A technique is developed for the purpose of measuring far-infrared cyclotron resonance of carriers in solids in wide temperature range. A pulsed magnetic field apparatus consisting of a Cu-Be (2%) helical solenoid and a 7.5 KJ capacitor bank enables us to carry out the measurement up to 350 KOe. The temperature of samples in the field can be varried between 1. 6 and 300 K. As the light source, pulsed far-infrared lasers (H2O and HCN) having the power of about 1 watt are employed. Transmission signals and reference signals are detected by using two Golay cells and are averaged by two boxcar integrators.
Polarons in n-CdS have been studied by using the far-infrared cyclotron resonance apparatus, by which the temperature dependence and cyclotron frequency dependence of the effective mass of polarons were obtained.