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Related Experiment Video

Updated: May 10, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Note: a latched comparator circuit for triggering continuous-wave cavity ring-down spectroscopy.

Abdur Rasheed¹, Daniel B Curtis

¹Department of Chemistry and Biochemistry, California State University Northridge, 18111 Nordhoff Street, Northridge, California 91330-8262, USA.

The Review of Scientific Instruments

|July 5, 2013

Summary

This summary is machine-generated.

Continuous-wave cavity ring-down spectroscopy (CW-CRDS) is improved with a new circuit. This inexpensive latched comparator detects high light intensity, enabling rapid beam steering for faster, noise-free ring-down events.

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Area of Science:

Spectroscopy
Optical Physics
Electronics

Background:

Continuous-wave cavity ring-down spectroscopy (CW-CRDS) offers advantages over pulsed laser CRDS, including higher repetition rates and lower costs.
CW-CRDS requires a complex experimental setup for rapid laser switching during high-intensity periods to initiate ring-down events.

Purpose of the Study:

To describe an inexpensive and simple latched comparator circuit for CW-CRDS.
To enable rapid detection of light intensity thresholds for initiating ring-down events.

Main Methods:

Development of a latched comparator circuit.
Implementation of a circuit to detect light intensity above a threshold.
Integration of the circuit to steer the laser beam out of the cavity.

Main Results:

The circuit successfully detects high light intensity and signals for beam steering.
The latching mechanism prevents comparator switching during the ring-down event, eliminating noise.
The proposed circuit is inexpensive and simple to implement.

Conclusions:

The developed latched comparator circuit simplifies CW-CRDS experimental setups.
This circuit facilitates efficient and noise-free ring-down event initiation in CW-CRDS.
The solution offers a cost-effective method for improving CW-CRDS performance.