Accession Number : ADA290683

Title :   Femtosecond Laser Pulse Diagnostics.

Descriptive Note : Interim rept. 29 Oct-1 Nov 92,

Corporate Author : KRUG LIFE SCIENCES SAN ANTONIO TX SAN ANTONIO DIV

Personal Author(s) : Cain, Clarence P. ; Roach, W. P.

PDF Url : ADA290683

Report Date : NOV 1992

Pagination or Media Count : 3

Abstract : Special instrumentation is required to measure and analyze laser pulses below one nanosecond because of the limitations of standard instrumentation used to measure real-time signals. We have designed and developed an instrument with unique features to measure the pulsewidth of single laser pulses below one nanosecond using the standard autocorrelation technique. A single laser pulse is divided into two equal pulses by a 50/50 beamsplitter and recombined in space and in time inside a wafer of KDP crystal which generates a second harmonic of each fundamental pulse and a second harmonic of the combined pulses. These three pulses are then focused on a charge-coupled device (CCD) camera and analyzed by a laser beam analyzer to yield information on the FWHM (full-width-half-maximum) time of the original pulse. By using a CCD camera the full two-dimensional image can be recorded to insure that the correct horizontal profile is analyzed within the vertical profile. The delay for overlapping the beams in time is obtained by translating the beamsplitter while the positioning is obtained by rotating the beamsplitter. The design and results are discussed.

Descriptors :   *LASER BEAMS, *LIGHT PULSES, *PULSE ANALYZERS, REPRINTS, MEASUREMENT, METHODOLOGY, REAL TIME, TWO DIMENSIONAL, SECOND HARMONIC GENERATION, AUTOCORRELATION, OPTICAL IMAGES, PULSED LASERS, LIMITATIONS, INSTRUMENTATION, SHORT PULSES, CHARGE COUPLED DEVICES.

Subject Categories : Optics
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE