Abstract

A fully synchronous five-decade ECL counter is described, operable to beyond 75 MHz and producing two distinct TTL-level outputs separated by presettable N+1 and M+1 input pulses. Intended primarily for laser pulse studies, the counter allows precise Q-switch–mode-lock synchronization, yielding greater optical pulse stability than with a- or semisynchronous synchronizer designs. In addition, the dual modulo feature allows easy selection of one particular optical pulse in the Q-switched output train for close study.

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