1 May 2014 DFG-based mid-IR laser system for muounic-hydrogen spectroscopy
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The goal of this work is to prove the feasibility of building a laser system that can generate mid-infrared radiation with the parameters required for the measurement of the hyperfine splitting in the ground state of the mounic hydrogen spectroscopy. The first experimental results of a very straightforward scheme that, to our knowledge, has not been considered in the literature, are presented. We study a laser test bench system emitting nanosecond pulses of infrared tunable radiation in the spectral range 6.78 μm with high energy and narrow line-width, based on direct difference frequency generation (DFG), in non-oxide nonlinear crystals, using as pump lasers a single-mode Nd:YAG laser and tunable narrowbandwidth Cr:forsterite laser. The investigated system is based on lithium thioindate (LiInS2) and silver thiogallate (AgGaS2) crystals cut for type II difference frequency generation. The pulses of the Nd:YAG laser (1,064 μm) are combined with the pulses at ~ 1.262 μm of the Cr:forsterite laser through a dichroic mirror and sent to the nonlinear crystals in different optical geometries. The generated radiation reaches an output energy up to 80 μJ in a single pass optical geometry, has 10 ns long pulses at 50 Hz frequency repetition rate and is tunable in the range 6595 – 6895 nm. These first results prove the suitability of such an approach for building the laser system for the muonic-hydrogen experiment.
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Lyubomir I. Stoychev, Lyubomir I. Stoychev, Miltcho B. Danailov, Miltcho B. Danailov, Alexander A. Demidovich, Alexander A. Demidovich, Ivaylo P. Nikolov, Ivaylo P. Nikolov, Paolo Cinquegrana, Paolo Cinquegrana, Paolo Sigalotti, Paolo Sigalotti, Dimitar Bakalov, Dimitar Bakalov, Andrea Vacchi, Andrea Vacchi, "DFG-based mid-IR laser system for muounic-hydrogen spectroscopy", Proc. SPIE 9135, Laser Sources and Applications II, 91350J (1 May 2014); doi: 10.1117/12.2052110; https://doi.org/10.1117/12.2052110

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