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- Sep 20, 2013
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Much of this was collected over years of buying and trading. I have a room full of laser related parts.
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Any reason to not just use a beamsplitter and add the line filter just before the detector Ie skip the dichro in the beam path.
@ Singlemode Laser. I have a 575nm DPSS laser scheduled for delivery to me tomorrow. I am very excited about seeing what I can do to improve this laser's output. It's almost like Christmas morning and I am 5 years old again. :yh:
So I was thinking collectively we can design up a Raman unit from the eBay unit and post the full build plans. Anyone game? I think we should try it first with the 473 since the spec already has the anti stokes filter fitted and the line filter. We also benefit by already having the sma fiber connectors in place and aligned. Next change out the filter in the Raman head to 532 and use the pbs cube shown earlier. Next the microscope objective setup for Raman microscopy. By then I should have my confocal running and will be hopefully able to add Raman to that unit. Yes that’s a lot but I think it can be done and documented for others to do it. Who’s in?
I’m also thinking we use the 462nm diodes as the Raman laser and see if we can shift them up to use the existing line filter. They are 9w. Or 2w not remembering but if we heat them and only run them at 1w we still have a huge excess of photons to work with and line filters can clean up the beam or we can even use a grating to select the beamfollowed by a slit or pinhole. We can do the same for 520nm diodes but just clean the beam up with a 520 filter and hole.
The advantage. Of 473 is the stronger Raman signal and the disadVANTAGE fluorescence. But. Maybe we also set this up to do fluorescence just change filter to low pass ie longpass
Last is there a reason you must use the path for the laser and signal? What if you used two different fibers and put a collection lens on the signal fiber. Now you need no filter until the detector and no beam split loss. Is the Raman return only scattering in a narrow cone? I think it’s non coeherent and in all directions.
So I was thinking collectively we can design up a Raman unit from the eBay unit and post the full build plans. Anyone game? I think we should try it first with the 473 since the spec already has the anti stokes filter fitted and the line filter. We also benefit by already having the sma fiber connectors in place and aligned. Next change out the filter in the Raman head to 532 and use the pbs cube shown earlier. Next the microscope objective setup for Raman microscopy. By then I should have my confocal running and will be hopefully able to add Raman to that unit. Yes that’s a lot but I think it can be done and documented for others to do it. Who’s in?
I’m also thinking we use the 462nm diodes as the Raman laser and see if we can shift them up to use the existing line filter. They are 9w. Or 2w not remembering but if we heat them and only run them at 1w we still have a huge excess of photons to work with and line filters can clean up the beam or we can even use a grating to select the beamfollowed by a slit or pinhole. We can do the same for 520nm diodes but just clean the beam up with a 520 filter and hole.
The advantage. Of 473 is the stronger Raman signal and the disadVANTAGE fluorescence. But. Maybe we also set this up to do fluorescence just change filter to low pass ie longpass
Last is there a reason you must use the path for the laser and signal? What if you used two different fibers and put a collection lens on the signal fiber. Now you need no filter until the detector and no beam split loss. Is the Raman return only scattering in a narrow cone? I think it’s non coeherent and in all directions.
Last is there a reason you must use the path for the laser and signal? What if you used two different fibers and put a collection lens on the signal fiber. Now you need no filter until the detector and no beam split loss. Is the Raman return only scattering in a narrow cone? I think it’s non coeherent and in all directions.
That’s interesting but I was thinking literally two fibers side by side. One laser and the second with a collection lens on it to collect the scattered Raman light. Eliminates all the optics except the lens and a single line filter. I guess you could send the laser through the collection lens to intensify the spot on the subject but I wasn’t thinking that. The stereo microscope idea is great. You can focus on a small area and then replace the eyepiece with the laser for a measurement. I like that for safety sake rather than removing the detector. Do you see peaks from the glue and glasses in the optics path?
So I was thinking collectively we can design up a Raman unit from the eBay unit and post the full build plans. Anyone game? I think we should try it first with the 473 since the spec already has the anti stokes filter fitted and the line filter. We also benefit by already having the sma fiber connectors in place and aligned. Next change out the filter in the Raman head to 532 and use the pbs cube shown earlier. Next the microscope objective setup for Raman microscopy. By then I should have my confocal running and will be hopefully able to add Raman to that unit. Yes that’s a lot but I think it can be done and documented for others to do it. Who’s in?
I’m also thinking we use the 462nm diodes as the Raman laser and see if we can shift them up to use the existing line filter. They are 9w. Or 2w not remembering but if we heat them and only run them at 1w we still have a huge excess of photons to work with and line filters can clean up the beam or we can even use a grating to select the beamfollowed by a slit or pinhole. We can do the same for 520nm diodes but just clean the beam up with a 520 filter and hole.
The advantage. Of 473 is the stronger Raman signal and the disadVANTAGE fluorescence. But. Maybe we also set this up to do fluorescence just change filter to low pass ie longpass
Last is there a reason you must use the path for the laser and signal? What if you used two different fibers and put a collection lens on the signal fiber. Now you need no filter until the detector and no beam split loss. Is the Raman return only scattering in a narrow cone? I think it’s non coeherent and in all directions.
The existing system Raman head has a filter you need to remove that blocks some spectrum and you already know about the internal spec baffles. I was hoping to move to 780nm for Raman The detector is pretty deaf down there and I might not even need a filter since it’s unlikely to even hit a pixel ...2400 or better I’m guessing so unless a different order wraps might work.
I have an Olympus scope I want to use. I think the optics will transmit 780nm. Can only try and see what I get. I’m looking for a toxin produced by toxic algae. The laser is to be a fiber telecom laser. Eventually I want to try a confocal and see if I can focus in on cell parts specifically for id.
So my point with a scope is you can select a very small area of an object to excite Raman and determine that portion and not the broad response. Is this correct. If not I’m in a dry hole.