US 7,321,604 B2 | ||
Ultra-short wavelength x-ray system | ||
Donald Umstadter, Ann Arbor, Mich. (US); Fei He, Ann Arbor, Mich. (US); and Yue-Ying Lau, Potomac, Md. (US) | ||
Assigned to The Regents of the University of Michigan, Ann Arbor, Mich. (US) | ||
Filed on Jan. 07, 2004, as Appl. No. 10/752,604. | ||
Prior Publication US 2005/0147147 A1, Jul. 07, 2005 | ||
Int. Cl. H01S 3/00 (2006.01); H01S 3/09 (2006.01) |
U.S. Cl. 372—2 [372/73] | 29 Claims |
1. A method for generating electromagnetic radiation comprising:
producing free electrons;
selecting from said free electrons a group of electrons having an energy spread less than the remaining of said free electrons;
and
undulating the group of free electrons with an undulator in an undulation zone, said undulator having an intensity sufficient
to cause the emission of radiation from the group of electrons and causing the electron radiation to interact with radiation
from the undulator to bunch the group of electrons, whereby such bunching generates further emission of radiation, wherein
said selecting is accomplished by magnetic filtering and said magnetic filtering is accompanied by refocusing of the electron
beam to the undulation zone.
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