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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Organic nonlinear optical dyes offer unique photophysical properties.
    • Lasing phenomena like random lasing (RL) and distributed feedback (DFB) are crucial for advanced optical devices.

    Purpose of the Study:

    • To demonstrate random lasing (RL) and distributed feedback (DFB) lasing in a DCNP-PMMA system.
    • To investigate the tunability of DFB lasing emission.

    Main Methods:

    • Dispersing luminescent 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP) dye in a poly(methyl methacrylate) (PMMA) matrix.
    • Utilizing spontaneously formed DCNP micro-/nano-crystals for RL.
    • Employing degenerated two-wave mixing for DFB lasing with tunable interference patterns.

    Main Results:

    • Successful realization of both RL and DFB lasing in the DCNP-PMMA composite.
    • Achieved real-time, reversible tuning of DFB lasing emission by altering the angle of pumping beams.
    • Demonstrated a wide tuning range of approximately 65 nm due to DCNP's dual emission bands.

    Conclusions:

    • The DCNP-PMMA system is a promising platform for developing tunable laser sources.
    • The method provides a versatile approach for controlling lasing emission in organic materials.