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Proceedings Paper

DFG-based mid-IR laser system for muounic-hydrogen spectroscopy
Author(s): Lyubomir I. Stoychev; Miltcho B. Danailov; Alexander A. Demidovich; Ivaylo P. Nikolov; Paolo Cinquegrana; Paolo Sigalotti; Dimitar Bakalov; Andrea Vacchi
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Paper Abstract

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.

Paper Details

Date Published: 1 May 2014
PDF: 6 pages
Proc. SPIE 9135, Laser Sources and Applications II, 91350J (1 May 2014); doi: 10.1117/12.2052110
Show Author Affiliations
Lyubomir I. Stoychev, Istituto Nazionale di Fisica Nucleare (Italy)
The Abdus Salam International Ctr. for Theoretical Physics (Italy)
Miltcho B. Danailov, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Alexander A. Demidovich, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Ivaylo P. Nikolov, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Paolo Cinquegrana, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Paolo Sigalotti, Elettra-Sincrotrone Trieste S.C.p.A. (Italy)
Dimitar Bakalov, Institute for Nuclear Research and Nuclear Energy (Bulgaria)
Andrea Vacchi, Istituto Nazionale di Fisica Nucleare (Italy)

Published in SPIE Proceedings Vol. 9135:
Laser Sources and Applications II
Jacob I. Mackenzie; Helena JelÍnková; Takunori Taira; Marwan Abdou Ahmed, Editor(s)

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