gallium selenide (GaSe) crystal / non-linear optical / laser
gallium selenide (GaSe)
Transparency range 650-18000nm
Nonlinear coefficients d22 = 54 pm/V
Orientation accuracy of cut angle 30MW/cm2 for 10ns pulses @ 1064 nm
GaSe has been successfully used for:
efficient SHG of CO 2 laser (up to 9% conversion);
for SHG of pulsed CO, CO2 and chemical DF-laser (l = 2.36 mkm) radiation;
upconversion of CO and CO2 laser radiation into the visible range; infrared pulses generation via difference frequency mixing of Neodymium and infrared dye laser or (F-)-centre laser pulses;
OPG light generation within 3.5 - 18 mkm.
It is impossibile to cut crystals for certain phase matching angles because of material structure (cleave along (001) plane) limiting areas of applications.