9 Molecule and Solid State Physics 9.15 Related Experiments
Nd:YAG laser
P2260900 Principle The rate equation model for an optically pumped four-level laser system is determined. As lasing medium, a Nd:YAG (NeodymiumYttrium Aluminium Garnet) rod has been selected which is pumped by means of a semiconductor diode laser. The IR-power output of the Nd:YAG laser is measured as a function of the optical power input and the slope efficiency as well as the threshold power are determined. Finally, a KTP-crystal is inserted into the laser cavity and frequency doubling is demonstrated. The quadratic relationship between the power of the fundamental wave and the beam power for the second harmonic is then evident.
For more details refer to page 302.
Peltier heat pump
P2410800 Principle The (cooling capacity) heating capacity and efficiency rating of a Peltier heat pump are determined under different operating conditions. Tasks 1. To determine the cooling capacity Pc the pump as a function of the current and to calculate the efficiency rating hc at maximum output. 2. To determine the heating capacity Pw of the pump and its efficiency rating hw at constant current and constant temperature on the cold side.
For more details refer to page 95.
Characteristic curves of a solar cell
P2410901 Principle The current-voltage characteristics of a solar cell are measured at different light intensities, the distance between the light source and the solar cell being varied. The dependence of noload voltage and short-circuit current on temperature is determined.
For more details refer to page 124.
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