[PDF]    http://dx.doi.org/10.3952/lithjphys.51304

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 51, 221–229 (2011)


GENERATION OF TUNABLE INFRARED FEMTOSECOND PULSES VIA PARAMETRIC VISIBLE-TO-INFRARED FREQUENCY CONVERSION
J. Darginavičius a, E. Rubino b, G. Tamošauskas a, D. Faccio c, G. Valiulis a, P. Di Trapani b, A. Piskarskas a, and A. Dubietis a
a Department of Quantum Electronics, Vilnius University, Saulėtekio 9 bldg. 3, LT-10222 Vilnius, Lithuania
E-mail: audrius.dubietis@ff.vu.lt
b CNISM and Department of Physics and Mathematics, Università dell‘Insubria, Via Vallegio 11, IT-22100 Como, Italy
c School of Engineering and Physical Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, UK

Received 23 May 2011; revised 31 August 2011; accepted 21 September 2011

We propose two methods for ultrashort pulse parametric visible-to-infrared frequency conversion, that are directly applied to extend the tuning range of a commercial Ti:sapphire laser-noncollinear optical parametric amplifier system. The first method is based on broadband noncollinear four-wave optical parametric amplification in fused silica, and the second is based on cascaded three-wave parametric interaction in a single BBO crystal. The proof-of-principle experiments demonstrate generation of sub-30-fs, ~20 μJ pulses, broadly tunable across the infrared (1–3 μm) spectral range.
Keywords: optical parametric amplifiers, femtosecond pulses, infrared, four-wave mixing, difference frequency generation
PACS: 42.65.Re, 42.65.Yj


DERINAMO DAŽNIO INFRARAUDONŲJŲ FEMTOSEKUNDINIŲ IMPULSŲ GENERAVIMAS PARAMETRIŠKAI KEIČIANT REGIMOSIOS SPINDULIUOTĖS DAŽNĮ
J. Darginavičius a, E. Rubino b, G. Tamošauskas a, D. Faccio c, G. Valiulis a, P. Di Trapani b, A. Piskarskas a, A. Dubietis a
a Vilniaus universiteto Kvantinės elektronikos katedra, Vilnius, Lietuva
b CNISM ir Insubrijos universiteto Fizikos ir matematikos katedra, Komo, Italija
c SUPA ir Heriot-Watt universiteto Inžinerijos ir fizinių mokslų mokykla, Edinburgas, Jungtinė Karalystė

Pasiūlyti du metodai parametriškai keisti regimąją spinduliuotę infraraudonąja, leidžiantys praplėsti komercinės Ti:safyro lazerio ir nekolinearaus parametrinio šviesos stiprintuvo sistemos dažnių derinimo sritį. Pirmasis metodas remiasi plačiajuosčiu nekolineariu keturbangiu optiniu parametriniu stiprinimu lydytame kvarce, o antrasis – pakopinėmis trijų bangų sąveikomis BBO kristale. Eksperimentiškai pademonstruotas mažesnės nei 30-fs trukmės ~20 μJ energijos impulsų, derinamų infraraudonojoje spektro srityje (1–3 μm), generavimas.

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