Plano concave lens, K9


H-K9L, Schott BK7

Design wavelength

632.8 nm


3mm-50mm or customized

Diameter tolerance


CT tolerance


Focal length tolerance


Surface quality


Surface Accuracy

λ/[email protected]


≤3 arcmin

Clear Aperture





A: BBAR Ravg < 1% From 400nm-700nm; B: BBAR Ravg < 1% From 700nm-1100nm

Plano Concave Lens Specification



  • Material: H-K9L, Schott BK7
  • Working wavelength: 350 nm-2 μm
  • Usage: Imaging, beam expanding or beam contracting

A plane concave lens has a concave side and a plane-side with a negative focal length. Usually used to collimate a beam, increase (decrease) the focal length, or enlarge (decrease) the image. In order to get less spherical aberration, when it is a collimation beam, that should be incident on the concave side of the plane concave lens.

Our plane concave lens with negative focal length is often used in imaging or beam collimation applications, which is made from K9 glass that conforms to the RoHS standard. K9 is the most commonly used material for high-quality optical elements, mostly for visible light and near-infrared applications.



K9 Plano concave lens, what we have manufactured


Item No. EFL(mm) Dia(mm) R1(mm)BFL(mm) Tc(mm)Te(mm)

CHINESELENS's Services Always Go Extra Mile

No more endless wasting time on that complex work of optical components. The goal of chineselens team is to make you sit down and relax. We do all the work, including manufacturing, trade, customs and logistics. Our service team will keep you informed of the progress of our manufacturing and trade.

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OEM & ODM Available

Elite R&D team, providing customized development service. If you have your own design drawing, just send us. And we could also deisgn for you.

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Lighting Fast Delivery

If you do not need custom optical components, only standard optics, and if we have stock, then support fast delivery.

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ISO 9001:2015 Passed

Our company has passed the ISO 9001:2015 quality management system certification and we work as 6S management.

Our Products

If you have optical components designed or needed to design, just send us your requirements, we will produce glass optical lenses, optical prisms, optical filters, optical windows and any other optical products for you.

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Aspheric lens

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Achromatic Lens 4

Achromatic lens

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Powell lens

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Optical prism

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Optical filter

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Why Choose Chineselens?

With many years of production experience and capability of optical lens, prisms and filters etc, we have become a reliable partner for many companies of laser and quantum physics, institutes and research institutions

We take optical components top quality seriously for our customers. 

We take our customers seriously, and even their orders are little since we desire long-term connections.

Various services to help your business grow fast.

Our company has over 50 workers, and also all of them have years of China sourcing experiences for a variety of items..

Helping clients obtain reasonable product price is one of the key points to make our customers competitive in the market.

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ISO 9001:2015

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Quick response

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Fast delivery

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Design on demand

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All good reviews

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Reasonable price

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Insepection 100%

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Clients from 30+ countries

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Long-term business

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Sample free on stock

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