50/50 Beamsplitter?

March 26, 2007 at 8:06 am | | everyday science, hardware, help me

I guess optics are harder to make in the infrared. You ask for a 50/50 beamsplitter for 3.5 to 6.5 microns and you get something like this. I guess it crosses 50% T a couple of times within the spectral window so I shouldn’t complain.

If anyone knows a good source for IR beamsplitters that have flat spectral responses and also don’t achieve their %Reflectance with multiple little reflections leading to strings of pulses separated in time by a few tens of femtoseconds let me know.


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  1. That’s your punishment for not using narrowband light.

    Comment by kendall — March 26, 2007 #

  2. ew

    Comment by sam — March 26, 2007 #

  3. I don’t know your application but why don’t you use a half wave plate and a polarization beam splitter cube instead? then you will have the freedom of continuously adjusting their relative intensities. CVI makes affordable PBSC and thorlabs has decent waveplates. if you are concerned about the polarization, you can always change it afterwards.

    Comment by nick — March 31, 2007 #

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