Supporting roles
Employing a liquid-based stimulated Brillouin scattering cell, the phase conjugator corrected most of the aberrations in the system, while demonstrating high reflectivity and fidelity. Mordaunt added that without phase conjugation the beam quality wouldn't be as high.
Development of the kilowatt diode also relied heavily on advances in component technology. To store enough energy to extract 10 J per pulse in a single beam line, the company needed slabs of Nd:YAG laser material that were larger than traditional slabs.
They developed a process to optically join and diffusion bond three polished Nd:YAG segments at high temperatures; the resulting slabs had material and optical properties consistent with single Nd:YAG pieces. TRW also required a 50 percent energy conversion for the second harmonic generator. For this purpose, they coupled four KTP crystals into an array.
Funded by the Defense Advanced Research Projects Agency, the advancement project is intended to benefit military applications such as long-range illumination.
In the future, the company hopes to achieve second harmonic generation with up to 500 W average power in the green.