Neodymium concentration measurements in Nd:YLF laser rods: a nondestructive method

Area of Science:

• Materials Science
• Spectroscopy
• Laser Technology

Background:

• Accurate measurement of dopant concentration is crucial for optimizing laser performance.
• Neodymium-doped Yttrium Lithium Fluoride (Nd:YLF) is a key material in solid-state lasers.
• Existing methods for dopant analysis may be destructive or lack precision.

Purpose of the Study:

• To develop and validate a nondestructive method for quantifying Nd(3+) concentration in Nd:YLF laser rods.
• To establish a reliable calibration curve for Nd(3+) concentration measurements.
• To demonstrate the application of the method for analyzing concentration gradients within crystals.

Main Methods:

• Utilized micro-Raman spectroscopy to compare Nd(3+) luminescence line intensities with LiYF(4) host matrix Raman lines.
• Optimized experimental conditions for accurate spectral acquisition and analysis.
• Investigated Nd(3+) concentrations in the range of 0-2 atomic percent.

Main Results:

• Presented a calibration curve for Nd(3+) concentration versus spectral intensity ratio.
• Achieved a relative error not exceeding 10% in standard measurements.
• Successfully applied the method to study concentration gradients in Nd:YLF crystals.

Conclusions:

• The developed micro-Raman spectroscopy method offers a precise and nondestructive approach for Nd(3+) concentration measurement in Nd:YLF.
• The method allows for the determination of dopant distribution within laser crystals.
• The distribution coefficient of Nd(3+) in LiYF(4) was successfully deduced using this technique.