Efficient laser operation based on transparent Nd:Lu₂O₃ ceramic fabricated by Spark Plasma Sintering

Prior research has shown that ceramic materials can serve as effective laser hosts due to their optical transparency and mechanical stability. However, achieving high laser efficiency in rare-earth-doped ceramics remains a challenge. Earlier studies using Spark Plasma Sintering (SPS) to fabricate Nd:Lu2O3 ceramics reported lower slope efficiencies. This gap motivated the current investigation into optimizing the SPS process for improved laser performance. No prior work had resolved the full potential of SPS for Nd:Lu2O3 laser ceramics. The need for higher efficiency lasers in industrial and medical applications drives continued research in this area. The transition wavelengths of neodymium ions are well-established, but their performance in Lu2O3 ceramics remains underexplored. This study aims to bridge the gap between material fabrication and laser output optimization. The role of sintering parameters in determining optical properties is a key focus. The potential of Lu2O3 as a host for neodymium ions has not been fully realized in prior laser systems.

The aim of this study is to demonstrate efficient laser operation in transparent Nd:Lu2O3 ceramic produced via Spark Plasma Sintering. The specific problem addressed is the limited slope efficiency observed in previous SPS-fabricated Nd:Lu2O3 lasers. The motivation stems from the need for higher-performance solid-state lasers in various applications. The study focuses on optimizing the SPS process to enhance laser output. The researchers propose that improved sintering techniques can lead to better optical properties. The study targets the 4F3/2 to 4I11/2 and 4I13/2 transitions for laser emission. The goal is to achieve higher slope efficiency and stable output at specific wavelengths. The investigation seeks to validate the potential of SPS for advanced laser ceramics.

The researchers used Spark Plasma Sintering to fabricate the Nd:Lu2O3 ceramic. The process involved controlled temperature and pressure to ensure transparency. The ceramic was characterized for optical and structural properties. Laser experiments were conducted using a diode pump source. The 4F3/2 to 4I11/2 transition was tested for output power and efficiency. The 4F3/2 to 4I13/2 transition was also evaluated for performance. Spectral analysis was performed to identify emission wavelengths. The study compared results with previous SPS-based Nd:Lu2O3 laser reports.

The maximum output power of 1.25W was achieved at an absorbed pump power of 4.15W. The slope efficiency reached 38%, which is nearly double previous SPS results. Two spectral lines were observed at 1076.7nm and 1080.8nm. Simultaneous oscillation at these wavelengths was confirmed. The 4F3/2 to 4I13/2 transition produced a maximum output of 200mW. This occurred at an absorbed pump power of 2.7W. The emission wavelength for this transition was 1359.7nm. The results suggest improved laser performance from the SPS-fabricated ceramic.

The authors propose that the SPS process significantly enhances the laser efficiency of Nd:Lu2O3 ceramics. The 38% slope efficiency is a notable improvement over earlier studies. The dual-wavelength emission at 1076.7nm and 1080.8nm is a key finding. The 1359.7nm output from the 4I13/2 transition supports the material’s versatility. The study suggests that SPS is a viable method for high-efficiency laser ceramics. The results may guide future work on optimizing sintering parameters. The ceramic’s transparency and laser output are linked to the SPS process. The authors suggest further testing of the material in different laser configurations.