Free-electron-laser short pulse simulation and two-mode sideband analysis. Master's thesis

Technical Report · Sat Jun 01 00:00:00 EDT 1991

OSTI ID:5394123

Cord, G A

The Stanford Free Electron Laser (FEL), like many FELs is driven by extremely short electron pulses which drive equally short optical pulses. Simulations of the Stanford FEL describe the trapped-particle instability leading to sideband frequencies and limit-cycle behavior. Comparisons are made of recent experimental results that show close agreement between the desynchronism curves, optical spectra, and the electron spectra. The second part of this thesis analyzes sideband behavior when two modes are present in an FEL oscillator. Using two-mode wave and pendulum equations derived from Maxwell's and the Lorentz force equations, the gain and phase shift for each initial phase of the two-mode optical field can be determined numerically. Averaging over all initial phases determines the FEL optical performance. In steady-state the presence of the sideband effectively reduces the undulator's length, delaying the onset of saturation. This allows more power to be generated in the optical field then possible with only a single mode. (Author)

• Research Organization: Naval Postgraduate School, Monterey, CA (United States)
• OSTI ID: 5394123
• Report Number(s): AD-A-246044/2/XAB
• Resource Relation: Other Information: Thesis (M.S.)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FREE ELECTRON LASERS
COMPUTERIZED SIMULATION
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC PULSES
LORENTZ FORCE
MAXWELL EQUATIONS
NUMERICAL SOLUTION
OPTICAL PROPERTIES
OSCILLATORS
PENDULUMS
PHASE SHIFT
VISIBLE SPECTRA
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUATIONS
EQUIPMENT
EVALUATION
LASERS
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICAL PROPERTIES
PULSES
RADIATIONS
SIMULATION
SPECTRA
426002* - Engineering- Lasers & Masers- (1990-)