Raman has no reflection in the (dichroic) mirror

So I got tired of trying to align the little prism you can’t see in this picture (The one sitting between the microscope objective and the optical fiber assembly):

dsc02335

It’s been replaced with a 540nm long pass dichroic mirror:

dichroic-raman-1

And from above:

dichroic-raman-0

And finally with a 532nm laser pointer shone upon it:

dichroic-raman-2

It’s not perfect. The reflection is not quite 100%, and it is going to cost me on 10-20% of the intensity of the Raman scattered radiation. Hopefully the improved alignment will make up for some of this.

The system now more closely resembles a commercial Raman probe:

new-look

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