Optical analysis of grazing incidence ring resonators for free- electron lasers. Final report, June 6, 1988--November 1, 1989
- Alabama Univ., Birmingham, AL (United States). Dept. of Physics
The design of resonators for free-electron lasers (FELS) which are to operate in the soft x-ray/vacuum ultraviolet (XUV) region of the spectrum is complicated by the fact that, in this wavelength regime, normal incidence mirrors, which would otherwise be used for the construction of the resonators, generally have insufficient reflectivities for this purpose. However, the use of grazing incidence mirrors in XUV resonators offer the possibility of providing sufficient reflectivity a lessening of the mirrors` thermal loads due to the projection of the laser beam onto an oblique surface, and the preservation of the FEL`s tunability. In this work, the behavior of resonators employing grazing incidence mirrors in ring configurations is explored. In particular, two designs, each utilizing four off-axis conic mirrors and a number of flats, are examined. In order to specify the. location, orientation, and surface parameters for the mirrors in these resonators, a design algorithm has been developed based upon the properties of Gaussian beam propagation. Two computer simulation methods are used to perform a vacuum stability analysis of the two resonator designs. The first method uses paraxial ray trace techniques with the resonators` thin lens analogues while the second uses the diffraction-based computer simulation code GLAD. The effects of minor tilts and deviations in the mirror surface parameters are investigated for a number of resonators designed to propagate laser beams of various Rayleigh ranges. It will be shown that resonator stability de s as the laser wavelength the resonator was designed for is made smaller. In addition, resonator stability will also be seen to decrease as the amount of magnification the laser beam receives as it travels around the resonator is increased.
- Research Organization:
- Los Alamos National Lab., NM (United States); Alabama Univ., Birmingham, AL (United States). Dept. of Physics
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10124440
- Report Number(s):
- LA-SUB-93-7; ON: DE93006339
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); PBD: 1989
- Country of Publication:
- United States
- Language:
- English
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43 PARTICLE ACCELERATORS
FREE ELECTRON LASERS
CAVITY RESONATORS
OPTICS
COMPUTER-AIDED DESIGN
PROGRESS REPORT
ACCELERATORS
WIGGLER MAGNETS
MIRRORS
ALGORITHMS
LENSES
G CODES
COMPUTERIZED SIMULATION
X RADIATION
EXTREME ULTRAVIOLET RADIATION
426002
430303
LASERS AND MASERS
EXPERIMENTAL FACILITIES AND EQUIPMENT