Abstract Electro-optically Q-switched side-pumped diode-pumped KTP/YAG:Nd 3+ nanosecond laser system with an intracavity collinear optical parametric oscillation was proposed as a pump source for Cr 2+ :ZnSe laser. Energy parameters of were investigated respect to the wavelength Under optimal conditions, pumping pulses energy 10.5 mJ and duration 7.2 ns at 1950 nm allowed obtain 3.2 2494 slope ...