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Near-infrared (769-770 nm) K atomic laser optically pumped through KXe excimer intermediate states
Optics Express
|February 20, 2026
Summary
This study demonstrates a novel hybrid atomic/molecular photodissociation laser using potassium and xenon vapor. This efficient laser system achieves significant lasing across a broad spectral region, showing promise for semiconductor laser array applications.
Area of Science:
- Atomic and Molecular Physics
- Laser Science and Photonics
Background:
- Potassium (K) and Xenon (Xe) vapor mixtures are utilized.
- The KXe excimer molecule plays a crucial role in the lasing process.
Purpose of the Study:
- To achieve lasing on the D1 line of atomic potassium via KXe excimer dissociation.
- To explore the potential of this hybrid laser system for various applications.
Main Methods:
- Photopumping of K/Xe vapor mixtures over a broad spectral region (>1.2 THz).
- Utilizing the dissociative B2Σ1/2+ or weakly bound A2Π3/2 states of KXe excimer.
- Achieving lasing between spin-orbit split 4p states of potassium.
Main Results:
- Lasing achieved on the D1 line of atomic potassium (4p2P1/2 → 4s2S1/2).
- Single-pulse energies up to ~35 µJ obtained.
- Lasing achieved over ~60% of the spectral gap between 4p states.
Conclusions:
- The KXe excimer system offers high quantum efficiency (>99%) and broad pump-acceptance bandwidth.
- This hybrid laser is suitable for pumping with free-running semiconductor laser arrays.
