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Field-resolved detection of phase-locked infrared transients from a compact Er:fiber system tunable between 55 and 107 THz

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4 Author(s)
Sell, A. ; Department of Physics and Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany ; Scheu, R. ; Leitenstorfer, A. ; Huber, R.

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We demonstrate phase-stable generation and ultrabroadband electro-optic detection of few-cycle multi-terahertz transients tunable from 55 to 107 THz based on a versatile telecom compatible three-branch Er:fiber laser system. Difference frequency mixing of two laser pulse trains at the full repetition rate of 49 MHz provides passively phase-locked multi-terahertz transients with peak fields of 69 kV/cm and average powers of up to 1.4 mW. 8 fs gating pulses from the third laser port allow for field-sensitive sampling throughout the midinfrared with a signal to noise ratio of up to 104 Hz1/2. A leadoff application in trace gas detection is discussed.

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Applied Physics Letters  (Volume:93 ,  Issue: 25 )