Polarizing cube beamsplitters divide unpolarized light into two orthogonally polarized beams at 90° to each other. The transmitted beam is mostly polarized parallel to the plane of incidence (p-polarized), and the reflected beam is mostly polarized perpendicular to the plane of incidence (s-polarized

Plate beamsplitters are semi-mirrors, which reflect part of the incident energy (absorb a relatively small part) and transmit the rest. Some are neutral and some are spectrally selective.

Hot mirrors and cold mirrors are dichroic filters that have a sharp transition between rejecting and transmitting at the near-infrared-visible area of the spectrum.

Iris apertures are used to manually vary the intensity of light, and the angle of incidence, of a cone of light

Laser mirrors are designed for high reflectance and durability at individual laser wavelength ranges.

Measurement microphones are most commonly condenser microphones, which convert sound pressure to an output that is then converted into a reading such as sound pressure level (SPL).

Waveplates and retardation plates are optical elements with two principal axes, one slow and one fast, which resolve an incident polarized beam into two mutually perpendicular polarized beams. The emerging beam recombines to form

Pellicle beamsplitters are constructed from thin, nitrocellulose films that are stretched and cemented to rigid supporting rings. They are very delicate and liable to resonate to certain vibration frequencies. 

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.

Raman spectrometers are used to measure the wavelength and intensity of inelastically scattered light from molecules. They can determine the chemical composition of a sample based on its wavelength and intensity.

Cleanroom equipment includes furniture, tools and other equipment for use in clean rooms.

Mirror Assemblies are composed of a single or several mirrors mounted for a particular function.