Fluorescence-encoded Raman spectroscopy has become increasingly more popular by virtue of its high chemical specificity and sensitivity. However, current fluorescence-encoding methods are narrowband and lack sensitivity in the low wavenumber region which if addressed could further enhance these methods. To overcome these limitations, we propose and experimentally demonstrate a novel broadband method for fluorescence-encoded Raman spectroscopy, termed fluorescence-encoded time-domain coherent Raman spectroscopy (FLETCHERS), which is capable of probing molecular vibrations in the lower fingerprint region (200 – 750 cm-1 ) with sample concentrations as dilute as 100 nM and laser powers as low as 20 mW.
An imaging lidar system is presented which combines the high speed of a Digital Micromirror Device (DMD) and the higher range of a 1D collimated scanning output. The system employing 1D line object illumination along with DMD placed at focal plane enables flexible optimization of system metrics, such as field of view, angular resolution, maximum range distance and frame rate.
The ray formalism is critical to understanding light propagation, yet current pedagogy relies on inadequate 2D representations. We present a system in which real light rays are visualized through an optical system by using a collimated laser bundle of light and a fog chamber. Implementation for remote and immersive access is enabled by leveraging a commercially available 3D viewer and gesture-based remote controlling of the tool via bi-directional communication over the Internet.