The upgrade comprises a cryogenic cooler, to improve the power dissipation and thermal stability of the final laser amplifier Ti:sapphire crystal, a high-energy pump laser for the final amplifier
, a wavefront sensor and deformable mirror system, to measure and control the wavefront phase, and an integrated 3rd-order cross-correlator, to measure the laser pulse contrast.
Partitioning the final amplifier
in this way greatly eases maintenance in the final system.
Additional filtering of undesirable harmonics could be achieved in the filter design, but the primary concern is to ensure that only the third harmonic saturates the final amplifier
The IPA is transparent to most final amplifier
parameters and is temperature compensated to minimize drift.
The output of the final amplifier
in the gain chain constitutes an amplitude-limited version of the input signal.
Therefore, built-in matching networks can determine the operating mode of the final amplifier
, limiting output power and, especially, collector efficiency.
In high power microwave transmitters and final amplifier
sections, where radiation leakage is potentially high, extremely high voltages and sometimes X-ray emissions are present.
The final amplifier
(node G) has a 15 dBm output third-order intercept.