Abstract

We have collected reflectance spectra of various unprocessed rock samples in the 450–1650 nm wavelength range with a spatial resolution of 60 and 120 μm (diameter) and using three illumination modes. Spectra taken in diffuse reflectance (dark field) mode are comparable to those obtained from macroscopic measurements and can provide the basis for mineral detection at that spatial scale. The spectral discrimination of the dark field mode is demonstrated to be consistent with the spatial resolution of the microscope for the samples examined. These results support the conclusion that reflectance microspectroscopy in the visible and near-infrared regions can be a valuable tool for understanding mineral formation at the spatial scale of tens of micrometers.

Remote Raman spectroscopy of natural rocks

Genesis Berlanga, Tayro E. Acosta-Maeda, Shiv K. Sharma, John N. Porter, Przemyslaw Dera, Hannah Shelton, G. Jeffrey Taylor, and Anupam K. Misra
Appl. Opt. 58(32) 8971-8980 (2019)

Diffraction limited mid-infrared reflectance microspectroscopy with a supercontinuum laser

Jakob Kilgus, Gregor Langer, Kristina Duswald, Robert Zimmerleiter, Ivan Zorin, Thomas Berer, and Markus Brandstetter
Opt. Express 26(23) 30644-30654 (2018)

Measurement of the Infrared Spectral Reflection of Some Common Minerals and Rocks Using Multiple-Scan Interferometry

M. J. D. Low
Appl. Opt. 6(9) 1503-1506 (1967)

Nature of light scattering in dental enamel and dentin at visible and near-infrared wavelengths

Daniel Fried, Richard E. Glena, John D. B. Featherstone, and Wolf Seka
Appl. Opt. 34(7) 1278-1285 (1995)

Bidirectional Reflectance Measurements for Satellite Calibration Target in the Visible and Near Infrared

F. Saiedy and G. D. Jones
Appl. Opt. 7(3) 429-434 (1968)