| 主权项 |
1. A compact multispectral imaging system, comprising:
two or more refractive optical elements, wherein the optical elements can simultaneously focus light from shortwave infrared (SWIR) spectral bands, midwave infrared (MWIR) spectral bands, longwave (LWIR) infrared spectral bands, or any combination thereof to a common focal plane, wherein at least one optical element comprises an optical material as defined by one of the following descriptions:
a polycrystalline ceramic material comprising a Group 2 element, a lanthanide, and sulfur, and having greater than 65% transmission in SWIR, MWIR and LWIR wavelength regions, a refractive index of about 2.49 at a wavelength of 3 μm, a SWIR Abbe number (VSWIR) of about 31, a MWIR Abbe number (VMWIR) of about 93, a LWIR Abbe number (VLWIR) of about 20, and a coefficient of thermal expansion (CTE) of about 15×10−6/° C.;an optical glass material comprising arsenic and sulfur and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.56 μm and a −3 dB multiphonon edge at about 12.7 μm, a refractive index of about 2.40 at a wavelength of 3 μm, a VSWIR of about 23, a VMWIR of about 162, a VLWIR of about 48, a thermo-optic coefficient (dn/dT) of about −17×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 195° C., a viscosity of about 108.4 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 26.6×10−6/° C.;an optical glass material comprising Ge, As, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.79 μm and a −3 dB multiphonon edge at about 18.2 μm, a refractive index of about 2.71 at a wavelength of 3 μm, a VSWIR of about 15, a VMWIR of about 175, a VLWIR of about 142, a thermo-optic coefficient (dn/dT) of about 39×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 196° C., a viscosity of about 108.7 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 23.2×10−6/° C.;an optical glass material comprising Ge, As, S, and Te and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.89 μm and a −3 dB multiphonon edge at about 12.5 μm, a refractive index of about 2.40 at a wavelength of 3 μm, a VSWIR of about 22, a VMWIR of about 160, a VLWIR of about 48, a thermo-optic coefficient (dn/dT) of about −5.9×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 196° C., a viscosity of about 108.8 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 25.6×10−6/° C.;an optical glass material comprising Ge, As, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.78 μm and a −3 dB multiphonon edge at about 17.5 μm, a refractive index of about 2.65 at a wavelength of 3 μm, a VSWIR of about 16, a VMWIR of about 201, a VLWIR of about 235, a thermo-optic coefficient (dn/dT) of about −18.4×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 201, a viscosity of about 10101 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 30.2×10−6/° C.;an optical glass material comprising Ge, As, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.74 μm and a −3 dB multiphonon edge at about 17.2 μm, a refractive index of about 2.48 at a wavelength of 3 μm, a VSWIR of about 19, a VMWIR of about 200, a VLWIR of about 127, a thermo-optic coefficient (dn/dT) of about 8.3×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 192, a viscosity of about 1097 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 26×10−6/° C.;an optical glass material comprising Ge, As, Se, and Te and having transmission in MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 1.43 μm and a −3 dB multiphonon edge at about 18.2 μm, a refractive index of about 3.18 at a wavelength of 3 μm, a VMWIR of about 111, a VLWIR of about 258, a thermo-optic coefficient (dn/dT) of about 177×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 191, a viscosity of about 1087 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 18.3×10−6/° C.;an optical glass material comprising Ge, As, and S and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.57 μm and a −3 dB multiphonon edge at about 12.7 μm, a refractive index of about 2.39 at a wavelength of 3 μm, a VSWIR of about 24, a VMWIR of about 161, a VLWIR of about 47, a thermo-optic coefficient (dn/dT) of about −6.1×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 201, a viscosity of about 108.7 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 25.3×10−6/° C.;an optical glass material comprising Ge, As, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.79 μm and a −3 dB multiphonon edge at about 18.9 μm, a refractive index of about 2.67 at a wavelength of 3 μm, a VSWIR of about 15, a VMWIR of about 189, a VLWIR of about 185, a thermo-optic coefficient (dn/dT) of about 1.5×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 193, a viscosity of about 108.8 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 25.7×10−6/° C.;an optical glass material comprising Ge, As, S, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.61 μm and a −3 dB multiphonon edge at about 12.8 μm, a refractive index of about 2.42 at a wavelength of 3 μm, a VSWIR of about 23, a VMWIR of about 162, a VLWIR of about 50, a thermo-optic coefficient (dn/dT) of about −3.9×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 197, a viscosity of about 1086 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 25.1×10−6/° C.;an optical glass material comprising Ge, As, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.74 μm and a −3 dB multiphonon edge at about 17.5 μm, a refractive index of about 2.53 at a wavelength of 3 μm, a VSWIR of about 18, a VMWIR of about 195, a VLWIR of about 134, a thermo-optic coefficient (dn/dT) of about 23.5×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 191, a viscosity of about 1089 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 27×10−61° C.;an optical glass material comprising As, S, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.62 μm and a −3 dB multiphonon edge at about 12.9 μm, a refractive index of about 2.43 at a wavelength of 3 μm, a VSWIR of about 23, a VMWIR of about 164, a WLWIR of about 52, a thermo-optic coefficient (dn/dT) of about −0.3×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 196, a viscosity of about 108.2 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 25.5×10−6/° C.;an optical glass material comprising As, S, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.64 μm and a −3 dB multiphonon edge at about 13 μm, a refractive index of about 2.46 at a wavelength of 3 μm, a VSWIR of about 21, a VMWIR of about 165, a VLWIR of about 56, a thermo-optic coefficient (dn/dT) of about 0.8×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 193, a viscosity of about 1081 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 25.9×10−6/° C.;an optical glass material comprising As, S, and Se and having transmission in SWIR, MWIR and LWIR wavelength regions with a −3 dB electronic edge at about 0.66 μm and a −3 dB multiphonon edge at about 13 μm, a refractive index of about 2.49 at a wavelength of 3 μm, a VSWIR of about 21, a VMWIR of about 166, a VLWIR of about 60; a thermo-optic coefficient (dn/dT) of about 1.9×10−6/° C. at a wavelength of 3 μm, a glass transition temperature (Tg) of about 192, a viscosity of about 1079 Pa·S at 240° C., and a coefficient of thermal expansion (CTE) of about 25.2×10−6/° C.;a focal plane array detector; andan imaging processing unit that processes signals from the focal plane array detector. |
