Imaging in the visible spectral range of processes in media transparent only to IR radiation requires the use of active IR-to-visible converters. In this work, we simulate the conversion of IR radiation into the visible based on competition between transitions in Mn vapor active media with the use of a spatiotemporal kinetic model of an active medium. We estimate the conversion efficiency for continuous and pulsed input IR signals in a wide range of signal power for different pulse frequencies (from 2 to 20 kHz). We show the pulsed mode and pulse frequencies lower than an optimal frequency in terms of amplified spontaneous emission power to be optimal for this conversion. The measurable conversion efficiency is higher than 10 for medium-size GDT. Our results confirm the usability of a bistatic Mn vapor laser monitor for negative imaging of processes in a medium transparent for IR radiation, i.e., a possibility of creating a narrowband pulsed IR-to-visible converter.
Kulagin et al. (Wed,) studied this question.