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Femtosecond laser-induced apodized Bragg grating waveguides
Peter Zeil1, Christian Voigtländer, Jens Thomas
1Department of Applied Physics, Royal Institute of Technology, Stockholm 10691, Sweden.
Optics Letters
|July 2, 2013
Summary
We inscribed Bragg grating waveguides (BGWs) in fused silica using a fs laser. Gaussian apodization improved sideband suppression by 10 dB, enhancing optical guiding properties.
Area of Science:
- Optics and Photonics
- Materials Science
- Laser Technology
Background:
- Bragg grating waveguides (BGWs) are crucial optical components.
- Achieving precise control over grating coupling strength is essential for device performance.
- Previous methods lacked methods for homogeneous guiding properties.
Purpose of the Study:
- To report the inscription of apodized BGWs in fused silica.
- To demonstrate tailoring of grating coupling strength.
- To improve sideband suppression in BGWs.
Main Methods:
- Utilizing a modulated high repetition rate femtosecond (fs) laser system.
- Employing substructuring of laser modulation for tailored grating coupling strength.
- Fabricating BGWs with Gaussian apodized modulation profiles.
Main Results:
- Successfully inscribed apodized BGWs in fused silica.
- Achieved an unchanged constant mean refractive index for homogeneous guiding.
- Demonstrated a 10 dB improvement in sideband suppression compared to uniform gratings.
Conclusions:
- Apodized BGWs fabricated with Gaussian modulation offer superior performance.
- The fs laser inscription method allows for precise control over optical properties.
- This technique advances the development of efficient optical waveguides.
