Cavity Ring-Down Spectroscopy 

Unmatched Measurement Quality and Reliability 

Detection at the Speed of Light

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, the 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.

Ideal CRDS Applications:

  • Bulk gas continuous quality control (CQC) monitoring; pre- and post-purifier trace impurity measurements
  • Quality monitoring for process specialty gases
  • Real-time monitoring for trace H2O and HF in semiconductor process equipment
  • Next-generation trace gas analyzers for detection and continuous monitoring of airborne molecular contaminants in semiconductor cleanrooms


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