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The near-infrared (NIR) window (also known as optical window or therapeutic window) defines the range of wavelengths from 650 to 1350 nanometre (nm) where light has its maximum depth of penetration in tissue. [1] Within the NIR window, scattering is the most dominant light-tissue interaction, and therefore the propagating light becomes diffused ...
The output of an Er:YAG laser is strongly absorbed by water. As a result, they are widely used for medical procedures in which deep penetration of tissues is not desired.
Based on the premise that fat cells are more easily damaged by cooling than skin cells (such as popsicle panniculitis), cryolipolysis was developed to apply low temperatures to tissue via thermal conduction. [29] In order to avoid frostbite, a specific temperature level and exposure are determined, such as 45 minutes at −10 °C (14 °F).
Researchers compressed infrared light to 10% of its wavelength using a thin strontium titanate film, paving the way for advanced infrared imaging.
Attenuated total reflection (ATR) is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly in the solid or liquid state without further preparation. [1] Light undergoes multiple internal reflections in the crystal of high refractive index, shown in yellow.
The method or technique of infrared spectroscopy is conducted with an instrument called an infrared spectrometer (or spectrophotometer) which produces an infrared spectrum. An IR spectrum can be visualized in a graph of infrared light absorbance (or transmittance ) on the vertical axis vs. frequency , wavenumber or wavelength on the horizontal ...