Second Harmonic FEL Oscillation

Conference · Sat Sep 01 00:00:00 EDT 2001

OSTI ID:786149

Neil, George R; Benson, S V; Biallas, G; Freund, H P; Gubeli, J; Jordan, K; Myers, S; Shinn, Michelle D

We have produced and measured for the first time second harmonic oscillation in the infrared region by the high average power Jefferson Lab Infrared Free Electron Laser. Although such lasing is ideally forbidden, since gain is zero on axis for a perfect electron beam in an infinite wiggler, the finite geometry and beam emittance allows sufficient gain for lasing to occur. We were able to lase at pulse rates up to 74.85 MHz and could produce over 4.5 watts average and 40 kW peak of IR power in a 40 nm FWHM bandwidth at 2925 nm. In agreement with predictions, the source preferentially lased in a TEM01 mode. We present results of initial source performance measurements and comparisons of gain as calculated by different approaches.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 786149
• Report Number(s): JLAB-ACC-01-16; DOE/ER/40150-1903; TRN: US0201157
• Resource Relation: Conference: FEL 2001, Darmstadt (DE), 08/20/2001--08/24/2001; Other Information: PBD in Nuclear Instruments and Methods in Physics Research A, Vol. 483 (1-2) (2002) pp. 119-124; PBD: 1 Sep 2001
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM EMITTANCE
ELECTRON BEAMS
FREE ELECTRON LASERS
GEOMETRY
HARMONICS
OSCILLATIONS
PERFORMANCE