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Self-frequency doubling in Nd,Sc(2)O(3):LiNbO(3) at room temperature
Optics Letters
|October 27, 2009
Summary
Neodymium Scandium doped Lithium Niobate crystals achieve self-frequency doubling at room temperature. This simplifies laser cavity design for efficient green light generation.
Area of Science:
- Materials Science
- Optics
- Laser Physics
Background:
- Lithium Niobate (LiNbO3) is a crucial material for nonlinear optical applications.
- Self-frequency doubling lasers combine laser oscillation and nonlinear frequency conversion in a single crystal.
- Optimizing doping elements is key to achieving efficient and practical self-frequency doubling.
Purpose of the Study:
- To investigate self-frequency doubling in Neodymium Scandium doped Lithium Niobate (Nd,Sc:LiNbO3) single crystals.
- To achieve room-temperature noncritical phase matching for efficient frequency conversion.
- To simplify laser cavity design by promoting s-polarized output.
Main Methods:
- Fabrication of Nd,Sc:LiNbO3 single crystals.
- Characterization of crystal properties and phase matching conditions.
- Quasi-continuous-wave (quasi-cw) laser operation and measurement of output power and efficiency.
Main Results:
- Demonstrated self-frequency doubling in Nd,Sc:LiNbO3 at room temperature (20°C).
- Achieved 90° noncritical phase matching (theta = 90°).
- Produced 0.14 mW of frequency-doubled 546-nm green light with 11%/W pump-to-green-light conversion efficiency.
- Observed a low lasing threshold of 25 mW absorbed input power.
- Exclusively obtained s-polarized fundamental 1092-nm oscillation, simplifying cavity configuration.
Conclusions:
- Nd,Sc:LiNbO3 is a promising material for efficient room-temperature self-frequency doubling.
- The 90° noncritical phase matching simplifies laser design by eliminating the need for Brewster windows.
- The s-polarized output is advantageous for type I phase matching, reducing optical complexity.
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