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ZGP(ZnGeP2) Crystals
ZGP crystals possess large nonlinear coefficients (d36=75pm/V), wide infrared transparency range(0.75-12μm), high thermal conductivity(0.35W/(cm·K)), high laser damage threshold (2-5J/cm2)and well machining property, ZnGeP2 crystal was called the king of infrared nonlinear optical crystals and is still the best frequency conversion material for high power, tunable infrared laser generation. We can offer high optical quality and large diameter ZGP crystals with extremely low absorption coefficient α < 0.02 cm-1(at pump wavelengths 2.0-2.1 µm), which can be used to generate mid-infrared tunable laser with high efficiency through OPO or OPA processes.
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BGS(BaGa₄S₇) Crystals
BaGa4S7(barium gallium sulfide, BGS)crystal is a mid-infrared nonlinear crystal with wide band-gap and stable chemical properties. It has a wide light transmission range, with a UV cutoff edge of 350nm (band-gap width3.54eV)and an infrared cutoff edge of 13.7um.It also has a high nonlinear coefficient and a high damage threshold. In addition, BaGa₄S₇ crystal has no two-photon absorption at lμm,and can be used for OPO pumped by1064nm Nd:YAG lasers, especially suitable for using the1030nm fs laser, which is relatively mature in the market, as a pump source to generate various nonlinear frequency conversions such as OPA, DFG, SFG, OPG, etc.
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LGS (LiGaS2) Crystal
LGS is a new type of mid-infrared nonlinear crystal. LiGaS2 has excellent properties such as wide band gap, low two-photon absorption, wide transparent range, small group velocity mismatch, high thermal conductivity, and low thermal expansion coefficient.
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Axicon Lens
Axicon lens usually called a rotationally symmetric prism and is a axicon lens composed of a conical surface and a flat surface. Axicon lens is often used to generate a beam of Bessel intensity distribution or a conical non-divergent beam. When changing the collimated beam into a ring beam, the plane of the cone lens should face the collimated light source. The light beam generated by the conical lens passes through the optical axis. When the distance from the conical lens to the image increases, the diameter of the formed halo will also increase, while the thickness of the halo remains unchanged. The light beam has the characteristics of a Bessel beam, and the light intensity distribution along the beam propagation direction will not change.
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GaSe Crystal
Gallium Selenide (GaSe) non-linear optical single crystal, combining a large non-linear coefficient, a high damage threshold and a wide transparency range. It is a is very suitable material for SHG in the mid-IR.
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AGSe(AgGaSe2) Crystals
AGSe AgGaSe2 crystals have band edges at 0.73 and 18 µm. Its useful transmission range (0.9–16 µm) and wide phase matching capability provide excellent potential for OPO applications when pumped by a variety of different lasers. Tuning within 2.5–12 µm has been obtained when pumping by Ho:YLF laser at 2.05 µm; as well as non-critical phase matching (NCPM) operation within 1.9–5.5 µm when pumping at 1.4–1.55 µm. AgGaSe2 (AgGaSe2) has been demonstrated to be an efficient frequency doubling crystal for infrared CO2 lasers radiation.
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