Experimental test of hole-coupled FEL resonator designs using a CW-HeNe laser
We report on ongoing experiments and simulations which model the performance of hole-coupled resonators. We have previously studied a hole-coupled resonator which was well inside the stable region (stability parameter g = {minus}0.8). In the far field, good agreement between experiment and simulation was obtained for both the intracavity and outcoupled mode-profile. The present study involves a resonator with a stability parameter of {minus}0.987, identical to the stability parameter of the proposed Infrared Free Electron Laser (IRFEL) at Lawrence Berkeley Laboratory. The experiments were carried out with a frequency stabilized CW-HeNe laser beam at a wavelength of 632.8 nm. Both intracavity and outcoupled mode profiles and power levels were measured. The simulations were done using the code HOLD, which is based on the Fresnel approximation for the Huygens kernel. Within the experimental uncertainties, magnified due to the 1/(1+g) dependence of the mode characteristics on errors in measured resonator parameters, we have obtained fair agreement between experiment and simulation.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10143261
- Report Number(s):
- LBL-33603; ESG-246; CONF-930159-20; ON: DE93010439
- Resource Relation:
- Conference: OE/LASE `93: International Society for Optical Engineering (SPIE) conference,Los Angeles, CA (United States),13-23 Jan 1993; Other Information: PBD: Jan 1993
- Country of Publication:
- United States
- Language:
- English
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Experiment and simulation of hole-coupled resonator modes with a CW HeNe laser
Experiment and simulation of hole-coupled resonator modes with a CW HeNe laser