First Harmonic and Subharmonic Emission Measurements
1975:
The first comprehensive measurements of harmonic and subharmonic emission from spherical targets were conducted.
Shown here is Fig. 3 from S. Jackel, B. Perry, and M. Lubin, “Dynamics of Laser-Produced Plasmas Through Time-Resolved Observations of the 2ω0 and 3/2ω0 Harmonic Light Emissions,” Phys. Rev. Lett. 37 (2) 95–98 (1976).