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      https://www.ias.ac.in/article/fulltext/pram/059/01/0075-0089

    • Keywords

       

      Thermal lens; diode pumping; mode degeneracy; Q-switching; AO modulator; Nd; YVO4 crystal

    • Abstract

       

      The effect of Nd3+ concentration on the CW and Q-switched laser performances at 1064 nm from Nd: YVO4 has been studied under diode laser pumping in identical laser configuration. The Nd3+ concentrations used were 1, 2 and 3 at.% in YVO4 crystals. Under the CW operations we have compared the thermal lensing effect, slope efficiencies and also the beam quality at the fourth-order degeneracy configuration. Q-switching was done with the help of an acousto-optic modulator and we have compared the pulses obtained from Nd: YVO4 laser with different doping concentration. It was found that the 1 at.%-doped crystal is the best, offering highest optical-to-optical conversion efficiency (55%), lowest fractional heat load (24%), highest pulse energy (80 µJ) and shortest pulse width (20 ns). It was also found that there was not much difference in performances for 2 and 3 at.%-doped crystals both in CW and Q-switched configurations.

    • Author Affiliations

       

      Pranab K Mukhopadhyay1 K Ranganathan1 Jogy George1 SK Sharma1 TPS Nathan1

      1. Diode Pumped Solid State Laser Group, Center for Advanced Technology, Indore - 452 013, India
    • Dates

       
  • Pramana – Journal of Physics | News

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