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Efficient Tm:LuVO₄ laser at 1.9 μm
Haohai Yu1, Zhongben Pan, Huaijin Zhang
1State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China.
Optics Letters
|July 5, 2011
Summary
Researchers developed an efficient 1.9 μm laser using a diode-pumped thulium-doped lutetium vanadate (Tm:LuVO₄) crystal. This study achieved the first π-polarized Tm:LuVO₄ laser, demonstrating potential for high-power applications.
Area of Science:
- Solid-state laser physics
- Materials science
- Photonics
Background:
- Thulium-doped crystals are crucial for generating mid-infrared laser light around 2 μm.
- Lutetium vanadate (LuVO₄) offers promising thermo-mechanical properties for laser applications.
- Achieving efficient laser operation in specific polarization states is key for advanced optical systems.
Purpose of the Study:
- To demonstrate an efficient laser-diode-pumped Tm:LuVO₄ crystal laser operating at approximately 1.9 μm.
- To achieve and characterize the π-polarized laser emission from Tm:LuVO₄ for the first time.
- To evaluate the suitability of Tm:LuVO₄ for high-power laser applications.
Main Methods:
- Utilized a laser-diode-pumped configuration to excite the Tm:LuVO₄ crystal.
- Investigated the laser performance, including output power and slope efficiency.
- Analyzed the laser wavelength characteristics and their dependence on intracavity light intensity.
Main Results:
- Achieved a maximum output power of 1.32 W with a slope efficiency of 28.7% for the π-polarized Tm:LuVO₄ laser.
- Confirmed laser operation at approximately 1.9 μm.
- Observed a blue-shift in the central laser wavelength with increasing intracavity light intensity.
Conclusions:
- The π-polarized Tm:LuVO₄ laser operating at 1.9 μm is demonstrated efficiently.
- The a-cut Tm:LuVO₄ crystal is identified as suitable for high-power laser applications.
- Wavelength shift is attributed to the reabsorption effect within the Tm:LuVO₄ crystal.
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