Femtosecond Yb-fiber laser synchronously pumped HgGa2S4 optical parametric oscillator tunable in the 4.4- to 12-μm range

Popien, Stefan; Beutler, Marcus; Rimke, Ingo; Badikov, Dmitrii; Badikov, Valeriy; Petrov, Valentín

doi:10.1117/1.oe.57.11.111802

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…The OP semiconductors with periodic inversion of crystalline orientation use quasi-phase matching (QPM) for NLO interactions, whereas chalcopyrite semiconductors and orthorhombic ternary chalcogenides generally utilize birefringent phase matching (BPM). Extensive experimental studies of mid-IR laser sources using chalcopyrite semiconductors (e.g., silver thiogallate (AgGaS 2 , AGS), silver gallium selenide (AgGaSe 2 , AGSe), cadmium silicon phosphide (CdSiP 2 , CSP), and zinc germanium phosphide (ZnGeP 2 , ZGP)), defect chalcopyrite crystals (e.g., mercury thiogallate (HgGa 2 S 4 , HGS) and cadmium selenide (CdSe)), and orthorhombic ternary chalcogenides (e.g., lithium thioindate (LiInS 2 , LIS), lithium thiogallate (LiGaS 2 , LGS), and lithium gallium selenide (LiGaSe 2 , LGSe)) have been reported continuously in recent years [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mid-Infrared Broadband Second-Harmonic Generation in Non-Oxide Nonlinear Optic Crystals

Kim

Lee

2021

Crystals

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The mid-infrared (mid-IR) continuum generation based on broadband second harmonic generation (SHG) (or difference frequency generation) is of great interest in a wide range of applications such as free space communications, environmental monitoring, thermal imaging, high-sensitivity metrology, gas sensing, and molecular fingerprint spectroscopy. The second-order nonlinear optic (NLO) crystals have been spotlighted as a material platform for converting the wavelengths of existing lasers into the mid-IR spectral region or for realizing tunable lasers. In particular, the spectral coverage could be extended to ~19 µm with non-oxide NLO crystals. In this paper, we theoretically and numerically investigated the broadband SHG properties of non-oxide mid-IR crystals in three categories: chalcopyrite semiconductors, defect chalcopyrite, and orthorhombic ternary chalcogenides. The technique is based on group velocity matching between interacting waves in addition to birefringent phase matching. We will describe broadband SHG characteristics in terms of beam propagation directions, spectral positions of resonance, effective nonlinearities, spatial walk-offs between interacting beams, and spectral bandwidths. The results will show that the spectral bandwidths of the fundamental wave allowed for broadband SHG to reach several hundreds of nm. The corresponding SH spectral range spans from 1758.58 to 4737.18 nm in the non-oxide crystals considered in this study. Such broadband SHG using short pulse trains can potentially be applied to frequency up-conversion imaging in the mid-IR region, in information transmission, and in nonlinear optical signal processing.

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