1. Drive laser specifications:
Parameter
Nominal spec
Tolerance
Comment
Energetic:
wavelength
795 nm (10 nm bandwidth)
+/- < 15 nm
bandwidth may be reduced
pulse energy
> 25 mJ (1 nC production with 3X10-5 QE)
< 1 % rms variation
Spatial:
fluence profile
uniform (adjustable)
< 10 % (ptp)
may be Gaussian
Temporal:
rep rate
120 Hz
power profile
< 5 % (ptp)
actually require uniform uv profile
profile FWHM
10 psec
< 2 % rms
profile rise/fall times
0.5 psec
may be larger
Timing jitter
0 psec
< 0.5 psec (improve with best effort)

2. UV specifications at photocathode:
Parameter
Nominal spec
Tolerance
Comment
Energetic:
wavelength
265 nm
(3 nm bandwidth)
+/- < 5 nm
bandwidth may be reduced
pulse energy
> 0.20 mJ
(for 1 nC production with 3x10-5 QE)
< 2 % rms variation
Spatial:
fluence profile
uniform (adjustable)
< 20 % (ptp)
spot radius
1.2 mm
< 4 % (ptp)
approximate
profile centroid
0 mm
< 10 % radius (rms); (< 0.12 mm for 1.2 mm radius)

3. UV specifications at photocathode con’t…:
Parameter
Nominal spec
Tolerance
Comment
Temporal:
rep rate
120 Hz
power profile
uniform (adjustable)
<30% (ptp) for mod.> 1 THz <20% (ptp) for mod.< 1 THz
profile FWHM
10 psec
< 2 % rms
profile rise/fall times
0.5 psec (10% - 90%)
timing jitter wrt RF
0 psec
< 0.5 psec (improve with best effort