Journal
OPTICS EXPRESS
Volume 20, Issue 15, Pages 16662-16670Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.016662
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Funding
- ANR (France) [ANR-09-NANO-017, ANR-09-NANO-007]
- ERC (UK)
- EPSRC (UK)
- Royal Society
- Wolfson Foundation
- MARA Agency, Government of Malaysia
- Referat 221 MIWF NRW
- EPSRC [EP/E048811/1, EP/J005282/1, EP/J002356/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J005282/1, EP/J002356/1, EP/E048811/1] Funding Source: researchfish
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The emission of a quantum cascade laser can be synchronized to the repetition rate of a femtosecond laser through the use of coherent injection seeding. This synchronization defines a sampling coherence between the terahertz laser emission and the femtosecond laser which enables coherent field detection. In this letter the sampling coherence is measured in the time-domain through the use of coherent and incoherent detection. For large seed amplitudes the emission is synchronized, while for small seed amplitudes the emission is non-synchronized. For intermediate seed amplitudes the emission exhibits a partial sampling coherence that is time-dependent. (C) 2012 Optical Society of America
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