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Doped AunX+ clustersOptical Parametric Oscillator
The Optical Parametric Oscillator (Spectra Physics, Quanta Ray
MOPO-730) is a tunable laser system used for excitation and/or ionization
of cluster species. The operation
principle of an OPO is fundamentally different from that of a true laser.
Whereas the output of a laser stems from spontaneous and stimulated
emission, the output of an
OPO is based on the nonlinear frequency conversion of an intense laser wave in a BBO (Beta Barium Borate).
In the MOPO system, the pump wavelength is always 355 nm (third
harmonic output of a Nd:YAG-laser, Spectra Physics, Quanta Ray GCR-
230, 440 mJ pp). Selection of a specific set of signal and idler
wave is possible because of the angular dependence of the birefringence
of the BBO crystal.
The tunability range of signal and idler beam in the MOPO-730
carries from 410 to 690 nm and from 730 to 1800 nm respectively. The
output of an OPO is very similar to that of a laser. Both signal an idler
beam exhibit strong coherence and are highly monochromatic.
Pulse energies of typically about 50 mJ and 20 mJ for signal and idler beam respectively,
can be reached over a broad tuning range.
In order to generate ultraviolet laser light, the MOPO-730 is equipped with a frequency doubling option (Quanta Ray FDO-1). In this module two BBO crystals are used to frequency double the laser light over the whole wavelength range. With this mfor two degeneracy gaps from 355 to 365 nm and from 690 to 730 nm. Typical output pulse energies are 4 mJ for the doubled signal beam and about 1 mJ for the doubled idler beam.odule installed, the wavelength range spans from the ultraviolet to the infrared (220 to 1800 nm), except for two degeneracy gaps from 355 to 365 nm and from 690 to 730 nm. Typical output pulse energies are 4 mJ for the doubled signal beam and about 1 mJ for the doubled idler beam.
