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Spherical Concave Mirror Substrates

The substrates are used to manufacture concave mirrors.

We offer substrates either made of borosilicate glass (Duran) or of glass ceramics (Zerodur). Duran is the more economical version an is offered with surface deviations of λ/4 and λ/10. Zerodur has a low coefficient of thermal expansion which makes the material suited for mirrors with even lower surface deviations (λ/10 and λ/20).

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Description

The substrates are used to manufacture concave mirrors.

We offer substrates either made of borosilicate glass (Duran) or of glass ceramics (Zerodur). Duran is the more economical version an is offered with surface deviations of λ/4 and λ/10. Zerodur has a low coefficient of thermal expansion which makes the material suited for mirrors with even lower surface deviations (λ/10 and λ/20).

The prices for concave mirrors are valid for aperture ratios (diameter over focal length) of 1:10 to 1:3. The feasible focal length are determined by the available radius tools.

The substrates themselves are not coated. To be used as high reflective mirror a coating must me applied which suits the desired wavelength range.

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Optical specifications

material	Duran	Zerodur
flatness	<λ/4 or <λ/10	<λ/10 or <λ/20
coefficient of thermal expansion	3·10^-6/K	<0,15·10^-6/K
rear and edge surface	fine ground (opaque)	fine ground (opaque)

Standard dimensions

Diameter [mm]	Thickness [mm]	Art. No. λ/4 Duran	Art. No. λ/10 Duran	Art. No. λ/10 Zerodur	Art. No. λ/20 Zerodur
10	2	SHD 4.010	SHD 1.010	SHZ 1.010	SHZ 2.010
20	3	SHD 4.020	SHD 1.020	SHZ 1.020	SHZ 2.020
25	4	SHD 4.025	SHD 1.025	SHZ 1.025	SHZ 2.025
30	4	SHD 4.030	SHD 1.030	SHZ 1.030	SHZ 2.030
40	5	SHD 4.040	SHD 1.040	SHZ 1.040	SHZ 2.040
50	7	SHD 4.050	SHD 1.050	SHZ 1.050	SHZ 2.050
60	8	SHD 4.060	SHD 1.060	SHZ 1.060	SHZ 2.060
70	10	SHD 4.070	SHD 1.070	SHZ 1.070	SHZ 2.070
80	12	SHD 4.080	SHD 1.080	SHZ 1.080	SHZ 2.080
100	15	SHD 4.100	SHD 1.100	SHZ 1.100	SHZ 2.100
120	16	SHD 4.120	SHD 1.120	SHZ 1.120	SHZ 2.120
150	20	SHD 4.150	SHD 1.150	SHZ 1.150	SHZ 2.150
180	24	SHD 4.180	SHD 1.180	SHZ 1.180	SHZ 2.180
200	27	SHD 4.200	SHD 1.200	SHZ 1.200	SHZ 2.200
250	33	SHD 4.250	SHD 1.250	SHZ 1.250	SHZ 2.250

other shapes (quadratic, rectangular, or per specification)	on request
other materials	on request
aluminum coating with quartz protection layer for visible range	on request
aluminum coating without protection layer	on request
aluminum coating with MgF₂ protection for UV range	on request
silver coating with stable protection for visible range	on request
dielectric coatings	on request

Spherical Concave Mirror Substrates

Description

B. Halle Nachfl. GmbH

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