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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Channel waveguide lasers in Nd:LGS crystals.

Yingying Ren¹, Javier R Vázquez de Aldana, Feng Chen

¹School of Physics, State Key Laboratory of Crystal Materials and Key Laboratory of Particle Physics and Particle Irradiation, Ministry of Education, Shandong University, Jinan 250100, China.

|March 14, 2013

Summary

Ultrafast laser inscription created optical channel waveguides in Nd:LGS crystals. These novel 3D tubular structures achieved continuous-wave lasing at 1068 nm with low thresholds and efficient output.

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Area of Science:

Optics and Photonics
Materials Science
Laser Physics

Background:

Optical channel waveguides are crucial for integrated photonics.
Neodymium-doped Lanthanum Gallium Silicate (Nd:LGS) crystals offer potential for laser applications.
Fabrication methods for high-performance waveguides are actively researched.

Purpose of the Study:

To fabricate optical channel waveguides in Nd:LGS crystals.
To investigate the lasing performance of these waveguides.
To explore the utility of ultrafast laser inscription for creating 3D waveguide structures.

Main Methods:

Utilized ultrafast laser inscription to create depressed cladding waveguides.
Employed a circular cross-sectional, low refractive index track configuration.
Achieved continuous-wave (CW) laser operation at 1068 nm using 810 nm optical pumping.

Main Results:

Successfully produced 3D tubular channel waveguides in Nd:LGS.
Demonstrated room-temperature CW waveguide laser operation.
Achieved a minimum lasing threshold of 54 mW.
Obtained a maximum slope efficiency of 24%.
Reached a maximum output power of 16 mW.

Conclusions:

Ultrafast laser inscription is an effective method for fabricating optical channel waveguides in Nd:LGS.
The demonstrated waveguide lasers exhibit promising performance characteristics.
These results pave the way for advanced integrated optical devices based on Nd:LGS.