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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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All-electronic frequency stabilization of a DFB laser diode.

A Asmari, J Hodgkinson, E Chehura

|August 10, 2017

Summary

This study introduces a novel method for stabilizing laser diode wavelength by controlling junction voltage via dynamic resistance measurement. This technique significantly improves wavelength stability compared to conventional methods.

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Area of Science:

Optoelectronics
Laser Physics
Thermal Management

Background:

Laser diode junction voltage is a sensitive indicator of temperature.
Temperature fluctuations affect laser diode stability, impacting performance.
Existing thermal control methods have limitations in precision.

Purpose of the Study:

To develop a precise method for stabilizing laser diode wavelength.
To compensate for temperature-dependent internal resistance in laser diodes.
To improve upon conventional thermal control techniques.

Main Methods:

Measuring dynamic resistance (∂V/∂I) by modulating injection current.
Implementing a feedback loop to control junction voltage.
Comparing performance against thermistor control and uncompensated voltage control.

Main Results:

Achieved a residual mean frequency shift of 60 MHz (0.5 pm) for a 1651 nm DFB laser diode over a 15°C to 35°C range.
Demonstrated superior stability compared to conventional thermistor control (-8.4 GHz) and uncompensated voltage control (9.9 GHz).
The achieved stability was within the laser's inherent center frequency uncertainty (80 MHz).

Conclusions:

Controlling junction voltage via dynamic resistance measurement offers highly effective laser diode wavelength stabilization.
This method significantly outperforms traditional thermal control approaches.
The technique provides a robust solution for applications requiring precise laser wavelength control.