期刊
OPTICS EXPRESS
卷 28, 期 2, 页码 2091-2106出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.379960
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- LABEX Cluster of Excellence FIRST-TF within the Program Investissements d'Avenir [ANR-10-LABX-48-01]
- Nord-Pas de Calais Regional Council
- Fonds Europeens de Developpement Regional, Contrat de Projets Etat Region (CPER)' Photonics for Society
We report the measurement of the frequency noise power spectral density (PSD) of a Terahertz (THz) molecular laser (ML) pumped by a mid-infrared (MIR) quantum cascade laser (QCL), and emitting 1 mW at 1.1 THz in continuous wave. This is achieved by beating the ML frequency with the 1080th harmonic of the repetition rate of a 1560 nm frequency comb (FC). We find a frequency noise PSD < 10Hz(2)/Hz (-95dBc/Hz) at 100kHz from the carrier. To demonstrate the effect of the stability of the pump laser on the spectral purity of the THz emission we also measure the frequency noise PSD of a CO2-laser-pumped 2.5THz ML, reaching 0.1Hz(2)/Hz (-105dBc/Hz) at 40kHz from the carrier, limited by the frequency noise of the FC harmonic. Finally, we show that it is possible to actively phase-lock the QCL-pumped molecular laser to the FC repetition rate harmonic by controlling the QCL current, demonstrating a sub-Hz linewidth. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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