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Zacherl, W. D.

Paper Title Page
THPMS059 Correlating Pulses from Two Spitfire, 800nm Lasers 3121
  • W. D. Zacherl, E. R. Colby, C. Mcguinness
    SLAC, Menlo Park, California
  • T. Plettner
    Stanford University, Stanford, Califormia
  Funding: Department of Energy contracts DE-AC02-76SF00515, DE-FG03-97ER41043-III

The E163 laser acceleration experiments conducted at SLAC have stringent requirements on the temporal properties of two regeneratively amplified, 800nm, Spitfire laser systems. To determine the magnitude and cause of timing instabilities between the two Ti:Sapphire amplifiers, we pass the two beams through a cross-correlator and focus the combined beam onto a Hamamatsu G1117 photodiode. The photodiode has a bandgap such that single photon processes are suppressed and only the second order, two-photon process produces an observable response. The response is proportional to the square of the intensity. The diode is also useful as a diagnostic to determine the optimal configuration of the compression cavity.

Yoshihiro Takagi et al, 'Multiple- and Single-shot autocorrelator based on two-photon conductivity in semiconductors.' Optics Letters, Vol. 17, No. 9, May 1, 1992.

FRPMS063 Material Effects and Detector Response Corrections for Bunch Length Measurements 4147
  • W. D. Zacherl, I. Blumenfeld, M. J. Hogan, R. Ischebeck
    SLAC, Menlo Park, California
  • C. E. Clayton, P. Muggli, M. Zhou
    UCLA, Los Angeles, California
  Funding: Department of Energy contract DE-AC02-76SF00515

A typical diagnostic used to determine the bunch length of ultra-short electron bunches is the autocorrelation of coherent transition radiation. This technique can produce artificially short bunch length results due to the attenuation of low frequency radiation if corrections for the material properties of the Michelson interferometer and detector response are not made. Measurements were taken using FTIR spectroscopy to determine the absorption spectrum of various materials and the response of a Molectron P1-45 pyroelectric detector. The material absorption data will be presented and limitations on the detector calibration discussed.