Ultrashort pulsed laser amplifier: simultaneous optimization of thermally induced diffraction loss and energy transfer upconversion

Abstract

Abstract In this work, thermally induced diffraction loss and energy transfer upconversion (ETU) are considered for optimization of an ultrashort-pulsed laser amplifier. In this regard, pump spot size and signal to pump mode ratio are optimized in order to maximize the signal output energy. Toward this, the Frantz-Nodvik equation of ultrashort-pulsed laser amplifier with thermal induced diffraction loss and ETU theories were combined. Results show the power of this two-theory combination for optimization tasks of pico-second pulsed amplifiers. Optimized values of w p = 90.2 μ m and w s / w p = 0.62 for output energy of 2.3  µj are reported here. This output energy is twice the values reported without parameter optimization.