The Brilliant series of Nd:YAG oscillators from Quantel features exceptional beam quality, pointing stability, energy stability and timing jitter properties. This makes them ideally suited to PIV applications where uniform illumination of a flow field, with accurate timing, will lead to the best measurement results.
These key laser performance features are the result of the unique design of the Brilliant oscillator, from the pump chamber and the thermally stabilised resonator to the carefully engineered power supply and cooling system.
To make a Twins system, two independent Brilliant oscillators are mounted together securely on a very rigid "U" section optical bench with the beam-combining unit, which house combining optics, a thermally stabilised harmonic generation assembly, and dichroic separation optics. The resulting unit has great mechanical stability, allowing full benefit to be taken from the laser's exceptional pointing accuracy.
The Twins laser system is compact enough to be transported easily to allow off-site measurements to be carried out. The user-friendly character of Twins is enhanced by freedom from any external water source. For those who work in hot air environment the Twins B can be delivered with a water-to-water exchanger. Second harmonic generation uses a type II KD*P crystal after combining the infrared beams in a polariser. The two collinear output pulses have the same plane of polarisation.
As an option, two SHG units may be used, with subsequent combination of two green beams, with output pulses with orthogonal polarisation. In each case, the residual infrared radiation is separated by dichroic mirrors and safely dumped inside the unit.