Frequency Tripling in Use

1981:

In 1981, initial papers were published on LLE’s use of frequency tripling. LLE’s third-harmonic-generation schemes for high-power glass lasers allowed for highly efficient absorption of the incident laser. By tripling the frequency of the beams, more power was delivered to the target.

R. S. Craxton, “High Efficiency Frequency Tripling Schemes for High Power Nd:Glass Lasers,” IEEE J. Quantum Electron. QE-17(9) 1771–1782 (1981).

Shown here is UV laser–matter interaction experiments that demonstrate benefits of short-wavelength irradiation