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):


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


And from above:


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


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:



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