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Related Concept Videos

Cascaded Op Amps01:16

Cascaded Op Amps

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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
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High-power continuous-wave interband cascade lasers with 10 active stages.

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    This study details the performance of 10-stage interband cascade lasers (ICLs) at mid-infrared wavelengths. These ICLs demonstrate high continuous wave output power and efficiency, setting new brightness records.

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    Area of Science:

    • Mid-infrared optoelectronics
    • Semiconductor laser technology

    Background:

    • Interband cascade lasers (ICLs) are crucial for mid-infrared applications.
    • Previous ICL designs faced limitations in output power and efficiency.

    Purpose of the Study:

    • To investigate the pulsed and continuous wave (cw) performance of 10-stage ICLs.
    • To compare the performance of 10-stage ICLs with earlier 7-stage designs.
    • To achieve high brightness and efficiency in mid-infrared ICLs.

    Main Methods:

    • Fabrication and characterization of 10-stage ICLs with specific ridge widths and cavity lengths.
    • Utilized high-reflection/anti-reflection coatings for enhanced performance.
    • Evaluated laser performance under pulsed and cw operation at 25°C.

    Main Results:

    • 10-stage ICLs exhibited higher slope efficiency compared to 7-stage devices.
    • Achieved up to 464 mW cw output power at 3.2-3.45 μm with a beam quality factor M(2) = 1.9.
    • Reached 18% cw wallplug efficiency at 25°C for both 7-stage and 10-stage devices with 1 mm cavity length.

    Conclusions:

    • 10-stage ICLs offer improved performance for mid-infrared applications.
    • The demonstrated high brightness and efficiency represent significant advancements in ICL technology.
    • Carrier-rebalanced designs are effective in optimizing ICL performance.