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Stable, 9.6 W, continuous-wave, single-frequency, fiber-based green source at 532 nm
G K Samanta1, S Chaitanya Kumar, M Ebrahim-Zadeh
1ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain. goutam.samanta@icfo.es
Optics Letters
|May 19, 2009
Summary
We developed a stable, high-power green laser source using MgO-doped lithium tantalate for efficient second-harmonic generation. This compact system achieves 9.64 W of single-frequency green output, demonstrating practical utility.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Materials Science
Background:
- High-power, single-frequency green lasers are crucial for various scientific and industrial applications.
- Existing methods often face challenges with stability, power, or complexity.
- Efficient frequency conversion of near-infrared lasers is a key research area.
Purpose of the Study:
- To develop a stable, high-power, continuous-wave (cw), single-frequency green laser source.
- To achieve efficient second-harmonic generation (SHG) using a compact and practical design.
- To utilize MgO-doped periodically poled stoichiometric lithium tantalate (MgO-ppSLT) for green light generation.
Main Methods:
- Employing a simple single-pass second-harmonic generation (SHG) configuration.
- Utilizing a continuous-wave (cw) ytterbium fiber laser operating at 1064 nm as the fundamental source.
- Using a 30-mm-long MgO-doped periodically poled stoichiometric LiTaO3 (MgO-ppSLT) crystal with a single grating.
Main Results:
- Generated 9.64 W of cw green radiation at 532 nm from 29.5 W of fundamental power.
- Achieved a single-pass conversion efficiency of 32.7%.
- Demonstrated excellent output stability (7.6% peak-to-peak fluctuation over 8 hours) and single-frequency operation (6.5 MHz instantaneous linewidth, <32 MHz frequency stability over 30 min) with a TEM00 spatial profile (M²<1.33).
Conclusions:
- The developed MgO-ppSLT based system offers a stable, high-power, single-frequency green laser source.
- The compact and practical design facilitates its use in diverse applications.
- This work highlights the potential of MgO-ppSLT for efficient nonlinear frequency conversion.
