Çok yansımalı kovuk kip kilitli femtosaniye laserlerinde darbe enerjisi optimizasyonu

We performed a general analysis of all loss mechanisms to determine the design parameters of a Multipass-Cavity (MPC) mode-locked femtosecond Ti: Sapphire laser having the maximum output pulse energy. Advantage of the MPC design is that it allows the generation of higher output pulse energies by increasing the cavity length and consequently reducing the repetition rate. The idea of the present work is to take into account the beam clipping losses at the notches and surface of the MPC mirrors as well as the well-known reflection losses. Since losses increase with number of bounces, an optimum exists where the output pulse energy is maximized. Implementing this idea in simulations in principle can give an optimum MPC configuration with much higher pulse energy. Experimental implementation of the optimum configuration confirmed the simulation results completely. In the standard MPC configuration, maximum measured pulse energy was around 14.8nJ. In the optimum configuration, we measured 32.7nJ of pulse energy. This corresponds to an increase in the pulse energy of about 101%.