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<title><![CDATA[EC21 Product Catalogs - beam expanders]]></title>
<link><![CDATA[https://www.ec21.com/ec-market/beam_expanders--271303/1/beam expanders.html]]></link><item>
<title><![CDATA[Double Concave Lens]]></title><link><![CDATA[https://hsgdoptic.en.ec21.com/Double_Concave_Lens--12004331_12019606.html]]></link><description><![CDATA[has an equal radius of curvature on both sides of the lens. They are generally used to expand light or increase focal length in the existing system, such as beam expander and projection systems.
]]></description><pubDate><![CDATA[20241022]]></pubDate></item>
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<title><![CDATA[Plano Concave Lenses]]></title><link><![CDATA[https://syccooptics.en.ec21.com/Plano_Concave_Lenses--11952878_11952885.html]]></link><description><![CDATA[Plano concave Lenses
have one concave surface. It has negative focal length. It is often used to expand light or to increase focal length in existing systems.
Plano-Concave Lens Specifications:
Mater]]></description><pubDate><![CDATA[20240617]]></pubDate></item>
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<title><![CDATA[Silicon Windows and Silicon Lenses for Infra-Red Imaging Systems]]></title><link><![CDATA[https://clzoptics.en.ec21.com/Silicon_Windows_and_Silicon_Lenses--7138952_7138961.html]]></link><description><![CDATA[beam expanders and projection systems.More details about Plano-Concave Lenses
，
Optical Lenses
，optical Coatings
， Prism，Optical Mirror
，Precision Optics，please contact us.
CLZ Precision ]]></description><pubDate><![CDATA[20240403]]></pubDate></item>
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<title><![CDATA[2023 Free Sample/Inquiry for Drawings Biconcave Lens High Precision Optical Components]]></title><link><![CDATA[https://oplens68.en.ec21.com/2023_Free_Sample_Inquiry_for--11609135_11609150.html]]></link><description><![CDATA[beam expanders, projection optical systems and optical viewers, etc.
Oplens can not only customize the common plano-concave lens of N-BK7 or fused quartz, but also customize the biconcave lens of any]]></description><pubDate><![CDATA[20230809]]></pubDate></item>
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<title><![CDATA[BK7 Double Concave Lens]]></title><link><![CDATA[https://albrighter.en.ec21.com/BK7_Double_Concave_Lens--10771415_11766090.html]]></link><description><![CDATA[expanding beam of light and projection etc. BK7 double concave lens has excellent transmittance from visible to near infrared wavelength (350-2000nm).
Material: BK7
Design Wavelength: 587.6nm
Diamete]]></description><pubDate><![CDATA[20230407]]></pubDate></item>
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<title><![CDATA[Double Concave Lens]]></title><link><![CDATA[https://daisydong147.en.ec21.com/Double_Concave_Lens--10848859_10849633.html]]></link><description><![CDATA[has a negative focal length and are best used to diverge a converging beam. Similar to a plano-concave lens, a bi-concave lens can diverge a collimated beam to a virtual focus like a beam expander.]]></description><pubDate><![CDATA[20181108]]></pubDate></item>

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