@Ka**
you need
-original marriage certificate (the one with the rose border)
copies of:
-data page of your passport
-visa & entry stamp to Lao
-ft/bk of the original marriage certificate
-ft/bk of thai wife's i/d card
-thai wife's house book listing
2 - passport sized photos (3 really because you need 1 to get into Lao)
you sign everything with your name on it, she signs everything with her name on it meaning you BOTH sign the marriage certificate
Your wife doesn't need to go.