Vol. 38, issue 12, article # 12

Abstract:

Imaging in the visible spectrum of processes in media transparent only to IR radiation requires the use of active converters of IR radiation into the visible spectrum. In this work, we simulate the transformation of IR radiation into the visible due to competition between transitions in manganese vapor active media. Our approach is based on the spatio-temporal kinetic model of the active medium. We evaluate the coefficient of the transformation for continuous and pulsed modes an input IR signal for a wide range of its power and various pulse repetition frequencies (from 2 to 20 kHz). We show the pulsed mode and pulse repetition frequency lower than the optimal one in terms of the amplified spontaneous emission power to be optimal for this transformation. The measurable transformation factor is higher than 10 for medium-size GDT. Results confirm than the bistatic scheme of a laser monitor on Mn vapor active media can be used to obtain a negative image of processes in a medium transparent for IR radiation, i.e., to make a pulsed narrowband converter of IR signals into visible ones.

Keywords:

competition between transitions, IR radiation, visible radiation, manganese vapor, active medium, brightness amplifier

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