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Updated: Jul 9, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
Published on: April 24, 2014
High-sensitivity intracavity laser absorption spectroscopy with vertical-external-cavity surface-emitting
A Garnache1, A A Kachanov, F Stoeckel
1Laboratoire de Spectrométrie Physique, B.P. 87, 38402 Saint Martin d'Hères Cedex, France.
High-sensitivity intracavity laser absorption spectroscopy was achieved using multiple-quantum-well vertical-external-cavity surface-emitting semiconductor lasers (VECSELs). This method reached a detection limit of 3 x 10(-10) cm(-1) with excellent signal-to-noise ratio.
Area of Science:
- Laser Spectroscopy
- Semiconductor Lasers
- Optical Sensing
Background:
- Intracavity laser absorption spectroscopy (ICLAS) offers high sensitivity for detecting trace gases.
- Vertical-external-cavity surface-emitting semiconductor lasers (VECSELs) are promising for tunable, high-power laser sources.
Purpose of the Study:
- To demonstrate high-sensitivity ICLAS using VECSELs.
- To investigate the spectrotemporal dynamics and performance of VECSELs for spectroscopy.
- To achieve a low detection limit for absorption measurements.
Main Methods:
- Utilized multiple-quantum-well VECSELs operating in the 1030-nm region.
- Employed continuous-wave (cw) optical pumping with a low threshold power (80 mW).
- Characterized the laser's broad tunability (approx. 75 nm) and baseline signal-to-noise ratio (up to 400).
Main Results:
- Achieved a detection limit of 3 x 10(-10) cm(-1) for absorption.
- Demonstrated stable cw operation at room temperature.
- Confirmed broad spectral tunability of the VECSEL.
Conclusions:
- VECSELs are effective for high-sensitivity intracavity laser absorption spectroscopy.
- The developed system offers a powerful tool for trace gas detection and analysis.
- Further research can explore VECSELs in other spectral regions for diverse applications.
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