of mirror dimension Square mirrors (λ/4)
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1 24.1 Mirror coatings Dielectric coatings Dielectric mirror coatings are very hard and durable and, having negligible absorption, are suitable for high powers. Our coatings, being broad-band, are much more versatile than ordinary lasermirror coatings; has about 99% reflectance over nm, 0 to 4. IR-98 covers nm with average reflectance of about 98.% at 0 (97% at 4 ); in particular,the reflectance at 1064nm is designed to be high for normal incidence. Metal coatings Metal coatings cover wider ranges than dielectrics and are lower in cost. Ion-plated silver surpasses both aluminium and gold for reflectance over the range 420-0nm, and is useful throughout the IR. The usual drawbacks of silver (softness and tarnishing) have been overcome by a hard dielectric coating applied by new technology,giving excellent chemical and mechanical protection. is a good generalpurpose coating for the visible. The reflectance is considerably increased by 90 4 O (typical) Enh. aluminium UV aluminium IR-98 Ion-plated silver Protected gold (nm) Reflection (typical) IR-98, 8 deg. IR-98, 4 deg. Visble-99, 8 deg. Visble-99, 4 deg (nm) the dielectric overcoat and peaks at about 94%. Protected aluminium (Al + SiOx), used on our elliptical and concave mirrors, is a versatile coating with 8-90% reflectance in the visible and also useful in the IR and UV. UV aluminium is used for the UV (down to below 180nm) and Protected gold for the IR. Both these coatings are very delicate; to clean use an air-duster (p.8) or,if necessary,cotton-wool with acetone or other solvent..2 Precision plane mirrors These mirrors of guaranteed flatness are suitable for interferometry and other demanding applications. Low-expansion glass (LEBG, see p.2) is used for the λ/10 series to reduce thermal distortions. Circular mirrors (λ/10) Catalogue No. Catalogue No. Dia. Th. Enhanced Al 2 MF 01 2 MF MF MF MF MF 01 1 : λ/4 over test area 90% of mirror dimension λ/10 over entire area mm +0.1, -0.3mm (see p.2) Square mirrors (λ/4) Catalogue No. Length x width Enhanced Al 10 MX x MX x MX 2 2 x MX x MX 0 0 x 0 8 Circular mirrors (λ/4) Rectangular mirrors (λ/4) Catalogue No. Length x width Enhanced Al 16 MX x MX 16 2 x MX 2 40 x MX x 40 8 Catalogue No. Catalogue No. Catalogue No. Catalogue No. Catalogue No. Catalogue No. IR-98 Enhanced Al Ion-plated silver UV aluminium Protected gold 10 MX MX MX 0 16 MX MX MX MX MX 02 2 MX 0 2 MX 01 2 MX 06 2 MX 04 2 MX MX MX 0 40 MX MX MX MX MX 02 0 MX 0 0 MX 01 0 MX 06 0 MX 04 0 MX MX MX 01 1
2 2.3 Optical flats These uncoated flats are used for checking the flatness of other surfaces from the interference fringes (Newton s rings) seen when the surfaces are in contact, in monochromatic light. They are also useful as substrates for special mirrors. λ/10 (front face) 1λ (rear face) LEBG (see p.2) (see p.2) Special mirror and other coatings Double-sided substrates p.32 Catalogue No. 2 MF MF MF MF Elliptical mirrors When used at 4, these mirrors present a circular cross-section, with no obscuration from the edges beyond the mirror aperture. Catalogue No. Major (minor axis) axis (mm) 2 MD MD MD They are used as secondary mirrors in Newtonian telescopes. Another possible use is for mounting in a tube, where the maximum possible aperture is required. λ/4 (minor axis) Coating (see p.24) Protected aluminium Float glass (see p.2) (see p.2). Plane mirrors (1λ over 2mm) These mirrors of guaranteed flatness are available in a wide range of sizes at very reasonable prices, made possible by bulk preparation of the material. 1λ over any 2mm dia. ±0.2mm ±0.2mm (3mm) +0, -0.mm (6mm) Coating data p.24 More sizes p.26 Circular mirrors Square mirrors Rectangular mirrors Catalogue No. 2 MJ MQ MQ ME ME ME ME ME 00 6 Catalogue No. Length x width 16 MJ x MJ 2 2 x MQ x MQ x ME 2 2 x ME x ME 0 0 x ME x 63 6 Catalogue No. Length x width 16 MJ x MJ 16 2 x MJ 2 40 x MQ x MQ 16 2 x ME 2 40 x ME x 40 6 ME 63 x 63 6 UK/Europe/Rest of world The Americas Sales +44 (0) Sales COMAR (26627) Technical +44 (0) Technical Fax +44 (0) Fax mail@comarinstruments.com solutions@comaroptics.com
3 26.6 General-purpose plane mirrors These mirrors, generally on float glass substrates, have a wide range of uses. 1.1mm thick mirrors are useful for their low inertia in scanning systems. 3mm and 6mm mirrors have better flatness and are useful for camera, microscope or projector systems, illumination, sensing etc. Special sizes of all materials are readily available. (typical): 1.1mm thick 3mm/6mm thick 1λ over 10mm 2λ over 2mm ±0.3mm ( 80mm) ±0.mm (>80mm) ±0.2mm ( 3mm) +0, -0.mm (6mm) Coating data see p.24 Catalogue No. Catalogue No. Catalogue No. Catalogue No. Catalogue No. Catalogue No. Dimensions IR-98 Enhanced Al Ion-plated silver UV aluminium Protected gold (mm) Circular mirrors 06 MH MV MP x MH MI MV MP x MH 00 2 MV 00 2 x MG MT x 3 16 MG MI MT MP x 3 2 MG 00 2 MI 00 2 MT 00 2 MP 00 2 MK 00 2 MN 00 2 x 3 40 MG MT MP MK MN x 3 0 MG 00 0 MI 00 0 MT 00 0 MP 00 0 x 3 0 MC 00 0 x 6 MC 00 x 6 Square mirrors 06 MH MV x 6.3 x MH MI MV MP x 10 x MH MV x 16 x MH 2 2 MV 2 2 x 2 x MV x 40 x MG MT MK MN x 10 x 3 16 MG MI MT MP MK MN x 16 x 3 2 MG 2 2 MI 2 2 MT 2 2 MP 2 2 MK 2 2 MN 2 2 x 2 x 3 40 MG MT MP x 40 x 3 0 MG 0 0 MT 0 0 MP 0 0 MK 0 0 MN 0 0 x 0 x 3 63 MG MT MP x 63 x 3 0 MC 0 0 x 0 x 6 63 MC x 63 x 6 80 MC x 80 x 6 MC x x MC x 160 x 6 20 MC x 20 x 6 Rectangular mirrors 10 MH MI MV x 6.3 x MH MV x 10 x MH 16 2 MV 16 2 x 16 x MG MI MT MK MN x 10 x 3 2 MG 16 2 MI 16 2 MT 16 2 MP 16 2 MK 16 2 MN 16 2 x 16 x 3 40 MG 2 40 MT 2 40 MP 2 40 MK 2 40 MN 2 40 x 2 x 3 63 MG MT MP MK MN x 40 x 3 40 MC 2 40 x 2 x 6 63 MC x 40 x 6 MC 63 x 63 x MC 160 x x 6 20 MC x 160 x 6 Stock optics reduced in size as needed Larger sizes available from stock sheets Metal parts machined as required
4 27.7 Quality concave mirrors Compared to lenses, spherical mirrors have the advantages of perfect achromatism, considerably lower spherical aberration (see box) and wide wavelength coverage. Catalogue No. FL Dia. Radius (mm) Focal length ±2% Coating Al/SiOx (visible reflectance 8-90%) (see p.2) 16 SQ SQ SQ SQ SQ SQ Alternative items available Mirror coatings (see p.3) can easily be applied to lenses (pp. 4, 10 etc.) to form convex or concave mirrors 2 SQ SQ SQ SQ SQ Aberration calculation (see p.2) k = Concave lamp reflectors These spherical front-surface reflectors of very wide aperture are mainly intended as back reflectors for lamphouses. They are positioned with the lamp at the centre of curvature and form a same-size image which can be superimposed on the source or positioned just beside it. Focal length Coating ±1mm ±0.2mm Protected Al Catalogue No. Focal Radius of Source to rim length (mm) curvature plane clearance (mm) 08 SR SR SR SR Cube beamsplitters Cube beamsplitters, although more expensive than plates, have the advantages of stability, ease of mounting, equality of optical paths and absence of a second-surface ghost image. This range has hybrid coatings with considerably smaller polarising effect than the common all-dielectric types. Catalogue No. Dimensions (mm) 06 JQ x 6.3 x JQ x 10 x JQ x 16 x 16 2 JQ 01 2 x 2 x 2 40 JQ x 40 x 40 0 JQ 01 0 x 0 x 0 Wavelength range nm Reflectance* 4 ±% Transmittance* 4 ±% Polarisation ratio Rs/Rp = 1.2 approx. Outer face coatings Multilayer AR BK7 (see p.2) *Average over wavelength range Polarising cube beamsplitters p.42 Cube connectors p.9 Clevis mounts p.9 UK/Europe/Rest of world The Americas Sales +44 (0) Sales COMAR (26627) Technical +44 (0) Technical Fax +44 (0) Fax mail@comarinstruments.com solutions@comaroptics.com
5 28.10 Plate beamsplitters Plate beamsplitters are considerably lighter and cheaper than the traditional cubes, and avoid the problem of stray light back-reflected from the entry and exit faces. Our Precision and Standard ranges both have dielectric multilayer coatings giving excellent durability and neutrality and much less affected by temperature changes than ordinary evaporated coatings. The spurious reflection from the back surface is almost eliminated by multilayer AR coating. The Precision range has optically polished BK7 substrates flat to λ/4. The Standard range is prepared as large sheets, allowing us to offer a wide range of satisfactory quality for most purposes at a very reasonable cost. We can also cut special sizes at short notice. The Economy range has a single-layer dielectric (TiO2) beamsplitting coating, without AR, and offers very large sizes at low cost. Highly efficient, hard, all-dielectric coatings All (except Economy range) multi AR coated on the back surface Precision range Metallic neutral filters p.3 (can be used as beamsplitters) Dichroic beamsplitters p.39 Fresnel beam dividers p.30 Cube connectors p.9 Catalogue No. Catalogue No. Catalogue No. Size Visible 0% VIS/NIR 0% NIR/Telecom 0% Circular 2 BQ 00 2 BI 00 2 BX BQ 00 0 BI 00 0 BX Rectangular 16 BQ BI BX x BQ 16 2 BI 16 2 BX 16 2 x BQ 2 40 BI 2 40 BX 2 40 x BQ BI BX x 40 8 Standard range Mounting in camera filter rings (see p.80) Catalogue No. Catalogue No. Catalogue No. Catalogue No. Size Visible 0% Visible 33% VIS/NIR 0% NIR/Telecom 0% Circular 2 BV 00 2 BJ 00 2 BW BA 00 2 BD 00 2 BN 00 2 BL BA BA Rectangular 10 BV BJ BW x BV BJ BW x BV 16 2 BJ 16 2 BW 16 2 x BV 2 40 BJ 2 40 BW 2 40 x BV x BV 63 x BA BD BN BL x BA BD BN BL x BA 16 2 BD 16 2 BN 16 2 BL 16 2 x BA 2 40 BD 2 40 BN 2 40 BL 2 40 x BA BD BN BL x 40 3 BA 63 BD 63 BN 63 BL 63 x BA 160 x 3 Reflection (typical) Visble 33% Visble 0% Vis/NIR 0% NIR/Telecom 0% (nm) Coating specification Angle 4 Visible 0%: Reflectance 0 ± % Wavelength nm AR coating R < 1.2% average Visible 33%: Reflectance 33 ± % Wavelength nm AR coating R < 0.6% average VIS/NIR 0% Reflectance 0 ± 6% Wavelength nm AR coating R < 0.9% average NIR/Telecom 0% Reflectance 0 ± % Wavelength nm AR coating R < 0.6% Average Economy: Reflectance Polarisation ratio Substrate specification Precision range: (both sides) 40% nom. (visible) Rs/Rp = 2 (approx. for all types) λ/4 over 90% of aperture size +0, -0.1mm BK7 (see p.2) Standard and Economy ranges: (typical): 1mm thick 3mm thick (see p.2) 0.-1.λ over 10mm 1-2λ over 2mm ±0.3mm ( mm) ±0.mm (>mm) ±0.2mm B270 (NIR range) Float glass (others) Economy range Catalogue No. Size BT 63 x BT 160 x 3 20 BT x 160 3
Mirror Example Consider a concave mirror radius -10 cm then = = Now consider a 1 cm candle s = 15 cm from the vertex Where is the image.
Mirror Example Consider a concave mirror radius -10 cm then r 10 f = = = 5 cm 2 2 Now consider a 1 cm candle s = 15 cm from the vertex Where is the image 1 s 2 1 = = r s 1 1 2 + = = s s r 1 1 = 0.13333
Mirror Example Consider a concave mirror radius r = -10 cm then. Now consider a 1 cm candle s = 15 cm from the vertex Where is the image.
Mirror Example Consider a concave mirror radius r = -0 cm then r 0 f 5 cm 2 2 Now consider a cm candle s = 5 cm from the vertex Where is the image s 2 r s 2 s s r 0.3333 5 5 f s' 0.333 M ' s 7.5 Magnification
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