Accession Number : ADP008294

Title :   Photon Echo Decay and Optical Storage in Pr Doped YAIO3,

Corporate Author : LUND INST OF TECH (SWEDEN)

Personal Author(s) : Kroll, Stefan ; Kachru, Ravinder

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Homogeneous dephasing processes and optical storage in Pr doped YA1O3 crystals have been examined using photon echoes produced by gated continuous wave laser excitation. The two-pulse photon echo decay time of the 3 H4 - 1 D2 transition in 0.1% Pr3+:YA103 has been measured as a function of excitation pulse energy. The excitation energy dependence of the decay time is essentially the same for the first and the second pulse in the excitation sequence. This is different from the behaviour recently observed in Eu3+:Y2O3 and Tb3+:LiYF4, where mainly the second pulse intensity affected the two-pulse photon echo decay time. By frequency chirping write and read pulses, photon echo data storage and recall of about 50 bits at a single location have been performed using a continuous wave dye laser and a copropagating geometry for the excitation beams. Single-shot storage and recall was performed with very good signal-to-noise ratio. The bit rate in the data sequence was approx. 20 MHz. The decay rate and storage experiments are separately described below.

Descriptors :   *ECHOES, *OPTICAL STORAGE, *PHOTONS, CONTINUOUS WAVE LASERS, CONTINUOUS WAVES, CRYSTALS, DECAY, DYE LASERS, DYES, ENERGY, EXCITATION, FREQUENCY, FUNCTIONS, GEOMETRY, INTENSITY, LASERS, NOISE, PULSES, RATES, RATIOS, RECALL, SEQUENCES, SIGNAL TO NOISE RATIO, SIGNALS, STORAGE, TIME, TRANSITIONS, EUROPIUM, TERBIUM, LITHIUM, HYDROGEN, DEUTERIUM, ACOUSTOOPTICS, OPTICS.

Subject Categories : Acoustics
      Nuclear Physics & Elementary Particle Physics
      Optics
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE