RECENT DRDO DEVELOPMENTS
Diode Array Pumped Nd : YAG Laser
The Laser Science & Technology Centre (LASTEC) , Delhi, has successfully developed the state-of-the-art Diode Pumped Solid-State Laser (DPSSL) Technology as a part of DRDO Photonics Programme. The solid-state lasers are conventionally pumped by noble gas (Xenon or Krypto) filled flash lamps or arc lamps. These lamps produce broad raDIATion from ultraviolet to infrared, but only a very small portion of this wide band raDIATion is used by the absorbing active element. Consequently, the electrical efficiency of the system is extremely poor, typically of the order of 1 per cent. The diode laser pump source for solid-state lasers brings the advantages of high efficiency, long operation life and high spectral brightness by selectively pumping the absorption bands of the ion-doped crystal and glasses. It also reduces the size, weight, power consumption and waste heat dissipation, hence resulting in compact and efficient systems suitable for military applications.
demonstrated various bench models of diode array pumped Nd: YAG laser. The figure shows