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8,726 terms

Photonics Dictionary

lens disc

A rotating disc that holds several lenses of differing focal length about a diameter. Used to switch lenses in a system while maintaining focus.

lens element

One optical element of a multielement lens. See optical element.

lens measure

A tool used to determine the curvature of a lens surface in terms of dioptric power. See lens watch; spherometer.

lens meridian

A line passing through the center of a lens surface, from edge to edge.

lens molding

The production of rough glass lens blanks that are pressed while red-hot to the approximate size and shape of the finished lens, ready for fine grinding and polishing. Large companies often do their...

lens mount

The metal tube that maintains the optical components of a lens in proper relationship. Some lenses are mounted in metal cells, which in turn are screwed to the front and rear of a shutter or lens...

lens speed

Also known as f number, lens speed is commonly represented as the ratio of the focal length to the diameter of the lens. Lower f numbers produce brighter images.

lens system

Two or more lenses arranged to act in conjunction with one another.

lens testing equipment

Lens testing equipment refers to a range of specialized tools and instruments used to evaluate the optical performance, quality, and characteristics of lenses. These instruments are essential for...

lens transmission

The ratio of the intensities of a light bundle before and after passing through the lens.

lens watch

A dial depth gauge graduated in diopters; a lens measure.

lens

A lens is a transparent optical device that focuses or diverges light, allowing it to pass through and form an image. Lenses are commonly used in optical systems, such as cameras, telescopes,...

lensless Fourier transform hologram

A hologram formed without lenses and with the object and reference points sharing the same plane. In the initial recording, each object point produces fringes having one spatial frequency across the...

lensless microscopy

Lensless microscopy, also known as computational or holographic microscopy, is an imaging technique that captures and reconstructs microscopic images without the use of traditional lenses. Instead of...

lenslets

A matrix of miniature lenses, molded or formed onto a common base.

lensometer

An ophthalmic instrument used to measure the magnitude and direction of the maximum and minimum powers of a spectacle lens, and mark the optical center of the lens by an ink dot. When the lens to be...

lenticular

An array or mosaic of optical surfaces. May be a number of lenses closely packed to form multiple images or many parallel cylinders used as a projection screen.

lenticular color photography

A type of additive color photography using a lenticular structure impressed on a film base and a camera lens with a filter having three sectors of red, blue and green. Exposure of the film through...

lenticular image dissection

A method of image dissection whereby a lens transfers images onto a lenticular plate that in turn illustrates the images as structures of narrow parallel lines.

lenticular screen

A rear or front projection screen composed of minute optical surfaces that introduce a spread to the light beam that conforms approximately to the light distribution requirements of the application.

lenticular stereo photography

A type of stereoscopic photography in which a pair of lenses focuses a pair of images, relative to the positions of the two eyes, onto film through a lenticular screen, which records the images as an...

lenticular stereogram

The stereo image that is recorded by the lenticular, stereo photographic process.

LEO

low earth orbit

LEOS

Lasers & Electro-Optics Society (of IEEE)

lepton

The generic term describing the class of light particles having no strong interactions.

LET

linear energy transfer

leukocyte

Leukocytes, commonly known as white blood cells, are a crucial component of the immune system in vertebrates, including humans. These cells are responsible for defending the body against infections...

levorotary

Characterizes a substance whose plane of polarization is rotated counterclockwise as the observer looks through the material toward the light source. The rotation is negative.

low frequency

LFBR

laser fusion breeder reactor

LFM

laser feedback microscope; lateral force microscope; longitudinal field modulator

LFO

low-frequency oscillator

LFOS

ladar fiber optic sensor

LGP

light-gun pulse generator

LGWS

laser-guided weapons system

LHCP

left-hand circular polarization

LIA

Laser Institute of America

LIBORS

laser ionization based on resonance saturation

LIBS

laser-induced breakdown spectroscopy

LICAP

laser-induced cut and patch

LID

linear imaging device; laser injection diode; local injection detection

lidar

light detection and ranging

lidar

Lidar, short for light detection and ranging, is a remote sensing technology that uses laser light to measure distances and generate precise, three-dimensional information about the shape and...

LIDT

laser-induced damage testing

Lieberkuhn illumination -> oblique illumination

A common technique in microscopy, oblique illumination is one in which the object is illuminated by a light source that is at an oblique angle (on the side) to the optical axis. This technique is...

Liebmann effect

The visual perception of contrasting forms is more difficult if the forms have the same luminance but different chromaticities, than if the forms have the same chromaticity but different luminances.

LIFS

laser-induced fluorescence spectroscopy

light

Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which...

light adaptation

The ability of the human eye to adjust itself to an alteration in the intensity of light.

light amplifier

A device that serves to emit light of the same wavelength as the input light, only with an increase in intensity. It may be a solid-state device comprising photoconductive and luminescent layers...

Photonics Dictionary

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