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Efficient in-band pumped Ho:LuLiF(4) 2 microm laser.
J W Kim1, J I Mackenzie, D Parisi
1Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK. jwk@orc.soton.ac.uk
Optics Letters
|February 4, 2010
Summary
This study presents an efficient Holmium-doped Lithium Fluoride (Ho:LuLiF(4)) laser, in-band pumped by a fiber laser. It achieved high output power and slope efficiency, demonstrating potential for further advancements.
Area of Science:
- Laser Physics
- Solid-State Lasers
- Materials Science
Background:
- Efficient laser sources are crucial for various scientific and industrial applications.
- Holmium-doped materials offer potential for generating specific infrared wavelengths.
- In-band pumping strategies enhance laser efficiency by minimizing thermal load.
Purpose of the Study:
- To develop and characterize an efficient Ho:LuLiF(4) laser.
- To investigate the performance of in-band pumping using a Tm-doped fiber laser.
- To explore the impact of resonator design on laser output and efficiency.
Main Methods:
- In-band pumping of a Ho:LuLiF(4) crystal using a 1937 nm cladding-pumped Tm-doped fiber laser.
- Characterization of laser output power, wavelength, and slope efficiency under varying cavity output coupling.
- Measurement of beam quality using the beam propagation factor (M(2)).
Main Results:
- Achieved 5.1 W output at 2066 nm with 70% slope efficiency at low output coupling.
- Observed a shift to 2053 nm with 5.4 W output and 76% slope efficiency at high output coupling.
- Confirmed fundamental transverse mode (TEM(00)) operation with M(2) ≈ 1.1 at maximum output power.
Conclusions:
- The developed Ho:LuLiF(4) laser demonstrates high efficiency and output power.
- Resonator design significantly influences lasing wavelength and efficiency.
- The results indicate promising prospects for power scaling and improved efficiency in such laser systems.
