User`s manual

23
6. Watch amplification with pin-diode and oscilloscope, slightly
moving pump beam with external mirror.
7. Get maximum amplification slightly adjusting AM1, L1, Y3,
and M5.
8. Pulse amplification is determined by amplification saturation
level. An amplification saturation is highest when only 3-4
amplified pulses are detected with oscilloscope.
9. Check energy of amplified pulses at 8-pass amplifier
configuration, E
pump
= 20 mJ, and 750 pump beam diameter
inside the TIS. Average power of a train containing 3-4 pulses
should be not less than 70 – 80 mW after pulse compressor
when 50 Hz pump laser is used.
10. Remove half wave plate.
11. Switch on the electronics unit.
12. With controls of the synchronization unit change a delay of
the selected femtosecond pulse and achieve maximum
amplification for the selected pulse. Average power of amplified
pulses should be 50 – 55 mW when 50 Hz pump laser is used,
and spontaneous emission should not be more than 8 – 10 mW
at closed input for seed femtosecond pulses.