Abstract
Nanosecond laser pulses (6ns FWHM, produced by a Q-switched, frequency-doubled Nd:YAG laser) are chopped using the inverse-Bremsstrahlung (IB) photon absorption process in a cell with variable pressure. The IB process that quickly absorbs the majority of the laser pulse energy is triggered by focusing the pulse in the cell. Prior to the initiation of the IB process, the gaseous medium in the cell is transparent, while it suddenly becomes opaque with the IB process activated; therefore, the pressure cell can be used as a virtual optical shutter. The shutter "closing time" depends strongly on the pressure of the cell and the laser pulse energy and thus can be controlled. Dependence of the "closing time" on these two parameters is experimentally investigated.
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