{"product_id":"absorptive-nd-filter-25-4mm-od0-4","title":"Absorptive ND Filter, Ø25.4 mm, OD 0.4","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eAbsorptive neutral density filters use neutral absorbing glass (NG-series colored glass) as the substrate, achieving uniform attenuation through broadband bulk absorption with nearly wavelength-independent behavior across the visible range — reducing intensity while preserving the original spectral shape. Simple, stable, and cost-effective, they are often paired with a double-sided AR coating to lower surface reflection and raise effective transmission. Widely used for imaging brightness control, optical measurement, detector protection, and laboratory intensity adjustment.\u003c\/p\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBroadband beam attenuation\u003c\/li\u003e\n  \u003cli\u003eLaser power \/ intensity control\u003c\/li\u003e\n  \u003cli\u003eImaging \u0026amp; detector protection\u003c\/li\u003e\n  \u003cli\u003eOptical measurement \u0026amp; illumination control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eConstruction \u0026amp; Performance\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstrate:\u003c\/strong\u003e Neutral Absorbing Glass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Ø25.4 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 2.0 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpectral range:\u003c\/strong\u003e 400–700 nm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOD:\u003c\/strong\u003e 0.4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClear aperture:\u003c\/strong\u003e \u0026gt;90%\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eParallelism:\u003c\/strong\u003e 5 arcmin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface quality:\u003c\/strong\u003e 80-50\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface flatness:\u003c\/strong\u003e λ\/2 @ 633 nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eStorage \u0026amp; Handling\u003c\/h2\u003e\n\u003cp\u003eFor optimal performance, store and use at 25 °C and 40–60% relative humidity. If the surface becomes contaminated, clean gently with ≥99% alcohol and lint-free lens tissue; never use coarse cloth, water, or abrasive cleaners, which may damage the optic.\u003c\/p\u003e","brand":"WaveQuanta","offers":[{"title":"Default Title","offer_id":48194697658522,"sku":"O-NDF-25.4-2.0-BL517","price":0.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/664696-nd-main.png?v=1780478367","url":"https:\/\/waveqvanta.com\/products\/absorptive-nd-filter-25-4mm-od0-4","provider":"WaveQuanta","version":"1.0","type":"link"}