1, The full form of SASE is Self-Addressed Stamped Envelope. It’s used on Business ,Business Terms in Worldwide

A Self-Addressed Stamped Envelope (SASE) is an envelope with the sender’s name and address on it, with affixed paid postage and mailed to a company or private individual, so that the recipient can send you something in return at your expense. The SASE will be contained in another outer envelope that is addressed to the business or company and also contains appropriate postage. The SASE saves the responders money and time that would have been spent for postage and addressing the envelope.

2, The full form of SASE is Self Amplified Spontaneous Emission. It’s used on Academic & Science ,Physics in Worldwide

Self Amplified Spontaneous Emission (SASE) is a process within a free-electron laser by which a laser beam is created by the high-energy electron beam. The term “self” in the ‘Self Amplified Spontaneous Emission’ only emphasizes that the amplification occurs in the same device which produced the spontaneous emission.