Gas-self-filter-based erbium-doped fiber loop laser for gas detection

Area of Science:

• Photonics and Spectroscopy
• Laser Technology
• Gas Sensing

Background:

• Erbium-doped fiber (EDF) lasers are crucial for various applications.
• Gas-self-filters (GSFs) offer a unique method for wavelength selection in interferometers.
• Accurate and calibration-free gas detection remains a significant challenge.

Purpose of the Study:

• To develop a GSF-based EDF loop laser capable of single or multiple wavelength emission.
• To demonstrate the efficacy of the GSF laser for gas detection using correlation spectroscopy.
• To highlight the potential of the GSF laser for multi-gas analysis without wavelength calibration.

Main Methods:

• An erbium-doped fiber loop laser incorporating a gas-self-filter (GSF) was designed and constructed.
• The GSF, a Mach-Zehnder interferometer with a gas cell, was tuned to match gas absorption lines for self-filtering.
• Correlation spectroscopy was employed to detect C₂H₂ gas using a single-wavelength GSF laser.

Main Results:

• A GSF-based multi-wavelength laser was successfully performed with a side-mode suppression ratio of approximately 50 dB.
• C₂H₂ gas detection using a single-wavelength GSF laser demonstrated good measurement linearity.
• The GSF laser system proved effective for selective gas detection.

Conclusions:

• The developed GSF-based EDF loop laser enables tunable single or multiple wavelength emission.
• The GSF laser is a promising tool for sensitive and selective gas detection, exemplified by C₂H₂ sensing.
• This technology offers advantages for multi-gas detection systems, potentially eliminating the need for wavelength calibration.