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Simple high-precision diode laser system with digital control.

Suman Garain, Amitava Bandyopadhyay, Dipankar Bhattacharyya

    Applied Optics
    |February 23, 2023
    PubMed
    Summary
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    A new tunable diode laser system was developed for lab use, controlled by an AVR microcontroller and message passing interface. The system demonstrates stable performance, validated by cesium absorption spectra measurements.

    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Laser Physics and Technology
    • Experimental Physics

    Background:

    • Precise wavelength control is crucial for spectroscopic applications.
    • Existing tunable diode laser systems may lack flexibility or require complex setups.
    • Microcontroller-based systems offer potential for compact and adaptable laser control.

    Purpose of the Study:

    • To design and fabricate a simple, wavelength-tunable diode laser system for laboratory applications.
    • To implement a robust control system using an AVR microcontroller and message passing interface (MPI).
    • To evaluate the stability and performance of the developed laser system.

    Main Methods:

    • A distributed feedback (DFB) diode laser with a central wavelength of 852.3 nm was used for testing.

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  • Current and temperature controllers were developed based on an AVR microcontroller.
  • Experimental controls were implemented using daemon programs within an MPI environment for distributed operation.
  • Noise spectral analysis of the current controller was performed with and without the diode laser as a load.
  • Absorption spectra of the 6S1/2→6P3/2 transition of Cesium-133 (133Cs) were recorded.

    • Main Results:

    • The developed tunable diode laser system demonstrated stable operation.
    • Noise spectral analysis confirmed the effectiveness of the current controller.
    • The system successfully recorded the absorption spectra of 133Cs, validating its spectroscopic capabilities.
    • The MPI environment allowed for flexible control across separate computers.

    Conclusions:

    • A functional and stable wavelength-tunable diode laser system has been successfully designed and fabricated.
    • The microcontroller and MPI-based control architecture provides a flexible and robust platform for laser experiments.
    • The system is suitable for precise spectroscopic measurements, as evidenced by the 133Cs absorption spectra.