Micro-sized tunable liquid crystal optical filters
C Stoltzfus, R Barbour, D Atherton, Z Barber – arXiv preprint arXiv:1705.00983, 2017 Abstract Liquid Crystal Arrayed Microcavities (LCAM) is a new technology for ultra-narrow optical filtering (FWHM ~ 0.1 nm) that uses pico-liter volume Fabry-Perot type optical...What is a Stray Light?
Stray light is any light that hits the detector unintentionally. The detector is not able to distinguish wavelengths, so it cannot tell the difference between the e.g. 500 nm light that is supposed to hit a pixel and the 505 nm light that accidentally hit it. It will...What is a spectrometers F-number?
The f-number, also called the f-stop or the f-ratio, is an optical component’s focal length divided by its diameter: where N is the f-number, ƒ is the focal length, and D is the diameter. Often, this is written as “f/N,” so for N=4, it is written “f/4.” This number...What is a spectrometer’s grating efficiency curve?
A grating efficiency curve shows how efficient a grating is at diffracting light at each wavelength. Below is a grating efficiency curve for the VIS BLUE-Wave spectrometer model: Absolute efficiency (%) is plotted versus wavelength. At 500 nm, the efficiency is ~75%....What is a dual blaze spectrometer grating?
A dual blaze grating is a grating with two blaze wavelengths. The SILVER-Nova Super Range spectrometer has a composite grating with a dual blaze at 250 and 1000 nm, giving it a wavelength range of 190-1110 nm. This can be seen in the grating efficiency curve: View...
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