The Lab. has also initiated experiments on thermal lensing phenomena in the gain medium for characterization of the thermal lens parameters. A novel on-line thermal lens measurement method was developed and used to measure the variation of thermal lens in a microchip laser. Results of these measurements helped us in optimizing the output powers of our green and infrared lasers. These measurements also helped us in quantitatively measuring the mode profile in side the resonator. A simulation programme for intracavity frequency doubled lasers is also developed.
Preliminary results are in excellent agreement with experimentally achieved results.
A Diode pumped NdYVO4 laser has been designed. A Diode pumped NdYVO4 laser with intracavity doubling crystal was developed. . A 5 mm long Type II phase matched KTP crystal was used for frequency doubling. With 2.6 W pump power at 809 nm we were able to achieve 300 mW of IR at 532 nm. Only the absorbed pump power has been taken into account for conversion efficiency.