We present an experimental and numerical analysis, how deviations of the multiplexer-retardation influence the output power of a time-multiplexed dual channel laser. The laser has two different channels, each one with its own gain medium. The channels are timemultiplexed by a single crystal photo-elastic modulator. It enables to double the repetition rate and output power of the laser. However, as multiplexing is based on polarization- switching, the retardation of the modulator should be kept within certain limits. By experimental measurement and theoretical analysis, we determine the operational window within which the retardation should be kept to avoid additional losses into the resonator. The analysis was done for two configurations of the laser setup, namely with and without a quarter-wave plate.
COBISS.SI-ID: 12825115
The gainswitched fiber laser presents the simplest construction among pulsed lasers in the nanosecond region and consequently is also very robust. These properties make it potentially appropriate for industrial applications, especially in some types of microprocessing. However, careful design of such lasers is important in order to reach the required pulse parameters (peak power and pulse duration). To design and optimize a gainswitched fiber laser for microprocessing, a numerical model using time and spatial dependencies was developed and reported in this paper. The effects of pump power and laser length on the pulse duration and peak power were investigated by modeling gainswitched operation. Further, the results of modeling were compared to data from an experimental setup based on a Yb3+ doped gainswitched fiber laser, revealing good agreement.
COBISS.SI-ID: 12826395
In this paper we report on a theoretical and experimental study of the steady-state response, transient response and efficiency of a thermal management system. We compare two alternative designs based on thermo-electric modules, the role of which is to control the temperature of the laser-diode pumping system for advanced fiber lasers. The performances of a standard pulse-width modulation controller and a variable-voltage controller were tested on a reference thermal management system. An experimental facility and a numerical model were set up, with the system response to various load conditions measured as well as numerically simulated. The results show that the design of the thermal management system based on the variable-voltage controller offers a significant performance advantage over the pulse-width modulation design.
COBISS.SI-ID: 12831259