Collection Of theses on high power laser and plasma physics, 2012, 10 (1): 060501, Published Online: Jun. 2, 2017
Analysis on FM-to-AM conversion induced by spatial filter in a high-power laser system
Abstract
In order to avoid stimulated Brillouin scattering and smooth the final focal spot that reaches the D-T capsule, spectral broadening is essential. However, the modulation of spectral structure might result in frequency-to-amplitude modulation (FM-to-AM) conversion. The spatial filter pinhole is used to cut off the high-frequency transmission laser, and to ensure the desired pass. Improper parameter of pinhole would lead a negative impact. Using the spatial filter pinhole, we analyze the characteristic of intensity modulation using several pinholes of improper parameters. We then compare these results with the intensity modulation obtained from an experiment. Experimental diagnosis and design of an appropriate pinhole parameter would be highly beneficial to the field of high-power lasers.
Hujie Zhang, Shenlei Zhou, Youen Jiang, Jinghui Li, Wei Feng, Zunqi Lin. Analysis on FM-to-AM conversion induced by spatial filter in a high-power laser system[J]. Collection Of theses on high power laser and plasma physics, 2012, 10(1): 060501.