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Related Experiment Video

Updated: Jun 6, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Diode-laser-to-waveguide butt coupling.

P Karioja, D Howe

|November 12, 2010

Summary

This summary is machine-generated.

A new model optimizes diode-laser-to-waveguide coupling by accounting for optical reflections. This model enhances alignment tolerances, improving power transfer efficiency in photonic devices.

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Area of Science:

Photonics and Optical Engineering
Semiconductor Device Physics

Background:

Efficient coupling between diode lasers and waveguides is crucial for integrated optical circuits.
Parasitic reflections from facets can significantly degrade coupling efficiency and cause power fluctuations.

Purpose of the Study:

To develop a comprehensive model for diode-laser-to-waveguide butt-coupling.
To analyze the impact of Fabry-Perot effects on coupling efficiency.
To investigate methods for improving alignment tolerances.

Main Methods:

A theoretical model incorporating Fabry-Perot interference effects was developed.
The model predicts coupling efficiency and power fluctuations based on laser-waveguide separation.
Simulations were performed for a diode laser coupled to a KTP waveguide.

Main Results:

The model accurately predicts coupling efficiency and identifies sources of power instability.
Antireflection coating on the waveguide facet increases transverse and angular alignment tolerances.
Index-matching gel enhances longitudinal alignment tolerance.

Conclusions:

The developed model provides critical insights into laser-waveguide coupling dynamics.
Optical coatings and index-matching materials are effective strategies to relax alignment tolerances.
This work facilitates the design of more robust and efficient photonic integrated devices.