Optical bandpass filters are designed to transmit a specific waveband.  They are composed of many thin layers of dielectric materials, which have differing refractive indices to produce constructive and destructive interference in the transmitted light

Camera filters provide a range of optical filtering effects in scientific, research, and industrial applications

Spectral filters are used to selectively transmit light according to its wavelength. They are not to be mistaken with color filters, which can be differentiated by an associated schott glass number

Long pass filters transmit a wide spectral band of long wavelength radiation while blocking short wavelength radiation. Short pass filters transmit a wide spectral band of short wavelength radiation and block long wave radiation

Fiber optic filters allow only specific wavelengths to pass into a larger fiber optic system

Color filters include a wide range of filter types that are distinguished by their specific color spectrums and wavelengths, as well as their Schott glass compositions

Interferometers measure distance in terms of wavelength and determine the wavelengths of light sources.

Monochromators are optical subassemblies used to isolate narrow portions of a light spectrum. They accept polychromatic input from a lamp or laser, and outputs monochromatic light

Frequency converters and translators scale and/or filter frequency inputs to produce outputs signals with frequencies that are a function of the inputs

Signal converters contain inputs for one type of signal and outputs of another. Features can also include filtering and amplification or attenuation

Charge converters and charge amplifiers convert the charge output from a piezoelectric, capacitive or other charge-producing sensor to a signal such as analog voltage or current.

Spectral lamps radiate line spectra of various gases and metal vapors with high brightness and spectral purity.

RF filters and microwave filters are devices that pass or reject signals by frequency. Basic types include bandpass filters, band reject filters, low pass filters, and high pass filters

Signal filters block or decrease (attenuate) unwanted frequencies or signal wave characteristics

Active band pass filters are used to attenuate frequencies below and above a range of frequencies (i.e., the bandwidth or passband of the filter