Abstract
Mid-infrared (mid-IR) imaging and spectroscopic techniques have been rapidly evolving in recent years, primarily due to a multitude of application within diverse fields like biomedical imaging, chemical sensing and cancer diagnostics [1]. Most complex chemicals have unique spectral signatures in the mid-IR region, facilitating unambiguous identification based on their absorption features. Owing to the limitations of conventional detectors in the mid-IR spectral range, sum frequency generation (SFG) in a second order nonlinear crystal can be used to convert the mid-IR signal to the visible/near-IR, enabling easy detection using silicon-based detectors. Ultrashort-pulsed upconversion is of particular interest for performing pump-probe experiments and studies of fast relaxation dynamics of chemicals and molecules [2].
© 2019 IEEE
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