Bruce A. Richman

TL;DR: In this article, the authors summarize the problem of measuring an ultrashort laser pulse and describe in detail a technique that completely characterizes a pulse in time: frequency-resolved optical gating.

TL;DR: The ability of the instrument to obtain delta13C values in breath samples with sufficient precision to serve as a useful medical diagnostic is demonstrated.

TL;DR: In this paper, a calibration method based on detecting inter-mode optical transitions (mode hopping) is described, which can be adjusted during operation to switch quickly from one cavity mode to another in stepwise fashion.

TL;DR: The extension of this ring-down to the 2 μm region would enable isotopic analysis at ambient concentrations, which, combined with the small size, robust design, and potential for frequent measurements at a remote site, make CRDS technology attractive for remote atmospheric measurement applications.

TL;DR: In this article, the authors describe several applications of quasi-phase-matched (QPM) light sources to remote and local chemical sensing, including a cavity ring down spectrometer that employs a novel optical parametric generator-amplifier to achieve ≥350 cm-1 of contiguous tuning and a long-wave infrared light source based on QPM GaAs.