Parabolic Mirrors Off-Axis

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Function

A parabolic mirror is fully corrected to focus a point source to infinity or to bring light from infinity to a point focus. Parabolic surfaces are widely used components in instruments from spectrometers to observatory telescopes. Lambda/Ten Optics manufactures precise fully-documented parabolic segments from Schott Optical Glass low-expansion Zerodur. These mirrors may be used with confidence in the most critical applications.

Applications

Collimators
Telescopes
Spectroscopic Systems
Radiometric Instruments
Fourier Optics
Schlieren Optics
Interferometers
MTF Systems
Beam Expanders
Optical Test Stations
Bore Sight Telescopes
Laser divergence measurements

Design Benefits

These parabolic segments are "off-axis" and thus do not include the optical center of the mirror. There is no central obscuration in the collimated bundle of light. Segments of diameters up to 12 inches (305 mm) are cut from the larger centered parabolic parent mirrors. Larger diameter segments are fabricated without the surrounding parent by a "stand alone" method. Smaller segments (up to 12 inches, 305 mm) are wedge shaped and have a back surface very nearly perpendicular to the optical axis. Larger segments have uniform edge thickness and must be mounted inclined to the optical axis.

Specifications

Optical Surface Accuracy

Focal length less than 40"(one meter) - 1/ 8 wave peak to valley at 6328 A over 95% of clear aperture area
Focal length 40"(one meter) and longer - 1/10 wave peak to valley at 6328 A over 95% of clear aperture area

Optical Surface Slope Error

Focal length less than 40"(one meter) - 1/8 wave per inch (25.4 mm) at 6328 A over 95% of clear aperture area
Focal length 40"(one meter) and longer - 1 /1 0 wave per inch(25.4 mm) at 6328A over 95% of clear aperture area

Optical Surface Quality: 60-40

Material: Zerodur

Focal Length Tolerance: +/- 1/2%

Off-axis distance Tolerance

+/- .025" (0.64 mm) for diameters < 12 inches (305 mm)
+/- .100" (0.25 mm) for diameters > 12 inches (305 mm)

Diameter Tolerance

+ 000 - .005 < 12 inches (305 mm)
+ 000 - .010 > 12 inches (305 mm)

Standard Coating specification: Meets MIL-M-13508C for hardness, adherence, temperature and humidity. (Protected aluminum and silver) (other coatings on request)

Documentation: Surface accuracy certified by computer reduced phase shifted interferograms, spectral reflectivity curves and coating witness sample provided on diameter >6 inches - 152 mm), as built measurements of dimensional attributes, alignment instructions

Optional Features

Larger apertures
Special coating requirements
Higher surface accuracies
Alternative focal lengths

Lambda/Ten Optics can mount and qualify the parabolic mirrors in an optical mount of customer's choice.

PMOA Models

PM-OA Model # Focal/ Length Diameter Off-Axis Distance Clear Aperture Edge Thickness Inside Edge Thickness Outside

12-2-3 12 in. 2 in. 3.0 in. 1.8 in. 1.16 in. 1.41 in.

305 mm 51 mm 76 mm 46 mm 29 mm 36 mm

12-2-2.5 12 in. 3 in. 2.5 in. 2.8 in. 1.10 in. 1.41 in.

305 mm 76 mm 64 mm 71 mm 28 mm 36 mm

20-2-4 20 in. 2 in. 4.0 in. 1.8 in. 1.73 in. 1.93 in.

508 mm 51 mm 102 mm 46 mm 44 mm 49 mm

20-3-3.5 20 in. 3 in. 3.5 in. 2.8 in. 1.67 in. 1.93 in.

508 mm 76 mm 89 mm 71 mm 42 mm 49 mm

20-4-3 20 in. 4 in. 3 in. 3.8 in. 1.63 in. 1.93 in.

508 mm 102 mm 76 mm 97 mm 41 mm 49 mm

30-4-7.5 30 in. 4 in. 7.5 in. 3.8 in. 1.62 in. 2.12 in.

762 mm 102 mm 191 mm 97 mm 41 mm 54 mm

30-6-6.5 30 in. 6 in. 6.5 in. 5.8 in. 1.47 in. 2.12 in.

762 mm 152 mm 165 mm 147 mm 37 mm 54 mm

30-8-5.5 30 in. 8 in. 5.5 in. 7.8 in. 1.39 in. 2.12 in.

762 mm 203 mm 140 mm 198 mm 35 mm 54 mm

40-4-7.5 40 in. 4 in. 7.5 in. 3.8 in. 1.76 in. 2.14 in.

1016 mm 102 mm 191 mm 97 mm 45 mm 54 mm

40-6-6.5 40 in. 6 in. 6.5 in. 5.8 in. 1.65 in. 2.14 in.

1016 mm 152 mm 165 mm 147 mm 42 mm 54 mm

40-8-5.5 40 in. 8 in. 5.5 in. 7.8 in. 1.59 in. 2.14 in.

1016 mm 203 mm 140 mm 198 mm 40 mm 54 mm

60-4-10 60 in. 4 in. 10.0 in. 3.8 in. 1.82 in. 2.15 in.

1524 mm 102 mm 254 mm 97 mm 46 mm 55 mm

60-6-7 60 in. 6 in. 7.0 in. 5.8 in. 1.62 in. 1.97 in.

1524 mm 152 mm 178 mm 147 mm 41 mm 50 mm

60-6-9 60 in. 6 in. 9.0 in. 5.8 in. 1.70 in. 2.15 in.

1524 mm 152 mm 229 mm 147 mm 43 mm 55 mm

60-6-11 60 in. 6 in. 11.0 in. 5.8 in. 2.39 in. 2.94 in.

1524 mm 152 mm 279 mm 147 mm 61 mm 75 mm

60-8-8 60 in. 8 in. 8.0 in. 7.8 in. 1.62 in. 2.15 in.

1524 mm 203 mm 203 mm 198 mm 41 mm 55 mm

60-8-10 60 in. 8 in. 10.0 in. 7.8 in. 1.62 in. 2.94 in.

1524 mm 203 mm 254 mm 198 mm 41 mm 75 mm

60-10-7 60 in. 10 in. 7.0 in. 9.75 in. 1.57 in. 2.15 in.

1524 mm 254 mm 178 mm 248 mm 40 mm 55 mm

60-10-9 60 in. 10 in. 9.0 in. 9.75 in. 2.19 in. 2.94 in.

1524 mm 254 mm 229 mm 248 mm 56 mm 75 mm

60-12-8 60 in. 12 in. 8.0 in. 11.75 in. 2.14 in. 2.94 in.

1524 mm 305 mm 203 mm 298 mm 54 mm 75 mm

80-4-10 80 in. 4 in. 10.0 in. 3.8 in. 1.91 in. 2.16 in.

2032 mm 102 mm 254 mm 97 mm 49 mm 55 mm

80-6-7 80 in. 6 in. 7.0 in. 5.8 in. 1.76 in. 2.02 in.

2032 mm 152 mm 178 mm 147 mm 45 mm 51 mm

80-6-9 80 in. 6 in. 9.0 in. 5.8 in. 1.84 in. 2.16 in.

2032 mm 152 mm 229 mm 147 mm 47 mm 55 mm

80-6-11 80 in. 6 in. 11.0 in. 5.8 in. 2.54 in. 2.96 in.

2032 mm 152 mm 279 mm 147 mm 65 mm 75 mm

80-8-8 80 in. 8 in. 8.0 in. 7.8 in. 1.76 in. 2.16 in.

2032 mm 203 mm 203 mm 198 mm 45 mm 55 mm

80-8-10 80 in. 8 in. 10.0 in. 7.8 in. 2.46 in. 2.96 in.

2032 mm 203 mm 254 mm 198 mm 62 mm 75 mm

80-10-7 80 in. 10 in. 7.0 in. 9.75 in. 1.72 in. 2.16 in.

2032 mm 254 mm 178 mm 248 mm 44 mm 55 mm

80-10-9 80 in. 10 in. 9.0 in. 9.75 in. 2.39 in. 2.96 in.

2032 mm 254 mm 229 mm 248 mm 61 mm 75 mm

80-12-8 80 in. 12 in. 8.0 in. 11.75 in. 2.36 in. 2.96 in.

2032 mm 305 mm 203 mm 298 mm 60 mm 75 mm

100-6-7 100 in. 6 in. 7.0 in. 5.8 in. 1.85 in. 2.06 in.

2540 mm 152 mm 178 mm 147 mm 47 mm 52 mm

100-6-9 100 in. 6 in. 9.0 in. 5.8 in. 1.90 in. 2.17 in.

2540 mm 152 mm 229 mm 147 mm 48 mm 55 mm

100-6-11 100 in. 6 in. 11.0 in. 5.8 in. 2.63 in. 2.96 in.

2540 mm 152 mm 279 mm 147 mm 67 mm 75 mm

100-8-8 100 in. 8 in. 8.0 in. 7.8 in. 1.85 in. 2.17 in.

2540 mm 203 mm 203 mm 198 mm 47 mm 55 mm

100-8-10 100 in. 8 in. 10.0 in. 7.8 in. 2.56 in. 2.96 in.

2540 mm 203 mm 254 mm 198 mm 65 mm 75 mm

100-10-7 100 in. 10 in. 7.0 in. 9.75 in. 1.82 in. 2.17 in.

2540 mm 254 mm 178 mm 248 mm 46 mm 55 mm

100-10-9 100 in. 10 in. 9.0 in. 9.75 in. 2.51 in. 2.96 in.

2540 mm 254 mm 229 mm 248 mm 64 mm 75 mm

100-12-8 100 in. 12 in. 8.0 in. 11.75 in. 2.48 in. 2.96 in.

2540 mm 305 mm 203 mm 298 mm 63 mm 75 mm

The above priced with protected aluminum coatings.

Larger diameters priced on request.

Lambda/Ten Optics

7A Stuart Road, Chelmsford, MA 01824

Telephone (978) 250-8649 Fax (978) 250-8682 E-Mail lambdaten@mcphersoninc.com

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PM-OA Model #	Focal/ Length	Diameter	Off-Axis Distance	Clear Aperture	Edge Thickness Inside	Edge Thickness Outside

12-2-3	12 in.	2 in.	3.0 in.	1.8 in.	1.16 in.	1.41 in.
	305 mm	51 mm	76 mm	46 mm	29 mm	36 mm


12-2-2.5	12 in.	3 in.	2.5 in.	2.8 in.	1.10 in.	1.41 in.
	305 mm	76 mm	64 mm	71 mm	28 mm	36 mm


20-2-4	20 in.	2 in.	4.0 in.	1.8 in.	1.73 in.	1.93 in.
	508 mm	51 mm	102 mm	46 mm	44 mm	49 mm


20-3-3.5	20 in.	3 in.	3.5 in.	2.8 in.	1.67 in.	1.93 in.
	508 mm	76 mm	89 mm	71 mm	42 mm	49 mm


20-4-3	20 in.	4 in.	3 in.	3.8 in.	1.63 in.	1.93 in.
	508 mm	102 mm	76 mm	97 mm	41 mm	49 mm


30-4-7.5	30 in.	4 in.	7.5 in.	3.8 in.	1.62 in.	2.12 in.
	762 mm	102 mm	191 mm	97 mm	41 mm	54 mm


30-6-6.5	30 in.	6 in.	6.5 in.	5.8 in.	1.47 in.	2.12 in.
	762 mm	152 mm	165 mm	147 mm	37 mm	54 mm


30-8-5.5	30 in.	8 in.	5.5 in.	7.8 in.	1.39 in.	2.12 in.
	762 mm	203 mm	140 mm	198 mm	35 mm	54 mm


40-4-7.5	40 in.	4 in.	7.5 in.	3.8 in.	1.76 in.	2.14 in.
	1016 mm	102 mm	191 mm	97 mm	45 mm	54 mm


40-6-6.5	40 in.	6 in.	6.5 in.	5.8 in.	1.65 in.	2.14 in.
	1016 mm	152 mm	165 mm	147 mm	42 mm	54 mm


40-8-5.5	40 in.	8 in.	5.5 in.	7.8 in.	1.59 in.	2.14 in.
	1016 mm	203 mm	140 mm	198 mm	40 mm	54 mm


60-4-10	60 in.	4 in.	10.0 in.	3.8 in.	1.82 in.	2.15 in.
	1524 mm	102 mm	254 mm	97 mm	46 mm	55 mm


60-6-7	60 in.	6 in.	7.0 in.	5.8 in.	1.62 in.	1.97 in.
	1524 mm	152 mm	178 mm	147 mm	41 mm	50 mm


60-6-9	60 in.	6 in.	9.0 in.	5.8 in.	1.70 in.	2.15 in.
	1524 mm	152 mm	229 mm	147 mm	43 mm	55 mm


60-6-11	60 in.	6 in.	11.0 in.	5.8 in.	2.39 in.	2.94 in.
	1524 mm	152 mm	279 mm	147 mm	61 mm	75 mm


60-8-8	60 in.	8 in.	8.0 in.	7.8 in.	1.62 in.	2.15 in.
	1524 mm	203 mm	203 mm	198 mm	41 mm	55 mm


60-8-10	60 in.	8 in.	10.0 in.	7.8 in.	1.62 in.	2.94 in.
	1524 mm	203 mm	254 mm	198 mm	41 mm	75 mm


60-10-7	60 in.	10 in.	7.0 in.	9.75 in.	1.57 in.	2.15 in.
	1524 mm	254 mm	178 mm	248 mm	40 mm	55 mm


60-10-9	60 in.	10 in.	9.0 in.	9.75 in.	2.19 in.	2.94 in.
	1524 mm	254 mm	229 mm	248 mm	56 mm	75 mm


60-12-8	60 in.	12 in.	8.0 in.	11.75 in.	2.14 in.	2.94 in.
	1524 mm	305 mm	203 mm	298 mm	54 mm	75 mm


80-4-10	80 in.	4 in.	10.0 in.	3.8 in.	1.91 in.	2.16 in.
	2032 mm	102 mm	254 mm	97 mm	49 mm	55 mm


80-6-7	80 in.	6 in.	7.0 in.	5.8 in.	1.76 in.	2.02 in.
	2032 mm	152 mm	178 mm	147 mm	45 mm	51 mm


80-6-9	80 in.	6 in.	9.0 in.	5.8 in.	1.84 in.	2.16 in.
	2032 mm	152 mm	229 mm	147 mm	47 mm	55 mm


80-6-11	80 in.	6 in.	11.0 in.	5.8 in.	2.54 in.	2.96 in.
	2032 mm	152 mm	279 mm	147 mm	65 mm	75 mm


80-8-8	80 in.	8 in.	8.0 in.	7.8 in.	1.76 in.	2.16 in.
	2032 mm	203 mm	203 mm	198 mm	45 mm	55 mm


80-8-10	80 in.	8 in.	10.0 in.	7.8 in.	2.46 in.	2.96 in.
	2032 mm	203 mm	254 mm	198 mm	62 mm	75 mm


80-10-7	80 in.	10 in.	7.0 in.	9.75 in.	1.72 in.	2.16 in.
	2032 mm	254 mm	178 mm	248 mm	44 mm	55 mm


80-10-9	80 in.	10 in.	9.0 in.	9.75 in.	2.39 in.	2.96 in.
	2032 mm	254 mm	229 mm	248 mm	61 mm	75 mm


80-12-8	80 in.	12 in.	8.0 in.	11.75 in.	2.36 in.	2.96 in.
	2032 mm	305 mm	203 mm	298 mm	60 mm	75 mm


100-6-7	100 in.	6 in.	7.0 in.	5.8 in.	1.85 in.	2.06 in.
	2540 mm	152 mm	178 mm	147 mm	47 mm	52 mm


100-6-9	100 in.	6 in.	9.0 in.	5.8 in.	1.90 in.	2.17 in.
	2540 mm	152 mm	229 mm	147 mm	48 mm	55 mm


100-6-11	100 in.	6 in.	11.0 in.	5.8 in.	2.63 in.	2.96 in.
	2540 mm	152 mm	279 mm	147 mm	67 mm	75 mm


100-8-8	100 in.	8 in.	8.0 in.	7.8 in.	1.85 in.	2.17 in.
	2540 mm	203 mm	203 mm	198 mm	47 mm	55 mm


100-8-10	100 in.	8 in.	10.0 in.	7.8 in.	2.56 in.	2.96 in.
	2540 mm	203 mm	254 mm	198 mm	65 mm	75 mm


100-10-7	100 in.	10 in.	7.0 in.	9.75 in.	1.82 in.	2.17 in.
	2540 mm	254 mm	178 mm	248 mm	46 mm	55 mm


100-10-9	100 in.	10 in.	9.0 in.	9.75 in.	2.51 in.	2.96 in.
	2540 mm	254 mm	229 mm	248 mm	64 mm	75 mm


100-12-8	100 in.	12 in.	8.0 in.	11.75 in.	2.48 in.	2.96 in.
	2540 mm	305 mm	203 mm	298 mm	63 mm	75 mm