Research of frequency modulation to amplitude modulation with multi-frequency modulation

Yuliang Zhou; Sui Zhan; Yuanchao Geng; Lanqin Liu; Lixin Xu; Hai Ming

doi:10.1117/12.2036156

31 December 2013 Research of frequency modulation to amplitude modulation with multi-frequency modulation

Yuliang Zhou, Sui Zhan, Yuanchao Geng, Lanqin Liu, Lixin Xu, Hai Ming

Proceedings Volume 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 90420H (2013) https://doi.org/10.1117/12.2036156
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

For better performance of laser coupling in inertial confinement fusion (ICF), beam shaping of the focus spot is required. Among all the beam smoothing methods, the multi frequency modulation smoothing by spectral dispersion (MultiFM-SSD) proposed by LLE has the advantages of the faster smoothing and better operability. Strong frequency modulation to amplitude modulation conversion(FM-to-AM) will take place because of the complex spectrum imposed by the multi frequency modulators applied in the Multi FM-SSD method. The FM-to-AM effect is studied with numerical simulation including the polarization mode dispersion and group velocity dispersion. The results reveal that the modulation frequencies and bandwidths of multi modulators will influence the contrast degree of the FM-to-AM effect. The compensation of the FM-to-AM with arbitrary waveform generator (AWG) is also numerically simulated. The FM-to-AM effect is effectively suppressed, i.e. the non-uniformity of the pulse decreases substantially, by applying multiple intensity and phase compensation (the compensation function is obtained via G-S algorithm).

Citation Download Citation

Yuliang Zhou, Sui Zhan, Yuanchao Geng, Lanqin Liu, Lixin Xu, and Hai Ming "Research of frequency modulation to amplitude modulation with multi-frequency modulation", Proc. SPIE 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 90420H (31 December 2013); https://doi.org/10.1117/12.2036156

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available