Ultrafast measurements of optical spectral coherence by single-shot time-stretch interferometry.

摘要: The palette of laser technology has significantly been enriched by the innovations in ultrafast optical pulse generation. Our knowledge complex dynamics, which is often highly nonlinear and stochastic nature, however limited scarcity technologies that can measure fast variation/fluctuation spectral phase (or coherence) amplitude real-time, continuously. To achieve this goal, we demonstrate interferometry enabled time-stretch for real- time coherence characterization with microsecond-resolution. Accessing single-shot interferograms continuously, it further reveals degree second-order coherence, defined cross-spectral density function, at high speed-a capability absent any existing spectroscopic measurement tools. As technique simultaneously both high-speed variations spectrally resolved intensity, could create a new arena characterization, especially favorable probing understanding non-repetitive or dynamics real-time.