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Knight Optical(UK) Ltd - sales@knightoptical.co.uk - +44 (0)1622 859444

Plane mirrors-front surface

What are you looking for in Stock?

Plane mirrors also known as front surface mirrors or first surface mirrors are used in beam steering or reflecting applications.

We stock four grades of plane front surface mirrors with a range of up to six coatings to meet applications in the UV, Visible, NIR and FIR applications.

Precision λ/10 front surface mirrors:  Our precision λ/10 front surface mirrors are manufactured from borosilicate material.  Using LEGB borosilicate or equivalent ensures the mirror has low coefficient thermal expansion properties.  These mirrors are used in high demanding beam steering and reflection applications such as imaging and astronomy.  We stock precision λ/10 front surface mirrors coated for visible wavelength with aluminium/SiO₂ and high reflective dielectric coated 99% mirror coating for high energy laser applications.


Precision λ/4 front surface mirrors: Our ranges of precision λ/4 front surface mirrors are not as expensive as the λ/10 versions. Used in many scientific instruments where quality is important but the use of the λ/10 versions cannot be justified. We stock precision λ/4 front surface mirrors coated for UV, visible, NIR and IR applications.  For UV applications as low as 180nm our quality ¼ wave mirrors are coated with aluminium/ Mgf².  For visible applications our λ/4 front surface mirrors are coated with aluminium/SiO₂ and high reflective dielectric coated 99% mirror coating.  For near infrared applications we have a range of ¼ wave mirrors coated with dielectric 98% that works efficiently to yag wavelength of 1064nm.  Our range of λ/4 front surface mirrors for applications in NIR and FIR mirrors are coated with protected silver that performs well in the visible and up to 2000nm in the NIR, and our protected gold coated quality ¼ wave mirrors work from 750nm NIR into far infrared applications.

Guaranteed 1λ over 25mm front surface mirrors:   Our range of 1λ over 25mm front surface mirrors are less expensive than ¼ wave and 10th wave mirrors but still achieve reasonable results in demanding applications.  These cost effective 1 wave mirrors are available in UV/ aluminium, enhanced aluminium and dielectric 99% coating for use in the visible. These 1 wave mirrors are typically are typically used in more demanding imaging applications where image quality is important.  Our range of  1 wave front surface mirror (first surface mirrors) are selected for guaranteed flatness of 1 wave over 25mm aperture and individually tested to ensure they meet specification.  They are manufactured from standard pre-coated sheet material.  We stock this range from UV though to infra-red to meet most scientific instrumentation applications.  Our pre-coated sheets of mirror substrates are stocked as 145x100mm plates.

General purpose front surface mirrors:  Our general-purpose grade of front surface plane mirrors are manufactured from standard coated sheet material.  These general purpose grades of first surface mirrors are available with a multitude of coatings for an extensive range of scientific instrument and lighting applications. Our stock range of front surface plane mirrors are made from good quality float glass and are generally available in thicknesses of 1mm, 3mm and 6mm thk as standard.

Stock general purpose grade mirrors can also be edges to smaller diameters and other shapes at short notice.  These mirrors are generally stocked in large sheets so larger sizes up to 1000mm square are available for projector applications.

Our stock ranges of front surface/ first surface mirrors are all available in a range of coatings to meet most applications:

  • Enhanced aluminium 94%R for visible applications.
  • 99.9% dielectric for laser use in visible applications.
  • UV aluminium for UV applications down to 180nm.
  • 98.5% dielectric for laser use in the NIR applications.
  • Ion plated silver for NIR-2000nm applications.
  • Protected gold for 750nm to far infra-red applications.  

   Contact or technical sales team for further advice and assistance.


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Our Multi-Lingual Sales Team are here to help with your requirments:

UK +44 (0)1622 859444
UK +44 (0)1622 850614
UK +44 (0)1622 851078
+001 401-583-7846

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