{"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}],"url":"https:\/\/luntsolarsystems.com\/products\/25mm-optical-flat-%ce%bb-10-fused-silica","provider":"Lunt Solar Systems","version":"1.0","type":"link"}