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Laser-written waveguides in KTP for broadband Type II second harmonic generation
Fredrik Laurell1, Thomas Calmano, Sebastian Müller
1Department of Applied Physics, KTH, Albanova, Roslagstullsbacken 21, 106 91 Stockholm, Sweden. fl@laserphysics.kth.se
Optics Express
|October 6, 2012
Summary
Femtosecond laser writing fabricated low-loss waveguides in KTP crystals for efficient green light generation. These waveguides demonstrated broad bandwidths for second harmonic generation, showing potential for optical applications.
Area of Science:
- Nonlinear optics
- Materials science
Background:
- Potassium titanyl phosphate (KTP) crystals are widely used for nonlinear optical applications.
- Efficient second harmonic generation (SHG) is crucial for various photonic devices.
Purpose of the Study:
- To fabricate waveguides in z-cut KTP using femtosecond laser writing.
- To investigate the performance of these waveguides for Type II second harmonic generation.
Main Methods:
- Femtosecond laser writing was employed to create waveguides in a z-cut KTP crystal.
- Optical characterization was performed to measure propagation losses and assess SHG efficiency.
Main Results:
- Waveguides with propagation losses below 0.8 dB/cm were successfully fabricated.
- Efficient, broad bandwidth, Type II birefringent second harmonic generation to the green was achieved.
- The temperature and wavelength bandwidths were measured to be 28°C·cm and 0.85 nm·cm, respectively.
Conclusions:
- Femtosecond laser writing is a viable technique for fabricating efficient KTP waveguides for nonlinear optics.
- The fabricated waveguides support broad bandwidth SHG, suitable for various green light generation applications.
