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Old 01-28-2013, 04:39 PM #1
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Default what is the purpose

of a dichro mounted so that it can only reflect? i bought one of meridith lens 10 pc. sets a while back. it included cylindrical lens and some dichros, along with some other lens. one of the dichros is mounted so that i could shine a beam through it and reflect off of it. but there are two mounted so that they could only be used to reflect. why would one need this when a mirror would do just as well?


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kryton groove gitd 445
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Old 01-28-2013, 05:17 PM #2
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Default Re: what is the purpose

Dichros can be used as mirrors as they have a lower power loss when reflecting than broadband FS mirrors.

I find that most broadband mirrors are 80-95% reflection and dichros are usually 95% or higher (when at the ideal wavelength)
This usually isn't a problem but when working with high power systems losing 10% of the power is a significant loss.

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Old 01-28-2013, 06:40 PM #3
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Default Re: what is the purpose

What he said. Dicroic mirrors can get damn near 100% reflectivity, and are required for low gain systems - HeNe for example.
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Old 01-28-2013, 08:39 PM #4
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Default Re: what is the purpose

If the incident beam will always fall within such a narrow bandwidth for the specified optic, its better to optimize that chunk of glass for that narrow bandwidth - getting better performing, while not having to worry about its performance elsewhere on the spectrum.

Broadband FS mirrors serve their purpose well, but only generally. Not very specifically.

In our lab, the only optics we use for bounce mirrors on a 532nm YAG are dichros made specifically for 532nm YAG with pulse peak powers averaging out in the multi-kW range.

After repeated kW peak pulses incident on the same cm^2 of area on a 85% efficient optic, the metal IE mirror layer would heat very quickly and eventually warp and distort the wavefront.
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Old 01-28-2013, 09:04 PM #5
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Default Re: what is the purpose

thanks so much for the answer. i was going thru my stuff, looking to combine beams and realized i didn't know just what they were for.
__________________
i have fond memories of owning
10 hene tubes 2 argon ion units and lots of diode and dpss lasers in these wavelengths:
405,445,450,458,473,488,532,543,594,612,632,635,650,685,780
I'm rebuilding my collection:
Skyray 405 12x
kryton groove gitd 445
B&W Tek 473 lab laser
JDSU 2214-40 multiline argon ion
Osram pl520 in an sh-032 host
Skylaser HL532-300
543 HeNe
632 HeNe x3
Opnext 638 single mode in c6 host
Rayfoss 650 150mW
Laserbee II Deluxe lpm w/ Peregrine
Laissez les bons temps rouler!
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