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Y-branch waveguide glass laser and amplifier.

N A Sanford, K J Malone, D R Larson

|September 25, 2009

Summary

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A novel Y-branch channel waveguide laser was fabricated using electric-field-assisted ion exchange in neodymium-doped silicate glass, demonstrating efficient laser operation and amplification near 1057 nm.

Area of Science:

Optoelectronics
Materials Science
Laser Physics

Background:

Integrated optical devices offer miniaturization and enhanced functionality.
Neodymium-doped waveguide lasers are crucial for various photonic applications.
Y-branch structures are essential for beam splitting and combining in integrated optics.

Purpose of the Study:

To fabricate and characterize a Y-branch channel waveguide laser.
To investigate the laser performance and amplification capabilities.
To assess the feasibility of overcoming Y-branch splitting losses in integrated lasers.

Main Methods:

Fabrication of a Y-branch channel waveguide laser using electric-field-assisted ion exchange in Nd-doped silicate glass.
Optical pumping with a continuous-wave Ti:sapphire laser.

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Characterization of laser efficiency, threshold, and small-signal gain.

Main Results:

The Y-branch waveguide laser operated efficiently near 1057 nm.
A slope efficiency of 5.1% was achieved with a 4% output coupler.
The device showed a low threshold of 26 mW absorbed pump power and a small-signal gain of 0.034 dB/mW.

Conclusions:

Electric-field-assisted ion exchange is a viable method for fabricating Y-branch waveguide lasers.
The demonstrated device overcomes the inherent 3-dB splitting loss of the Y-branch structure.
This work contributes to the development of compact and efficient integrated photonic devices.