I prefer to use ultrasonic instead of microwave.

In the case of microwave you have to connect the flask with condenser out of the maicrowave and using temp. regulator

Faiq H S Hussain completely agreed with the suggestion. An optimized ultrasonic assisted extraction can provide more yield and total phenolic content as compared to microwave. But still if you want to use microwave follow the link:

Article Preliminary study: Kinetics of oil extraction from sandalwoo...

Thanks for the recommendation Faiq H S Hussain and thanks Vikas Dadwal and Mariel Gullian Klanian for the references. Your help is appreciated.

In the case of microwave you have to connect the flask with condenser out of the maicrowave and using temp. regulator