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We report the development of the frequency-modulation (FM) method formeasuring electron spin resonance (ESR) absorption in the 210-420 GHz frequencyrange. We demonstrate that using a high-frequency ESR spectrometer withoutresonating microwave components enables us to overcome technical difficultiesassociated with the FM method due to nonlinear microwave-elements, withoutsacrificing spectrometer performance. FM was achieved by modulating thereference oscillator of a 13 GHz Phase Locked Dielectric Resonator Oscillator,and amplifying and frequency-multiplying the resulting millimeter-waveradiation up to 210, 315 and 420 GHz. ESR spectra were obtained in reflectionmode by a lock-in detection at the fundamental modulation frequency, and alsoat the second and third harmonic. Sensitivity of the setup was verified byconduction electron spin resonance measurement in KC$_{60}$.

Microwave frequency modulation in continuous-wave far-infrared ESR utilizing a quasioptical reflection bridge