Appropriate DPSS laser for DIY Raman?

[mysticarc]

I'm trying to build a DIY Raman spect connected to a compound light microscope (detailed in laserpointerforums.com/threads/raman-spectroscopy.102872/post-1534155) and I came across this laser:

ebay.com/itm/155196685156

Digging in deeper, it seems like this is the laser (spec sheet): photonik.com.sg/products/Laser_Modules_and_Systems/Solid-State_Lasers/DPSSL_532nm(10-800mW).pdf

I know that the linewidth needs to be super narrow for Raman, but some input would be appreciated.

There is also this one, but 532 nm is better suited for graphene than 473 nm: ebay.com/itm/143972363687?itmmeta=01J636QQYBXRXYAE87K6469H46

 

[kecked]

Actually something in the 785nm range is best. Gets you away from fluorescence. What is most important is the edge filter. Also be aware fibers going into a spec can also react and give false signals. I tried this and thought how hard can it be. Well it is harder than you think. You need couple hundred mw and a good filter choice is a laser that is stable. A hene looks good but isn’t unless you add a line filter. Tons of stay light inside those. Temp control the laser. I find diodes are better than dpss. Following good luck

 

[mysticarc]

For my research, pretty much everyone uses a 520 nm green laser but I'm a bit confused at two things.

1. You mentioned you need several hundred mW, but the laser power recommended by Raman is typically 10 to 35 mW.
2. Also, a diode laser doesn't have that narrow linewidth that you need for Raman versus a good DPSS laser.

An edge filter is a good suggestion.

 

[kecked]

You put a line filter on the diode. That’s the power on the sample through the lens. 785 is the usual wavelength goth as it avoids fluorescence. I have seen 532 for graphite sheet vs 3d. The edge and line filters are critical depending on how close in you need to get. For 2d 3d graphite it’s not as important.

 

[atomd]

You can ECDL your laser diode to get it into extremely narrow-band region