U1travio1t radiation down to 47nm and infrared radiation upto 3. 4 has been qenerated by second harmonic generation surn+requency mixing and di++rence-- +rquency mixing in a Barium Borate cryutal . The bai c pump 1 aser used I s 1064nm Nd:YAG laser. The other tunable pump source is derived from dye laser. The generation is made by nonco). linear i nteract 1 on. 1.