Distributed feedback sol-gel zirconia waveguide lasers based on surface relief gratings

Area of Science:

• Materials Science
• Optoelectronics
• Photonics

Background:

• Development of efficient and tunable waveguide lasers is crucial for various photonic applications.
• Sol-gel zirconia films offer promising optical and material properties for laser fabrication.
• Permanent grating structures are essential for stable distributed feedback (DFB) laser operation.

Purpose of the Study:

• To demonstrate distributed feedback waveguide lasers utilizing dye-doped sol-gel zirconia films.
• To create permanent grating structures for enhanced laser stability and performance.
• To achieve tunable output wavelengths in the visible spectrum.

Main Methods:

• Fabrication of sol-gel zirconia films doped with laser dyes (rhodamine 6G).
• Generation of permanent surface relief gratings using a novel epoxy-based azo-polymer and photo-isomerization.
• Integration of gratings with dye-doped films to form DFB waveguide lasers.
• Tuning of laser output wavelength by adjusting the grating orientation relative to the pump beam.

Main Results:

• Successful demonstration of DFB waveguide lasers based on dye-doped sol-gel zirconia films.
• Realization of permanent grating structures via photo-induced isomerization in azo-polymers.
• Achieved tunable output wavelengths ranging from approximately 575 nm to 610 nm.
• Demonstrated wavelength tunability by altering the angle between the grating and the pump beam.

Conclusions:

• Dye-doped sol-gel zirconia films with permanent gratings are effective for DFB waveguide lasers.
• The photo-isomerization method provides a reliable way to create permanent grating structures.
• Tunable wavelength output is achievable, highlighting the potential for versatile laser sources.