurement are also demonstrated. This work sets the benchmark performance for TWOS spectroscopy and thereby lays out a path towards practical applications of this new technique.
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