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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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DFB semiconductor lasers based on reconstruction-equivalent-chirp technology.

Yitang Dai, Xiangfei Chen

    Optics Express
    |June 18, 2009
    PubMed
    Summary
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    A novel distributed feedback (DFB) semiconductor laser design uses a sampling structure to achieve equivalent phase shifts, enabling low-cost fabrication with standard technology. This method maintains external characteristics for high-performance lasers.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Devices
    • Laser Technology

    Background:

    • Phase-shifted distributed feedback (DFB) semiconductor lasers are crucial for various optical applications.
    • Traditional fabrication of phase-shifted DFB lasers involves complex etching processes to introduce precise phase shifts.
    • Achieving specific phase shifts, like lambda/4, is critical for laser performance but challenging to implement cost-effectively.

    Purpose of the Study:

    • To propose and numerically investigate a novel DFB semiconductor laser design.
    • To demonstrate an equivalent phase shift using a specially designed sampling structure.
    • To explore a low-cost fabrication method for high-performance DFB lasers.

    Main Methods:

    • Numerical investigation of a proposed DFB semiconductor laser structure.

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  • Design of a sampling structure to emulate a lambda/4 phase shift.
  • Analysis of external characteristics to confirm equivalence to actual phase shifts.

    • Main Results:

    • A DFB semiconductor laser design with equivalent phase shifts and chirps was successfully proposed and investigated.
    • It was shown that a lambda/4 phase shift can be equivalently achieved using a specially designed sampling structure.
    • The external characteristics of the laser remained unchanged compared to a laser with an actual phase shift.

    Conclusions:

    • The proposed DFB semiconductor laser structure offers an equivalent phase shift without actual phase shifts.
    • This novel structure can be fabricated using standard holographic technology, simplifying manufacturing.
    • The scheme presents a promising low-cost approach for producing high-performance DFB semiconductor lasers with complex structures.