Photonics Dictionary: D

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deblocking

The removal of optical elements from a block.

Debot effect

The conversion of an internal latent image into a surface latent image through exposure to infrared radiation. The converse of the Herschel effect.

Debye effect

The selective absorption of electromagnetic waves by a liquid made up of molecules with permanent dipole movement.

Debye-Scherrer-Hull method -> x-ray analysis

The series of processes used to identify and evaluate crystal structure by using crystalline solids to diffract x-rays. In the Laue method, radiation of a wide range of wavelengths is transmitted by...

Debye-Sears ultrasonic cell

A device used in ultrasonic imaging to measure the velocity and attenuation of compressional waves in a transparent liquid by virtue of acoustic waves set up in the liquid. The wavefronts serve as a...

dark-field microscopy

A technique whereby the sample is illuminated by a hollow cone of light larger than the acceptance angle of the objective, so that only scattered light is seen, revealing any irregularities of the...

differential interferometer

A device that produces an interferogram that can be directly related to the temperature gradient and thereby provides a direct measure of the convective heat transfer coefficients.

diffraction limited

The property of an optical system whereby only the effects of diffraction determine the quality of the image it produces.

double-pulsed holography

Holographic recording whereby the object is illuminated by two pulses, separated by a time interval, from a Q-switched laser source. Each pulse is divided into reference and object beams, and...

dropping

The process whereby a blank or disc is heated to a sufficiently high temperature to sag into a mold having a desired curvature.

dye transfer method

The subtractive imbibing process of transferring color prints on paper whereby the dyes from three separately prepared images are transferred to one sheet of paper to form the color print.

Photonics DictionaryD

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