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Single-laser polarization-controlled optical sampling system for THz-TDS

: Kolano, M.; Gräf, B.; Weber, S.; Molter, D.; Freymann, G. von


Optics Letters 43 (2018), Nr.6, S.1351-1354
ISSN: 0146-9592
Fraunhofer ITWM ()

We demonstrate a polarization-multiplexed, single-laser system for terahertz (THz) time-domain spectroscopy without an external delay line. The fiber laser emits two pulse trains with independently adjustable repetition rates, utilizing only one laser-active section and one pump diode. With a standard fiber-coupled THz setup and a polarization-multiplexed optical amplifier, we are able to measure transients with a spectral bandwidth of 1.5 THz and a dynamic range of 50 dB in a measurement time of 1 s. Based on the novel laser architecture, we call this new approach single-laser polarization-controlled optical sampling, or SLAPCOPS.