NOPA or OPA?
Ultrshort light pulses with easily tunned wavelength? This requirement can be fullfield by Optical Parametrical Amplifiers. In non-collinear arrangement these can generat pulses with broad spectra.
Which is better collinear or non-collinear configuration? Well, for small energies and tightly foccused beams the answer to this question is far from obvious. Fortunately Hussar solved this puzzle. An unusual construction of the parametric amplifier has been created in our lab.