“ORPHEUS-N” is a non-collinear optical parametric amplifier (NOPA) pumped by the “PHAROS” laser system. Depending on the “ORPHEUS-N” model, it has a built in second or third harmonic generator providing 515nm or 343nm as pump for the NOPA.
“ORPHEUS-N” with second harmonic pump (“ORPHEUS-N-2H”) delivers pulses of less than 25fs in 650-850nm range with average power of more than 0.5W at 650nm (pumped at 6W @1030nm, 200kHz). “ORPHEUS-N” with third harmonic pump (“ORPHEUS-N-3H”) delivers pulses of less than 35 fs in 500-650nm range with average power of more than 0.2W at 550nm*.
“ORPHEUS-N” works at repetition rates of up to 600 kHz. The device is equipped with computer controlled stepping motor stages, allowing automatic tuning of the output wavelength. An optional signal second harmonic generator is available extending the tuning range down to 250-450 nm.
“ORPHEUS-N” is an invaluable instrument for time-resolved spectroscopy. Several “ORPHEUS-N” systems can be pumped with a single “PHAROS” providing at least two pump/probe channels with independent wavelength tuning.
The principle of operation of “ORPHEUS-N” is based on non-collinear parametric amplification of white-light continuum in a nonlinear crystal. A two stage non-collinear amplification scheme is used. The non-collinear amplifier is pumped by the 2nd or 3rd harmonic of “Pharos” produced by built-in harmonics generator. A small fraction of the incoming 1030 nm pulse is used to produce white-light continuum. After amplification, signal pulses are compressed using a pair of fused silica prisms. The output bandwidth is controlled by adjusting the amount of dispersive material in the white-light path before amplification.