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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Wide-wavelength-tunable distributed Bragg reflector laser diode with high thermal efficiency.

Chul Wook Lee, Oh Kee Kwon, Ki Soo Kim

    Optics Express
    |October 20, 2023
    PubMed
    Summary

    We developed a new thermal isolation technique for distributed Bragg reflector (DBR) laser diodes. This method significantly widens the wavelength tuning range to 40 nm, improving cost-effectiveness for tunable laser sources.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Devices
    • Photonics

    Background:

    • Distributed Bragg reflector (DBR) laser diodes are crucial for tunable light sources.
    • Thermal tuning offers a method for wavelength adjustment in DBR laser diodes.
    • Existing thermal tuning methods face limitations in tuning efficiency and range.

    Purpose of the Study:

    • To propose and demonstrate a thermally-tuned DBR laser diode with enhanced tuning efficiency.
    • To achieve a wide wavelength tuning range using a novel thermal isolation structure.
    • To develop a cost-effective fabrication process for improved DBR laser diodes.

    Main Methods:

    • Fabrication of a DBR laser diode incorporating a gain, phase control (PC), and DBR region.
    • Implementation of micro-heaters on the DBR and PC regions for coarse and fine tuning.
    • Development of a thermal isolation structure using a reverse mesa etching process, avoiding InGaAs sacrificial layers.

    Main Results:

    • The fabricated DBR laser diodes exhibit effective heat confinement due to the thermal isolation structure.
    • An approximate wavelength tuning range of 40 nm was achieved.
    • This represents a nearly four-fold increase in tuning range compared to devices without thermal isolation.

    Conclusions:

    • The novel thermal isolation technique significantly enhances the wavelength tuning range of DBR laser diodes.
    • This approach offers a cost-effective solution for developing wide-wavelength-tuning DBR laser diode light sources.
    • The technology is suitable for applications requiring tunable laser sources with a broad spectral coverage.