FIR optical cavity oscillation is observed with the AT&T Bell Laboratories free-electron laser

Earl D. Shaw; Robert J. Chichester; A. La Porta

doi:10.1117/12.50588

1 December 1991 FIR optical cavity oscillation is observed with the AT&T Bell Laboratories free-electron laser

Earl D. Shaw, Robert J. Chichester, A. La Porta

Proceedings Volume 1552, Short-Wavelength Radiation Sources; (1991) https://doi.org/10.1117/12.50588
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Laser emission is observed at a wavelength near 225 microns from a microtron-based free electron laser. The microtron accelerator produces macropulses with charge of 1 (mu) C at energies of 19 - 20 MeV and a 30 Hz repetition rate. The 16 microsecond(s) ec macropulse consists of 3 GHz micropulses approximately 6 mm long. The electron beam is steered and focused into a 10 m, 20 cm period, 750 helical undulator whose axis is collinear with that of a 15 m optical cavity formed by two 10 m radius of curvature copper mirrors. The far-infrared radiation is coupled through a 6 mm diameter hole located 5 mm off axis in one mirror and steered 10 m from the free electron laser and detected with a stressed Ge:Ga detector. A positive round trip laser gain is inferred from the temporal profile of the signal. The FIR temporal profile varies periodically with tuning of the rf micropulse frequency with a period of 25 kHz. This evidence of micropulse radiation interference and evidence of threshold behavior indicate optical cavity oscillation in the FIR. The intra-cavity power is estimated to be about 100 Watts. Characterization of the AT&T Bell Laboratories free electron laser is in progress and present status is reported.

Citation Download Citation

Earl D. Shaw, Robert J. Chichester, and A. La Porta "FIR optical cavity oscillation is observed with the AT&T Bell Laboratories free-electron laser", Proc. SPIE 1552, Short-Wavelength Radiation Sources, (1 December 1991); https://doi.org/10.1117/12.50588

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