High-resolution single photodiode spectrometer using a narrowband optical filter

A method, comprising:

• receiving, by a narrowband optical filter included in an optical device, a beam of light at a selected angle of incidence,
• wherein the beam of light is caused to be received by the narrowband optical filter at the selected angle of incidence by a steering element included in the optical device;
• outputting, by the narrowband optical filter, a filtered beam of light associated with the beam of light,
• wherein a wavelength of the filtered beam of light is governed by the selected angle of incidence;
• and
• receiving, by a photodiode included in the optical device, a portion of the filtered beam of light after the filter beam of light is outputted by the narrowband optical filter.

A spectrometer, comprising:

• a steering element to direct a beam of light such that the beam of light is incident on a narrowband optical filter at a particular angle of incidence;
• the narrowband optical filter to filter the beam of light in order to create filtered beam of light,
• wherein a wavelength of the filtered beam of light depends on the particular angle of incidence;
• and
• a photodiode to receive at least a portion of the filtered beam of light in association with performance of a spectroscopic measurement.