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Related Experiment Video

Updated: Jun 29, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Monolithic beam combined quantum cascade laser arrays with integrated arrayed waveguide gratings.

Tushar Sanjay Karnik, Laurent Diehl, Khoi Phuong Dao

    Optics Express
    |April 4, 2024
    PubMed
    Summary

    We developed a compact, high-power mid-infrared laser by integrating quantum cascade lasers (QCLs) with an arrayed waveguide grating. This wavelength beam-combined (WBC) laser offers flexible multiwavelength emission for advanced applications.

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    Area of Science:

    • Optoelectronics
    • Infrared Photonics
    • Semiconductor Lasers

    Background:

    • Quantum cascade lasers (QCLs) are key mid-infrared sources due to their design flexibility and compact size.
    • High-power, multiwavelength QCLs with good beam quality are crucial for applications like hyperspectral imaging.

    Purpose of the Study:

    • To demonstrate a monolithic, wavelength beam-combined (WBC) mid-infrared laser source.
    • To integrate multiple QCL gain sections with an arrayed waveguide grating (AWG) on a single chip.

    Main Methods:

    • Fabrication of a monolithic chip integrating five QCL gain sections and an AWG.
    • Utilizing optical feedback from cleaved facets for lasing.
    • Employing the AWG to lock emission spectra and spatially combine laser signals.

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    Related Experiment Videos

    Last Updated: Jun 29, 2025

    Gradient Echo Quantum Memory in Warm Atomic Vapor
    10:00

    Gradient Echo Quantum Memory in Warm Atomic Vapor

    Published on: November 11, 2013

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    Writing Bragg Gratings in Multicore Fibers
    08:48

    Writing Bragg Gratings in Multicore Fibers

    Published on: April 20, 2016

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    Main Results:

    • Achieved a monolithic WBC infrared laser source operating at λ ∼ 4.9 µm.
    • Demonstrated high peak power exceeding 0.6 W per channel from a common aperture.
    • Obtained a side-mode suppression ratio (SMSR) > 27 dB in pulsed mode.
    • Implemented an active/passive integration for a robust, regrowth-free design.

    Conclusions:

    • The developed WBC QCL chip offers a compact and powerful mid-infrared solution.
    • This technology enables seamless integration and robust performance.
    • Paves the way for advanced compact mid-IR sources for applications including hyperspectral imaging.