133:
36:
332:
202:, since the shape of the optics can be maintained correctly all the way to the edge of the aperture, whilst mechanical polishing techniques tend to have trouble with distortion of the polishing tool when it overhangs the edge. The first major use of ion figuring was in making the mirror segments for the
170:
shapes needed to form the correct image. It is done by applying different polishing stroke lengths with different sized and shaped tools. Manual figuring is a very laborious process, since the heat produced by polishing has to be allowed to dissipate before the shape of the mirror can be measured
274:
373:
151:
of an optical surface to remove imperfections or modify the surface curvature to achieve the shape required for a given application.
302:
119:
248:
57:
198:
is used to remove material from the optics in a very controlled way. This is particularly useful in the manufacture of
100:
72:
236:
46:
392:
366:
53:
79:
180:
172:
137:
86:
166:
in a process of converting the smooth spherical mirror produced by earlier stages into the aspherical or
402:
359:
282:
160:
68:
167:
191:
308:
171:
again, and the places for later polishing selected. Testing of the figure is usually done by a
298:
343:
290:
199:
397:
210:
252:
286:
132:
203:
184:
163:
93:
386:
312:
281:. Vol. 10829. International Society for Optics and Photonics. p. 1082907.
214:
195:
176:
35:
148:
331:
294:
220:
Issues for ion beam figuring included re-sputtering and contamination.
17:
275:"Basics of ion beam figuring and challenges for real optics treatment"
339:
209:
The ultra-high precision requirements for optical surfaces for
29:
279:
Fifth
European Seminar on Precision Optics Manufacturing
347:
60:. Unsourced material may be challenged and removed.
237:The Photographic times, page 18, Volume 38 - 1906
277:. In Rascher, Rolf; Schopf, Christian (eds.).
367:
8:
374:
360:
120:Learn how and when to remove this message
131:
229:
159:An example of figuring is that used in
27:Final polishing of an optical surface
7:
328:
326:
58:adding citations to reliable sources
346:. You can help Knowledge (XXG) by
194:is often used, in which a neutral
25:
330:
249:"ITT Corporation - Ion Figuring"
34:
45:needs additional citations for
273:Schaefer, David (2018-08-07).
187:on research telescope optics.
136:Polishing and figuring of the
1:
217:often require ion figuring.
183:and with very sophisticated
419:
325:
181:amateur telescope making
173:Foucault knife-edge test
147:is the process of final
342:-related article is a
141:
138:Hubble Space Telescope
213:and deep-ultraviolet
135:
161:reflecting telescope
54:improve this article
287:2018SPIE10829E..07S
190:For large mirrors,
295:10.1117/12.2318572
142:
355:
354:
200:segmented mirrors
140:'s primary mirror
130:
129:
122:
104:
16:(Redirected from
410:
393:Glass production
376:
369:
362:
334:
327:
317:
316:
270:
264:
263:
261:
260:
251:. Archived from
245:
239:
234:
125:
118:
114:
111:
105:
103:
62:
38:
30:
21:
418:
417:
413:
412:
411:
409:
408:
407:
383:
382:
381:
380:
323:
321:
320:
305:
272:
271:
267:
258:
256:
247:
246:
242:
235:
231:
226:
211:X-ray astronomy
164:primary mirrors
157:
126:
115:
109:
106:
63:
61:
51:
39:
28:
23:
22:
15:
12:
11:
5:
416:
414:
406:
405:
400:
395:
385:
384:
379:
378:
371:
364:
356:
353:
352:
335:
319:
318:
303:
265:
240:
228:
227:
225:
222:
204:Keck telescope
156:
153:
128:
127:
42:
40:
33:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
415:
404:
401:
399:
396:
394:
391:
390:
388:
377:
372:
370:
365:
363:
358:
357:
351:
349:
345:
341:
336:
333:
329:
324:
314:
310:
306:
304:9781510622708
300:
296:
292:
288:
284:
280:
276:
269:
266:
255:on 2007-10-20
254:
250:
244:
241:
238:
233:
230:
223:
221:
218:
216:
212:
207:
205:
201:
197:
193:
188:
186:
182:
178:
174:
169:
165:
162:
154:
152:
150:
146:
139:
134:
124:
121:
113:
110:February 2009
102:
99:
95:
92:
88:
85:
81:
78:
74:
71: –
70:
66:
65:Find sources:
59:
55:
49:
48:
43:This article
41:
37:
32:
31:
19:
403:Optics stubs
348:expanding it
337:
322:
278:
268:
257:. Retrieved
253:the original
243:
232:
219:
208:
192:ion figuring
189:
185:null testers
158:
144:
143:
116:
107:
97:
90:
83:
76:
64:
52:Please help
47:verification
44:
215:lithography
196:atomic beam
177:Ronchi test
387:Categories
259:2008-02-12
224:References
80:newspapers
69:"Figuring"
313:139240076
168:parabolic
149:polishing
145:Figuring
283:Bibcode
94:scholar
18:Figured
398:Optics
340:optics
311:
301:
96:
89:
82:
75:
67:
338:This
309:S2CID
155:Types
101:JSTOR
87:books
344:stub
299:ISBN
73:news
291:doi
179:in
175:or
56:by
389::
307:.
297:.
289:.
206:.
375:e
368:t
361:v
350:.
315:.
293::
285::
262:.
123:)
117:(
112:)
108:(
98:·
91:·
84:·
77:·
50:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
