Abstract
Free electron lasers have passed through three stages in their development: the initial exploratory phase in which different kinds of free electron laser and their accelerators were built and operated, their technical problems addressed, and a preliminary understanding of the physics issues established. In the second phase, recently completed careful experiments were performed with better characterized machines in which most of the important physics issues governing their performance were examined in detail. In the third phase, just being entered, machines of various sizes are being built, mostly to satisfy the needs of user groups that want to take advantage of the special properties of the light generated by these machines for various military, industrial, medical, or scientific purposes.
© 1989 Optical Society of America
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