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Multichannel laser diode to polymer waveguide array coupling with a double-aspheric lens.

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    A new optical system efficiently couples laser arrays to polymer waveguide probes using a single lens. This technology is a prototype for preclinical evaluation of optical neural stimulators.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Engineering
    • Materials Science

    Background:

    • Multichannel optical coupling is crucial for advanced applications like optical neural stimulation.
    • Existing coupling methods can be complex and inefficient, limiting device miniaturization and performance.
    • Developing integrated optical systems for neural interfaces requires precise light delivery and signal transmission.

    Purpose of the Study:

    • To develop and characterize an optical system for efficient multichannel coupling of laser arrays to polymer waveguide probes.
    • To achieve high-fidelity optical coupling with minimal crosstalk for potential use in optical neural stimulators.
    • To demonstrate the feasibility of integrating laser sources with flexible polymer waveguide arrays for biomedical applications.

    Main Methods:

    • Design and fabrication of a compact cylindrical optical coupling module using an aspheric lens.
    • Characterization of coupling efficiency and crosstalk for an eight-channel system.
    • Utilizing polymer waveguide technology with SU-8 core and PMMA cladding, featuring tapered lateral pitch.
    • Testing the system with a waveguide array having 100 µm lateral facet pitch at the incoupling site.

    Main Results:

    • Achieved specific coupling with crosstalk below -13 dB for each of the eight optical channels.
    • Demonstrated quasi-uniform coupling efficiency across all channels.
    • Successfully integrated laser arrays with a polymer waveguide array featuring a tapered pitch (100 µm to 25 µm).
    • The developed module (13 mm diameter, 20 mm length) proved effective for multichannel light delivery.

    Conclusions:

    • The developed optical system provides an efficient and compact solution for multichannel laser-to-waveguide coupling.
    • This technology serves as a viable prototype for preclinical evaluation of optical neural stimulators.
    • The demonstrated coupling performance and waveguide integration pave the way for advanced optogenetic and neural interface devices.