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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

Switchable dual-polarization external cavity tunable laser.

Tim Mueller, Alejandro Maese-Novo, Ziyang Zhang

|February 14, 2015

Summary

This summary is machine-generated.

This study demonstrates a tunable external cavity laser with hybrid integration. An on-chip thermo-optic switch balances dual TE/TM outputs, enabling polarization control.

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Area of Science:

Photonics
Integrated Optics
Semiconductor Lasers

Background:

External cavity lasers (ECLs) are crucial for tunable wavelength applications.
Hybrid integration offers advantages in combining different material functionalities.
Polarization control is essential for many optical communication and sensing systems.

Purpose of the Study:

To demonstrate a novel hybrid-integrated external cavity laser.
To achieve tunable emission with dual TE and TM polarization outputs.
To implement on-chip polarization control for output power balancing.

Main Methods:

Hybrid integration of an Indium Phosphide (InP) gain element with polymer waveguide circuits.
Incorporation of a half-wave plate for polarization manipulation.
Utilizing a thermo-optic switch (TOS) for dynamic control of optical paths.

Main Results:

Demonstrated a tunable external cavity laser with a 20 nm tuning range.
Achieved dual TE and TM outputs from a single oscillation region.
The TOS compensated for a 1.4 dB power penalty in the TM path.
Demonstrated polarization steering with approximately 10 dB extinction ratio.

Conclusions:

The hybrid-integrated laser with an on-chip TOS provides effective polarization control.
This technology enables dynamic adjustment of TE and TM output power.
The device shows promise for applications requiring tunable and polarization-controlled light sources.