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Comparison of mode-locking performance in monolithic two-section InAs/InP quantum dot and InGaAsP/InP quantum well

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    Summary
    This summary is machine-generated.

    Self-mode-locking, not passive mode-locking, dominates ultrashort pulse generation in two-section quantum dot and quantum well lasers. Pure self-mode-locking yielded shorter pulses and frequency tunability.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Ultrafast Optics

    Background:

    • Two-section laser diodes commonly use a gain section and a saturable absorber section for ultrashort pulse generation.
    • Passive mode-locking is the typical explanation for pulse generation in such configurations.

    Purpose of the Study:

    • To investigate the dominant mechanism for ultrashort pulse generation in InAs/InP quantum dot and InGaAsP/InP quantum well lasers.
    • To compare pulse characteristics generated via self-mode-locking versus passive mode-locking.
    • To explore repetition frequency tunability in self-mode-locking operation.

    Main Methods:

    • Experimental setup involving two-section laser diodes (quantum dot and quantum well).
    • Comparison of pulse generation under passive mode-locking (gain current + reverse bias) and pure self-mode-locking (gain current only) conditions.
    • Analysis of pulse duration and repetition frequency.

    Main Results:

    • Self-mode-locking was identified as the dominant process for ultrashort pulse generation, outperforming passive mode-locking in terms of pulse duration.
    • The quantum dot laser showed minimal impact from reverse voltage, while the quantum well laser's pulse generation was hindered at higher reverse voltages.
    • Repetition frequency tunability was demonstrated: 47 MHz for the quantum dot laser and 86 MHz for the quantum well laser under pure self-mode-locking.

    Conclusions:

    • Self-mode-locking is a crucial, often dominant, mechanism in two-section laser diodes for generating ultrashort pulses.
    • Pure self-mode-locking offers advantages in pulse duration and enables frequency tuning.
    • Understanding these mechanisms is vital for optimizing laser diode performance in ultrafast applications.