Accession Number : ADD000040

Title :   Pulsed Coherence Length Measurement Device.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Patten,Raymond A ; Blodgett,Jerry A

Report Date : 09 Oct 1973

Pagination or Media Count : 7

Abstract : The patent discoses a method for measuring the coherence length of laser light using only a single laser pulse. The light from a single laser pulse is divided into two beams which are then projected at the same angle theta (measured from the normal) onto the same areas on a photographic film to form interference fringes. The film is then developed, placed on a translating platform and passed through the beam of a CW laser, a portion of the beam being diffracted by the interference fringes recorded on the film. The distance, W, between points on the same interference region which are one-quarter of the highest intensity in that region, is measured and the coherence length is calculated.

Descriptors :   *Laser beams, *Light pulses, *Optical instruments, *Patents, Holography, Interferometry, Measuring instruments, Coherent radiation

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE