Atomic and Molecular Beams pp 405-412 | Cite as
Femtosecond Pump-Probe Experiments with a High Repetition Rate Molecular Beam
Abstract
This paper describes the first results in the field of femto chemistry obtained by our group at the VUA. A high repetition rate (1 KHz) molecular beam machine and laser system have been used. The laser system was supplied by Spectra Physics and consists of a chirped amplified titanium sapphire system. Its source, formed by a titanium sapphire oscillator (Tsunami) produces 70 fs pulses with a repetition rate of 82 MHz and an energy of approximately 10 nJ per pulse. The output is tunable between 760 nm and 820 nm. A homebuilt autocorrelator was used to determine the pulse duration of the oscillator. The autocorrelator is based on a Michelson-type interferometer with a Hamamatsu photodiode as detector[1]. The semi conductor detector has a bandgap exceeding the energy of one photon of 800 nm, so a two photon process is needed to generate a signal. The measured pulse duration of 70 fs (FWHM) shown in Fig.1 is in agreement with the specified value of the Tsunami.
Keywords
Molecular Beam Probe Pulse Semi Conductor Detector Optical Parametric Amplifier Oscillator PulsePreview
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