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Science Forum Index » Optics Forum » low dispersion, high reflectivity mirrors
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| Sam |
 Posted: Thu Nov 13, 2003 1:14 am |
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Guest
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Hi Everyone.
I am hoping to undertake a new experiment to resonate short optical
pulses (50-200 fs) in a Fabry-Perot cavity. I am interested in
purchasing a couple of mirrors that have a relatively low dispersion
coating but sufficient reflectivity to enable a Finesse of order 10^4
or 10^5. Commercial mirrors (such as those from CVI) seem to only
offer a Finesse of a few thousand. Would anyone know of an optics
company that is already providing high finesse low dispersion mirrors
or of an organisation that is willing to custom make optics that can
achieve these types of specifications?
Is there any intrinsic reason that low dispersion mirrors must exhibit
lower reflectivity or is it just that "super-mirror" polishing
technology has not been employed in low dispersion mirrors to date? |
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| Repeating Decimal |
| Posted: Thu Nov 13, 2003 6:50 pm |
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Guest
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in article ca8d8bd7.0311122214.6d654de5@posting.google.com, Sam at
samueldawkins@hotmail.com wrote on 11/12/03 10:14 PM:
Quote: Hi Everyone.
I am hoping to undertake a new experiment to resonate short optical
pulses (50-200 fs) in a Fabry-Perot cavity. I am interested in
purchasing a couple of mirrors that have a relatively low dispersion
coating but sufficient reflectivity to enable a Finesse of order 10^4
or 10^5. Commercial mirrors (such as those from CVI) seem to only
offer a Finesse of a few thousand. Would anyone know of an optics
company that is already providing high finesse low dispersion mirrors
or of an organisation that is willing to custom make optics that can
achieve these types of specifications?
Is there any intrinsic reason that low dispersion mirrors must exhibit
lower reflectivity or is it just that "super-mirror" polishing
technology has not been employed in low dispersion mirrors to date?
Try finding out what the LIGO project is using. They are pushing the
envelope on many optical components.
Bill |
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| Rene Tschaggelar |
| Posted: Fri Nov 14, 2003 4:12 am |
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Guest
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Sam wrote:
Quote: Hi Everyone.
I am hoping to undertake a new experiment to resonate short optical
pulses (50-200 fs) in a Fabry-Perot cavity. I am interested in
purchasing a couple of mirrors that have a relatively low dispersion
coating but sufficient reflectivity to enable a Finesse of order 10^4
or 10^5. Commercial mirrors (such as those from CVI) seem to only
offer a Finesse of a few thousand. Would anyone know of an optics
company that is already providing high finesse low dispersion mirrors
or of an organisation that is willing to custom make optics that can
achieve these types of specifications?
Is there any intrinsic reason that low dispersion mirrors must exhibit
lower reflectivity or is it just that "super-mirror" polishing
technology has not been employed in low dispersion mirrors to date?
There are mirrors not introducing dispersion, the first surface mirrors.
Basically a metal vapoured onto glass. Their reflectivity is limited to
say 98%. The higher reflectivity mirrors are made with alternating
layers of dielectrica. There the light enters the material and picks up
dispersion. By carefully designing the layers of such a multilayer
dielectric mirror you can even get controlled dispersion, eg negative
dispersion. Mirror houses do that for you for a surcharge.
IMO, it might be possible to match the two mirrors such that a fabri
perot has no dispersion.
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net |
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