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Face pumping of thin, solid-state slab lasers with laser diodes.
Optics Letters
|October 31, 2009
Summary
A novel face pumping technique efficiently delivers light to thin slab lasers using a slotted mirror and reflective chamber. This method achieves 28% slope efficiency and 65 mJ pulse energy in neodymium-doped glass lasers.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Face pumping is a common method for exciting slab lasers.
- Efficient pump light transfer is crucial for optimizing laser performance.
- Previous techniques faced limitations in delivering uniform and intense pumping to thin slabs.
Purpose of the Study:
- To introduce and evaluate a new face pumping technique for thin slab lasers.
- To enhance pump light transfer efficiency and multipass pumping.
- To investigate the relationship between slab thickness and gain.
Main Methods:
- Utilized 10 quasi-continuous-wave laser diode bars for pumping.
- Employed a slotted mirror for directing light into a rectangular, highly reflective pump chamber.
- Performed gain and loss measurements on thin neodymium-doped glass (Nd:glass) slabs with varying thicknesses (t = 0.45-1.04 mm).
Main Results:
- Achieved a slope efficiency of 28%.
- Obtained a maximum pulse energy of 65 mJ.
- Confirmed the predicted 1/t scaling of gain in thin slabs.
- Demonstrated high efficiency of pump light transfer.
Conclusions:
- The new face pumping technique significantly improves pump light transfer and multipass pumping efficiency.
- The 1/t scaling of gain is validated for thin slab lasers.
- This method offers a promising approach for developing high-performance thin slab lasers.
