Cavity Ring-Down Spectroscopy
A breakthrough discovery by Professor Kevin Lehmann, Ph.D., of Princeton University made the commercialization of this technique possible. He proved that compact, relatively inexpensive, and widely available Continuous Wave (CW) lasers can substitute for the costly, cumbersome pulsed lasers previously used in CRDS-based research. He thereby made the requisite power of light affordable and practical for commercial use.
Based on absorption spectroscopy, our Tiger Optics’ Cavity Ring-Down Spectroscopy (CRDS) works by attuning light rays to the unique molecular fingerprint of the sample species. By measuring the time, it takes the light to fade or “ring-down”, you receive an accurate molecular count in milliseconds. The time of light decay, in essence, provides an exact, non-invasive, and rapid means to detect contaminants in the air, in gases, and even in the breath.
This graph depicts the concept of ring-down decay within the cavity after the laser source is shuttered. As the laser light bounces back and forth between the ultra-high reflective mirrors, the sample species absorbs the light energy until it’s all gone.
In 2001, our Tiger Optics CRDS gas analyzers were the first commercial Cavity Ring-Down Spectroscopy (CRDS) analyzers available on the market. Today, our Tiger Optics CRDS gas analyzers monitor thousands of critical points for industrial and scientific applications. They serve the world’s national metrology institutes, where they function as transfer standards for the qualification of calibration and zero gases.