Temperature-Dependent Stimulated Emission Cross-Section in Nd³⁺:YLF Crystal

Area of Science:

• Materials Science
• Solid-State Physics
• Spectroscopy

Background:

• Neodymium-doped yttrium lithium fluoride (Nd:YLF) is a significant material for laser applications.
• Understanding its temperature-dependent spectroscopic properties is crucial for optimizing laser performance.

Purpose of the Study:

• To investigate the temperature dependence (35 K–350 K) of spectroscopic properties for Nd:YLF.
• To determine stimulated-emission cross-sections and radiative decay times.
• To develop a semi-empirical formula for stimulated-emission cross-sections.

Main Methods:

• Absorption spectroscopy at room temperature (400–900 nm).
• Fluorescence lifetime measurements as a function of temperature.
• Aull-Jenssen technique for calculating stimulated-emission cross-sections.
• Extrapolation to 0 K for radiative decay time.

Main Results:

• Absorption and fluorescence spectra were characterized across a broad temperature range.
• Fluorescence lifetime and stimulated-emission cross-sections were determined for key transitions.
• Results validate previous room-temperature findings and extend them to lower temperatures.
• A semi-empirical formula was derived for stimulated-emission cross-sections between 250 K and 350 K.

Conclusions:

• The study provides comprehensive temperature-dependent spectroscopic data for Nd:YLF.
• The derived formula offers a predictive tool for laser design within a specific temperature range.
• Findings contribute to the development of advanced laser materials and systems.