Pulsed Laser Systems

The Pulsed Laser Systems

The laser lab has three commercial pulsed lasers for conducting various experiments in the nanosecond regime. The major source of nanosecond pulses is furnished by a Continuum Q-switched Nd:YAG laser operating at 1064nm with maximum pulse energy of 450mJ at 10Hz repetition rate. Using nonlinear optical crystals, second, fourth and fifth harmonics of these near-infrared pulses can be obtained to conduct experiments requiring 10ns pulses at 532, 266 and 213nm. A nitrogen laser is used to pump a dye laser which is used to output 10ns pulses in a wide frequency range from 450 to 1000nm. Since the pulses energy is much smaller than that of the YAG laser, less than a few mJ, the N2-dye laser system is mainly used as the probe beam for pump-probe experiments.

Research related to the use of pulsed laser systems at BLL include: mechanism study of soft tissue ablation by nanosecond laser pulses from ultraviolet to near-infrared regions; animal model study of tattoo removal in skin; gene transfer study in plant cells with direct illumination and pressure-waves induced by the nanosecond laser pulses.



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