Ramsey J M, Hieftje G M, Haugen G R
Indiana University, Department of Chemistry, Bloomington, Indiana 47405, USA.
Rev Sci Instrum. 1979 Aug;50(8):997-1001. doi: 10.1063/1.1135986.
A new instrument for the analog determination of correlation functions of wide-bandwidth signals is described and characterized. The instrument is comprised of microwave electronic components; a double-balanced mixer performs the multiplication operation involved in the correlation process, whereas a constant-impedance line stretcher introduces the variable delay. Measurements indicate that the correlator has a bandwidth of approximately 3 GHz. It is shown that this inexpensive and simple device can be used as a diagnostic tool for mode-locked argon-ion lasers when used in conjunction with a fast photodiode detector.
