{"title":"Precision Optical Flats","description":"\u003cp\u003eClassically pitch-polished fused silica flats from a U.S. manufacturer with 25 years of precision etalon heritage. Reference and test flats in standard sizes, in stock, and priced below the catalog houses.\u003c\/p\u003e\u003cp\u003eAll flatness specifications are measured \u003cstrong\u003epower-included\u003c\/strong\u003e — the honest, stricter standard. A Lunt λ\/10 flat is λ\/10 total deviation including curvature, not λ\/10 with power removed.\u003c\/p\u003e","products":[{"product_id":"25mm-optical-flat-λ-10-fused-silica","title":"25mm Optical Flat, λ\/10, Fused Silica — O-025-FS-010-U","description":"\u003cp\u003ePrecision fused silica optical flat, finished by classical continuous pitch polishing — the same method Lunt has refined over 25 years of building precision Fabry-Perot etalons for solar telescopes. Surface flatness measured \u003cstrong\u003epower-included\u003c\/strong\u003e: total deviation including curvature, not power-removed.\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlatness (P-V)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eλ\/10, power-included at 632.8 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFused silica\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle surface — one polished reference face\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBetter than 60-40 scratch-dig (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface roughness (RMS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBelow 0.020 wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClear aperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90% of diameter (22 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSecondary surface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine ground to suppress back-surface reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUncoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWavelength reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e632.8 nm (HeNe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackaging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProtective storage case included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":43444455637105,"sku":"O-025-FS-010-U","price":120.0,"currency_code":"USD","in_stock":true}]},{"product_id":"50mm-optical-flat-λ-10-fused-silica","title":"50mm Optical Flat, λ\/10, Fused Silica — O-050-FS-010-U","description":"\u003cp\u003ePrecision fused silica optical flat, finished by classical continuous pitch polishing — the same method Lunt has refined over 25 years of building precision Fabry-Perot etalons for solar telescopes. Surface flatness measured \u003cstrong\u003epower-included\u003c\/strong\u003e: total deviation including curvature, not power-removed.\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlatness (P-V)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eλ\/10, power-included at 632.8 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFused silica\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle surface — one polished reference face\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBetter than 60-40 scratch-dig (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface roughness (RMS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBelow 0.020 wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClear aperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90% of diameter (45 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSecondary surface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine ground to suppress back-surface reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUncoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWavelength reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e632.8 nm (HeNe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackaging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProtective storage case included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":43444456292465,"sku":"O-050-FS-010-U","price":205.0,"currency_code":"USD","in_stock":true}]},{"product_id":"50mm-optical-flat-λ-20-fused-silica","title":"50mm Optical Flat, λ\/20, Fused Silica — O-050-FS-020-U","description":"\u003cp\u003ePrecision fused silica optical flat, finished by classical continuous pitch polishing — the same method Lunt has refined over 25 years of building precision Fabry-Perot etalons for solar telescopes. Surface flatness measured \u003cstrong\u003epower-included\u003c\/strong\u003e: total deviation including curvature, not power-removed.\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlatness (P-V)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eλ\/20, power-included at 632.8 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFused silica\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle surface — one polished reference face\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBetter than 60-40 scratch-dig (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface roughness (RMS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBelow 0.020 wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClear aperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90% of diameter (45 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSecondary surface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine ground to suppress back-surface reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUncoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWavelength reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e632.8 nm (HeNe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackaging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProtective storage case included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":43444456325233,"sku":"O-050-FS-020-U","price":275.0,"currency_code":"USD","in_stock":true}]},{"product_id":"75mm-optical-flat-λ-20-fused-silica","title":"75mm Optical Flat, λ\/20, Fused Silica — O-075-FS-020-U","description":"\u003cp\u003ePrecision fused silica optical flat, finished by classical continuous pitch polishing — the same method Lunt has refined over 25 years of building precision Fabry-Perot etalons for solar telescopes. Surface flatness measured \u003cstrong\u003epower-included\u003c\/strong\u003e: total deviation including curvature, not power-removed.\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e75 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlatness (P-V)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eλ\/20, power-included at 632.8 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFused silica\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle surface — one polished reference face\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBetter than 60-40 scratch-dig (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface roughness (RMS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBelow 0.020 wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClear aperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90% of diameter (67 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSecondary surface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine ground to suppress back-surface reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUncoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWavelength reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e632.8 nm (HeNe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackaging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProtective storage case included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":43444456554609,"sku":"O-075-FS-020-U","price":525.0,"currency_code":"USD","in_stock":true}]},{"product_id":"100mm-optical-flat-λ-10-fused-silica","title":"100mm Optical Flat, λ\/10, Fused Silica — O-100-FS-010-U","description":"\u003cp\u003ePrecision fused silica optical flat, finished by classical continuous pitch polishing — the same method Lunt has refined over 25 years of building precision Fabry-Perot etalons for solar telescopes. Surface flatness measured \u003cstrong\u003epower-included\u003c\/strong\u003e: total deviation including curvature, not power-removed.\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlatness (P-V)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eλ\/10, power-included at 632.8 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFused silica\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle surface — one polished reference face\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBetter than 60-40 scratch-dig (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface roughness (RMS)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBelow 0.020 wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClear aperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90% of diameter (90 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSecondary surface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine ground to suppress back-surface reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUncoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWavelength reference\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e632.8 nm (HeNe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackaging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eProtective storage case included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":43444456587377,"sku":"O-100-FS-010-U","price":695.0,"currency_code":"USD","in_stock":true}]}],"url":"https:\/\/luntsolarsystems.com\/collections\/optical-flats.oembed","provider":"Lunt Solar Systems","version":"1.0","type":"link"}