BaGa2GeSe6 Crystal - An Overview
BaGa2GeSe6 Crystal - An Overview
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BaGa4Se7 (BGSe) and BaGa2GeSe(BGGSe) crystals are novel infrared nonlinear optical resources independently created by Chinese researchers. As a result of fantastic detailed overall performance along with the vital application value in laser marketplace, they may have captivated A great deal notice in the home and abroad.
We derive explicit expressions during the body from the optical indicatrix for the second-order effective nonlinearity in biaxial crystals with position groups 2, m, and 1, governing the conversion efficiency in 3-wave nonlinear optical interactions. The tabulated expressions for the monoclinic symmetry classes 2 and m are valid for all doable orientations from the optical indicatrix relative on the crystallographic body and for propagation together an arbitrary course outside the house the principal planes. They may be used for immediate estimation of the successful nonlinearity in exactly the same frame where by the period-matching loci are calculated.
We existing new experimental benefits for your stage-matching properties of the a short while ago identified BaGa2GeSe6
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We make high-get harmonics from crystalline solids employing a tunable mid-IR OPA with fifty kHz repetition charge. Making use of nonlinear self-compression in YAG crystals, we produce sub 3-cycle pulses at 3.eight μm wavelength for prime harmonic spectroscopy. Study more
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0 Summary Summary: BaGa4Se7 (BGSe) and BaGa2GeSe6 (BGGSe) crystals are novel infrared nonlinear optical elements independently developed by Chinese researchers. Because of the fantastic in depth overall performance and also the crucial application benefit in laser marketplace, they have got captivated much attention in the home and overseas.
The progress of crystal expansion and laser output of BGSe and BGGSe are summarized, and the long run growth is prospected.
Through the final many years, mid-infrared (3–twelve μm) laser sources making use of crystals with nonlinear optical Houses have attracted a certain notice because of their possible purposes in different fields including optical counter-steps and distant chemical sensing. As transparency of frequent oxide crystals is restricted to about four μm, a lot of researches are already focused on chalcopyrite compounds on account of their vast transparency inside the mid-IR range as well as their solid nonlinear optical coefficients. You will find there's will need of this sort of crystals able to transform successfully the in close proximity to infrared wavelengths from commercially readily available lasers into wavelengths higher than 5 μm by Optical Parametric Oscillators (OPO) systems.
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A high quality BGGSe one crystal with measurement of thirty mm×ninety mm was grown by Bridgman-stockbarger method, which happens to be the very first in China. The productive fabrication of BGGSe crystal products was also accomplished right after orienting, chopping, and sharpening procedures, which laid a good foundation for that even more software analysis of the crystal.
The behavior of dislocations within the interfacial region amongst the epitaxial layer developed from your liquid phase and the substrate of GaAs is investigated. Observations of dislocations lying together the 〈one hundred ten�?directions had been carried out applying an optical microscope following shallow etching that has a new chemical etchant.
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The pump pulse Power was controlled by a variable diffraction attenuator. Its polarization was tuned by ninety° with a half-wave plate since it had to be normal wave while in the BGGSe (when AGS crystal was employed, the sign beam polarization was tuned). The sign beam was focused by spherical mirror (M2, the focal length of two m) right into a gas tube of one.
The nature of this instability and DFG Electrical power lessen is not distinct for us. One of The explanations might be similar which has a nonlinear absorption and plasma development, respectively, that causes reflection/scattering/absorption from the longwave mid-IR pulse. The dependence of BGGSe transmittance on pump pulse Strength is offered in Fig.