If you are using Dow Corning PDMS, you can only cure it in oven due to crosslinker. However you can buy PDMS with photocrosslinker to cure with UV.
Crosslinking of PDMS without functional groups like vinyl is possible with gamma-rays or electron beams in the presence of TMP-trimethacrylate or diethylene glycole diacrylate (see file below).
It depends on what type of PDMS you are using. Generic PDMS shouldn't react on UV.
UV curing: There is UV-PDMS from Shin-Etsu which can be cured by UV.
"Due to the photo-sensitivity, the cross-linking (or curing) is initiated by UV-exposure. In contrast to generic PDMS, this allows almost full curing already at room temperature and significantly increases the curing speed (by factor of 100 and more)."
Microwave curing: I read that PDMS can be cured in a microwave oven, but I haven't tried that yet. I will try this method. I'm using only heat curing.
I noticed that when PDMS is cooled, then it get cured lot faster even at room temperature.
http://www.microresist.de/en//content/uv-curable-liquid-silicone-rubber-uv-pdms
When I cure commercial-grade PDMS, I combine the silicone and curing agent in a 9-1 (or 10-1?) ratio. I mix them vigorously, wait 15 minutes, and them inject them into a mold I have (my application might be different than yours). Then in 24-48 hours it cures.
UV curable PDMS is available here: https://www.microresist.de/en/produkt/uv-curable-liquid-silicone-rubber-uv-pdms/#:~:text=The%20UV%2DPDMS%20can%20be,coating%20for%20enhanced%20mold%20fabrication
Andrew H. Cannon, Ph.D.
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