About the FEL
Click below to view FEL applications filmed in real-time (avi)
Free-Electron Laser Description
Output parameters: power as a function of wavelength for various sources, the lasers all being sub-picosecond.
Specifications of the JLab FEL
The Jefferson Lab FEL is a sub-picosecond, tunable light source covering the range from 250 nanometers in the ultraviolet to 14 microns in the mid-infrared, with pulse energies up to 300 microJoules, and at repetition rates up to 75 MHz. Not all parameters can be satisfied simultaneously but average powers in excess of 10 kW have been demonstrated in the infrared.
A schematic of the FEL is shown above.
Jefferson Lab FEL Output Light Parameters
| IR Branch | UV Branch | |
| Wavelength range (microns) | 1.5 - 14 | 0.25 - 1 |
| Bunch Length (FWHM psec) | 0.2 - 2 | 0.2 - 2 |
| Laser energy / pulse (microJoulesJ) | 100 - 300 | 25 |
| Laser power (kW) | > 10 | > 1 |
| Repetition Rate (cw operation, MHz) | 4.7 - 75 | 4.7 - 75 |
Jefferson Lab FEL Electron Beam Parameters
| Energy (MeV) | 80-200 | 200 |
| Charge per bunch (pC) | 135 | 135 |
| Average current (mA) | 10 | 5 |
| Peak Current (A) | 270 | 270 |
| Beam Power (kW) | 2000 | 1000 |
| Energy Spread (%) | 0.50% | 0.13% |
| Normalized emittance (mm-mrad) | <30 | <11 |
| Induced energy spread (full) | 10% | 5% |
Jefferson Lab (Broadband) THz Beamline Parameters
| Wavelength Range (THz) | 0.1 - 10 |
| Pulse Length (ps) | 0.2 - 2 |
| Energy / pulse (microJoules) | 2 |
| Repetition Rate | 1 Hz - 75 MHz |
| Total Power (watts) | 150 |