Laser Wiring Diagrams

Hello all :),

I'm building another Laser Since its time to get festive!

However I recently came across this wiring diagram:
https://i.stack.imgur.com/uchBl.png

I've always only used a resistor across lm317 in my circuits. and not a capacitor or the 1N4001 Series.

Would it benefit me using a capacitor and a 1N4001?

thanks