APPLICATION FOCUS: ULTRAFAST AMPLIFIER SYNCHRONIZATION

In techniques where two ultrafast amplifiers are necessary to perform an experiment, the amplifiers are often required to be synchronized with each other. Quantronix has recently developed new ultrafast amplifier control electronics that enable synchronization of the amplifiers as well as the capability to run the amplifiers at different repetition rates while delaying one amplifier pulse with respect to the other. These features allow researchers to use this synchronized amplifier scheme in time-domain spectroscopy experiments that require temporal delays between pulses that exceed the realistic use of a mechanical delay stage.

In a typical synchronized amplifier setup, a single Quantronix Ti:Sapphire oscillator seeds two amplifiers (see the image below). Each amplifier's repetition rate is selected by a pulse divider that down-counts the trigger signal provided by the oscillator. The down-counted signal sets the repetition rate through pump laser triggering and control of the two amplifiers' Pockels cell timing. An offset delay applied to the timing signals of the 2nd amplifier allows a different oscillator pulse to be amplified. The two amplifiers have matched path lengths and regenerative amplifier round trips, and the pulse jitter between the two amplifiers is <50 fs. When both amplifiers are running at 1 kHz, this setup allows synchronized pulses with temporal delays of up to 1 ms in 13.1 ns increments.

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