Optical Flats

We manufacture a full range of Optical Flats from 25mm diameter up to 600mm diameter. Optical Flats are precision polished flat surfaces used as a reference to determine the flatness of a surface that needs to be tested.

We offer these in Fused Quartz or SCHOTT ZERODUR® to a flatness specification of both single-sided and double-sided lambda/4, lambda/8, lambda/16 and lambda/20, depending on the size of the optic.

All our Optical Flats are supplied in a wooden storage box with interferograms. Other sizes and custom shapes, such as rectangles and donuts, are available on request. We hold a range of Optical Flats in stock that are available for immediate shipping.

Single-Sided Optical Flats

Diameter	Thickness	Flatness						Lead Time
Diameter	Thickness	λ/2	λ/4	λ/8	λ/10	λ/16	λ/20	Lead Time
26	6	N/A	£72	£73	£77	£92	£100	1 week
26	10	N/A	£76	£78	£80	£96	£107	1 week
52	10	N/A	£92	£95	£97	£113	£131	1 week
77	15	N/A	£134	£139	£142	£163	£170	1 week
102	17	N/A	£186	£191	£198	£220	£234	1 week
127	20	N/A	£268	£276	£283	£319	£354	1 week
152	25	N/A	£412	£424	£439	£461	£517	1 week
202	30	£754	£776	£847	£864	£978	£1,588	1 week
252	35	£1,099	£1,134	£1,205	£1,232	£1,835	£2,530	1 week
302	40	£1,966	£2,027	£2,119	£2,239	£2,969	£4,202	1 week
332	40	£3,286	£3,388	£3,671	£3,812	TBQ	N/A	12 weeks
352	50	£4,117	£4,244	£4,669	£4,811	N/A	N/A	12 weeks
402	55	£4,960	£5,668	£6,335	£6,476	N/A	N/A	2 weeks
452	55	£6,803	£7,511	£8,645	N/A	N/A	N/A	12 weeks
502	60	£8,928	£9,850	£11,125	N/A	N/A	N/A	4 weeks
552	60	£12,613	TBQ	TBQ	N/A	N/A	N/A	12 weeks
602	60	£16,652	TBQ	TBQ	N/A	N/A	N/A	4 weeks

Double-Sided Optical Flats

Diameter	Thickness	Flatness						Lead Time
Diameter	Thickness	λ/2	λ/4	λ/8	λ/10	λ/16	λ/20	Lead Time
26	6	N/A	£95	£97	£102	£120	£134	1 week
26	10	N/A	£101	£103	£107	£128	£139	1 week
52	10	N/A	£114	£118	£120	£139	£163	1 week
77	15	N/A	£160	£164	£170	£210	£220	1 week
102	17	N/A	£220	£227	£248	£269	£298	1 week
127	20	N/A	£312	£322	£340	£418	£464	1 week
152	25	N/A	£548	£565	£595	£631	£702	1 week
202	30	£850	£876	£1,018	£1,034	£1,219	£2,352	1 week
252	35	£1,224	£1,261	£1,403	£1,481	£2,430	£4,039	1 week
302	40	£2,543	£2,622	£2,764	£2,905	£4,769	£6,044	1 week
332	40	£4,110	£4,237	£4,805	£5,088	TBQ	N/A	12 weeks
352	50	£5,224	£5,386	£6,235	£6,520	N/A	N/A	12 weeks
402	55	£5,809	£7,226	£8,078	£8,362	N/A	N/A	2 weeks
452	55	£8,220	£9,354	£10,913	N/A	N/A	N/A	12 weeks
502	60	£10,133	£11,975	£14,101	N/A	N/A	N/A	4 weeks
552	60	£14,172	TBQ	TBQ	N/A	N/A	N/A	12 weeks
602	60	£19,487	TBQ	TBQ	N/A	N/A	N/A	4 weeks

Recalibration and Refurbishment

Further to our range of Optical Flats we also offer recalibration and refurbishment services on any Optical Flat, it does not need to be initially purchased from us. Optical Flats may get damaged over time and include chips and/or scratches that will affect the accuracy of testing.

All recalibrations are supplied with interferograms. If the Optical Flat cannot be recalibrated due to being out of flatness specification, or if the surfaces have so many scratches that we cannot achieve a suitable flatness reading, then we can offer a refurbishment service.

Refurbishments are generally used when the damage to the Optical Flat is too significant for recalibration. This would include chips and/or deep scratches. We grind the surfaces and chips then polish the Optical Flat to the required flatness specification. All refurbishments are supplied with interferograms. Refurbishment is more suitable and cost effective for medium to large Optical Flats.

Optical Flats

Single-Sided Optical Flats

Double-Sided Optical Flats

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