293:
132:, and produce colors in the same way as oil films on water. When light strikes an oil film at an angle, some of the light is reflected from the top surface of the oil, and some is reflected from the bottom surface where it is in contact with the water. Because the light reflecting from the bottom travels a slightly longer path, some light wavelengths are reinforced by this delay, while others tend to be canceled, producing the colors seen. The color transmitted by the filter exhibits a blue shift with increasing angle of incidence, see
20:
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of the filter can be tuned and made as wide or narrow as desired. Because unwanted wavelengths are reflected rather than absorbed, dichroic filters do not absorb this unwanted energy during operation and so do not become nearly as hot as the equivalent conventional filter (which attempts to absorb
367:
movies. The left lens of the Dolby 3D glasses transmits specific narrow bands of red, green and blue frequencies, while the right lens transmits a different set of red, green and blue frequencies. The projector uses matching filters to display the images meant for the left and right eyes.
246:
for this purpose, being originally designed for use in slide projectors to avoid melting the slides, but now widely used for interior home and commercial lighting. This improves whiteness by removing excess red; however, it poses a serious fire hazard if used in recessed or enclosed
380:
Dichroic filters have a much longer life than conventional filters; the color is intrinsic in the construction of the hard microscopic layers and cannot "bleach out" over the lifetime of the filter (unlike for example, gel filters). They can be fabricated to pass any
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substrate. The interfaces between the layers of different refractive index produce phased reflections, selectively reinforcing certain wavelengths of light and interfering with other wavelengths. The layers are usually added by
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389:
frequencies. Because light in the stopband is reflected rather than absorbed, there is much less heating of the dichroic filter than with conventional filters. Dichroics are capable of achieving extremely high
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Long-pass dichroic filters applied to ordinary lighting can prevent it from attracting insects. In some cases, such filters can prevent attraction of other wildlife, reducing adverse environmental impact.
452:
282:
to direct illumination of an excitation frequency toward the sample and then at an analyzer to reject that same excitation frequency but pass a particular emission frequency.
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projectors typically transmit a white light source through a color wheel which uses dichroic filters to rapidly switch colors sent through the (monochrome)
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268:
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use dichroic filters instead of prisms to split the white light from the lamp into the three colours before passing it through the three LCD units.
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is used instead. For cameras, however, it is now more common to have an absorption filter array to filter individual pixels on a single CCD array.
238:
light to pass out of the rear of the fixture. Such an arrangement allows intense illumination with less heating of the illuminated object. Many
296:
Six-segment dichroic color wheel from a DLP projector. Segments transmit red, green and blue, and therefore reflect cyan, magenta, and yellow.
102:
effects that take place between the incident and reflected waves at the thin-film boundaries. The principle of operation is similar to a
456:
611:
315:. They separate the various harmonic components of frequency doubled laser systems by selective spectral reflection and transmission.
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is occasionally fabricated to behave as a dichroic filter. Because the wavelength of light selected by the filter varies with the
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are the same type of device, but are characterized by the colors of light that they reflect, rather than the colors they pass.
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material having different refractive indices. There may also be metallic layers. Interference filters are
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for high-power lighting products. Pictures are made by overlapping up to four colored dichroic filters.
308:. Newer projectors may use laser or LED light sources to directly emit the desired light wavelengths.
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are commonly used behind a light source to reflect visible light forward while allowing the invisible
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52:
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526:"Understanding, Assessing, and Resolving Light-Pollution Problems on Sea Turtle Nesting Beaches"
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is being deliberately separated into various color bands (for example, within a color
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that are unsuitable for use with dichroic reflector lights can be identified by the
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Moreno, Ivan; Araiza, JJ; Avendano-Alejo, M (2005). "Thin-film spatial filters".
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79:, or band-rejection. They are used in scientific applications, as well as in
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filters can filter light from a white light source to produce light that is
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In a dichroic mirror or filter, instead of using an oil film to produce the
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394:, and are used for all the mirrors on the world's most powerful laser, the
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535:(3rd ed.). Florida Fish and Wildlife Conservation Commission: 23.
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radiation into those luminaires. For these applications non-cool-beam (
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operate on the same principle, but focus exclusively on reflection.
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26:
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use dichroic filters to adjust the color balance in the print.
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for all wavelengths of interest. An interference filter may be
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swing. Another interesting application of dichroic filters is
160:. By controlling the thickness and number of the layers, the
90:
An interference filter consists of multiple thin layers of
533:
Florida Marine
Research Institute Technical Report TR-2
23:
Band-pass interference filter for laser experiments
169:all energy except for that in the passband). (See
524:Witherington, Blair E.; Martin, R. Erik (2003).
173:for a mathematical description of the effect.)
385:frequency and block a selected amount of the
8:
344:effect, changing color as the (for example)
263:) lamps must be used. Recessed or enclosed
490:"Dolby Stakes Its Claim in 3D Movie Tech"
318:Dichroic filters are also used to create
340:of the light, such jewelry often has an
444:
606:(4th ed.). Taylor & Francis.
211:in color. Such filters are popular in
128:Dichroic filters use the principle of
591:(2nd ed.) pp. 42.89-42.90 (1995)
63:and transmits others, with almost no
7:
363:uses dichroic filters for screening
16:Wavelength-selective optical filter
14:
488:Shankland, Stephen (2007-10-09).
563: This article incorporates
558:
576:General Services Administration
355:With a technique licensed from
278:, dichroic filters are used as
1:
244:integrated dichroic reflector
230:Dichroic reflectors known as
226:IEC 60598 No Cool Beam symbol
453:"The Copenhagen Opera House"
98:-selective by virtue of the
271:60598 No Cool Beam symbol.
689:
602:MacLeod, H. Angus (2010).
423:Holographic Versatile Disc
396:National Ignition Facility
306:Digital micromirror device
171:Fabry–Pérot interferometer
604:Thin-Film Optical Filters
313:laser harmonic separators
143:, alternating layers of
392:laser damage thresholds
276:fluorescence microscopy
207:by humans to be highly
186:color television camera
571:Federal Standard 1037C
565:public domain material
428:Thin-film interference
325:Photographic enlarger
297:
227:
130:thin-film interference
32:
24:
295:
225:
30:
22:
643:10.1364/OL.30.000914
240:quartz-halogen lamps
151:are built up upon a
635:2005OptL...30..914M
114:dichroic reflectors
85:theatrical lighting
37:interference filter
589:Handbook of Optics
552:Additional sources
338:angle of incidence
298:
228:
149:refractive indices
118:Dielectric mirrors
104:Fabry-Perot etalon
33:
25:
413:Dielectric mirror
350:spatial filtering
311:They are used as
158:vacuum deposition
134:Dielectric mirror
680:
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578:. Archived from
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502:. Archived from
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455:. Archived from
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433:Thin-film optics
145:optical coatings
110:Dichroic mirrors
45:thin-film filter
31:Dichroic filters
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668:Optical filters
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596:Further reading
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500:CBS Interactive
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418:Filter (optics)
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332:Artistic glass
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188:), the similar
182:video projector
147:with different
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41:dichroic filter
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623:Optics Letters
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582:on 2022-01-22.
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477:Optics Letters
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287:LCD projectors
280:beam splitters
219:applications.
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190:dichroic prism
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49:optical filter
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506:on 2012-02-24
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673:Interference
629:(8): 914–6.
626:
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580:the original
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508:. Retrieved
504:the original
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461:. Retrieved
457:the original
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251:by allowing
232:cold mirrors
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196:Applications
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141:interference
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127:
113:
109:
108:
100:interference
89:
59:(colors) of
44:
40:
36:
34:
327:color heads
178:white light
57:wavelengths
662:Categories
510:2016-12-08
463:2009-09-04
439:References
376:Advantages
361:Dolby Labs
342:iridescent
265:luminaires
261:Silverback
249:luminaires
217:theatrical
96:wavelength
92:dielectric
65:absorption
587:M. Bass,
541:1092-194X
408:Color gel
209:saturated
205:perceived
162:frequency
69:high-pass
651:15865397
402:See also
387:stopband
383:passband
346:earrings
253:infrared
242:have an
236:infrared
201:Dichroic
166:passband
77:bandpass
73:low-pass
53:reflects
631:Bibcode
357:Infitec
334:jewelry
164:of the
649:
610:
539:
300:Older
176:Where
124:Theory
47:is an
567:from
529:(PDF)
320:gobos
285:Some
153:glass
61:light
55:some
51:that
43:, or
647:PMID
608:ISBN
537:ISSN
495:CNET
215:and
112:and
83:and
639:doi
302:DLP
274:In
269:IEC
259:or
257:ALU
184:or
35:An
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365:3D
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
