NLC Polarized Source Laser
The NLC polarized source laser is designed for use with a GaAs Polarized DC high voltage electron gun. The laser system is designed to be flexible to allow its use with various photo-cathodes, and various gun pulse structures.
| Assumed Photocathode Quantum Efficiency | 0.1% |
| Peak Polarization Wavelength for Photocathode | 780-880nm |
| Repetition rate | 120Hz |
| Bunch separation (fixed) | 1.4 to 2.8 nsec |
| Number of bunches | up to 200 |
| Bunch length (adjustable) | 200ps - 500ps |
| Bunch energy (to photocathode) | 5 uJ |
| Average laser output power (before shaping) | ~1W |
| Laser bandwidth and stability | <1nm |
| Laser intensity stability - bunch to bunch | <1% RMS* |
| Laser intensity stability - bunch train | <0.5% RMS* |
| Laser scheduled downtime | ~1% (flashlamps)** |
| Laser unscheduled downtime | <0.1%*** |
* Work is underway to determine the jitter performance of a laser of this type. These numbers are the NLC requirements
** The present design uses flashlamps. Diode pumping will be discussed in a later section
*** Based on experience with the SLC source laser system.
This laser system is a modification of the generic NLC Combined Laser System:
Power point presentation (sourcelaser.ppt)
CD1 power point presentation lasercd1.ppt
Links to: the NLC Home Page, the SLAC and KEK Institutional Home Pages.