Temperature-dependent cross section spectra for thulium-doped fiber lasers

Area of Science:

• Laser Physics
• Materials Science
• Spectroscopy

Background:

• Thulium-doped fiber lasers and amplifiers are critical for high-power applications.
• Accurate spectroscopic parameters are essential for optimizing laser design.
• Understanding temperature dependence is key to reliable performance across environments.

Purpose of the Study:

• To investigate the temperature dependence of spectroscopic parameters for trivalent thulium ions.
• To determine thulium absorption and emission cross sections over a broad spectral and temperature range.
• To develop models for predicting spectroscopic behavior under varying temperatures.

Main Methods:

• Absorption and emission measurements of thulium-doped fiber.
• Determination of thulium concentration profiles.
• Multi-Gaussian fitting of spectra with temperature-dependent parameters.
• Development and analysis of a physically motivated model for cross-section spectra.

Main Results:

• Thulium absorption/emission cross sections were determined between 700-2200 nm.
• Measurements covered a temperature range from -196°C to 300°C.
• Models were developed to estimate temperature-dependent spectral behavior.

Conclusions:

• The temperature dependence of spectroscopic parameters for thulium ions was successfully investigated.
• The determined cross sections and developed models are valuable for designing advanced thulium-doped fiber lasers.
• This research provides critical data for optimizing laser performance in diverse thermal conditions.