New Development

Diode Pumped Solid State Green Microchip Laser

Laser Science & Technology Centre (LASTEC), Delhi, has developed bench model of a Diode Pumped Solid State Green Microchip Laser. These lasers are perhaps the ultimate in miniaturisation of diode pumped lasers with extremely high spatial profile and single longitudinal mode and ultra short pulse durations. The laser technology for generation of tens of milliwatts to hundreds of milliwatts of CW power in red, green and blue region, is being widely explored all over the world.

A hybrid diode pumped microchip (DPM) crystal having Nd:YVO4 (2x2x0.5) mm and KTP (2x2x2)mm joined together has been used with suitable dielectric mirror coatings directly deposited on end faces. Output from a CW laser diode, generating ~700 mW @ 808 nm, is coupled through a gradient index (GRIN) lens. The diode operates with 5V DC supply and has an in-built laser diode driver. Initially, a highly stable output with 25mW @ 532nm has been achieved. Optimisation of the coupling optics and package design is in progress.

Microchip lasers find applications not only in industrial and scientific fields but can also lead to ultra-compact and powerful lasers for defence applications.