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Schematic diagram of a typical laser, showing the three major parts. A laser is constructed from three principal parts: An energy source (usually referred to as the pump or pump source), A gain medium or laser medium, and; Two or more mirrors that form an optical resonator.
Laser sights may be attached to the existing sighting mechanism, the trigger guard, via a rail system, or can be integrated into replacement components such as the guide rod or grip plates. [ 5 ] [ 6 ] [ 7 ] Some variants are also incorporated into other attachments such as foregrips .
The sight is mil-spec and projects a visible red dot. The unit is the Carbine Visible Laser or CVL version of the larger AN-PEQ-2, and is found in the SOPMOD Block I kit for use by the U.S. military. The unit comprises a single rugged box that houses a visible red laser, which mounts to a weapon using a MIL-STD-1913 rail.
On weapons, these sights are usually formed by rugged metal parts, giving them the name "iron sights", [4] as distinct from optical or computing sights. [5] On many types of weapons they are built-in and may be fixed, adjustable, or marked for elevation , windage , target speed, etc. [ 3 ] They are also classified in forms of notch (open sight ...
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser originated as an acronym for light amplification by stimulated emission of radiation.
Types of two-mirror optical cavities, with mirrors of various curvatures, showing the radiation pattern inside each cavity. Light confined in a resonator will reflect multiple times from the mirrors, and due to the effects of interference, only certain patterns and frequencies of radiation will be sustained by the resonator, with the others being suppressed by destructive interference.
The sight can be adjusted for range and windage by simply tilting or pivoting the holographic grating. [4] To compensate for any change in the laser wavelength due to temperature, the sight employs a holography grating that disperses the laser light by an equal amount but in the opposite direction as the hologram forming the aiming reticle.
Most types of laser are an inherently pure source of light; they emit near-monochromatic light with a very well defined range of wavelengths.By careful design of the laser components, the purity of the laser light (measured as the "linewidth") can be improved more than the purity of any other light source.