A Bragg mirror allows reflection within a narrow range of wavelengths (< 1 nm) based on the use of 1D photonic crystals with a very narrow bandgap. This is done for example by writing in (with a laser) a very low index contrast into a photorefractive piece of glass.
Vendor: Coherent
Model: 114-ER215-001
Diffraction efficiency: >99.5%
FWHM: 180pm
Price: $795
Purchase Date: May 2021 by Nicholas Rivera