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--- decap:laser [2023/09/04 07:46] – mcmaster
+++ decap:laser [2025/08/04 21:23] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ===== Epoxy =====
-TLDR: bulk material for standard packages can be removed using a fiber laser. However, a CO2 laser will not work (lower peak power => melts silica instead of ablating it). However the laser will damage the die surface if you try to go all the way to the surface (without using a special setup like FALIT). Finally, COB epoxy appears to be workable even with a CO2 laser
+TLDR notes:
+  * Fiber: bulk material for standard packages can be removed using a fiber laser (ex: PDIP or COB)
+    * However the laser will damage the die surface if you try to go all the way to the surface
+  * CO2 laser will work for COB but not standard packages (ex: PDIP)
+    * Lower peak power => melts silica instead of ablating it
+  * "Blue light" systems are slow (hours) but can work on all package types
+    * Commercial version: FALIT EcoBlue
+    * Here's some similar research: https://github.com/LawrenceBrode/LACED
+  * We've also had moderate success locally heating acid with laser, but its not developed enough to have specific recommendations
+Promising results: https://www.reddit.com/r/EngineeringPorn/comments/1icord2/comment/m9xy7ll/?context=3&share_id=i1YZrBEW-XINfaIcKmh4u&utm_content=1&utm_medium=ios_app&utm_name=ioscss&utm_source=share&utm_term=1
+  * What sort of laser did you use? How did you stop it from obliterating the die?
+  * Just a cheap laser off AliExpress. 3.5 watt 445nm output. Powerful enough to burn epoxy away (and the bond wires) but not powerful enough to burn silicon.
 General results
@@ Line 109: / Line 121: @@
 Seems to also work
+===== McMaster UV tests =====
+==== 2025-05-25 ====
+{{:mcmaster:decap:laser:genmitsu_laser_kiosk1.jpg?400|}}
+Tried to get Genmitsu unit to see if it would by chance work. 1) too long of wavenlength (probably. 455 nm vs want more 400 nm) 2) came defective
+-07-25
+going to try this
+https://www.amazon.com/F-Yi-Engraving-Machine-Printer-Industrial/dp/B07CRV1STJ/