Abstract

We present a new application of the stochastic parallel gradient descent (SPGD) algorithm to fast active phase control in a Fourier synthesis system. Pulses (4.9 ns) with an 80 MHz repetition rate are generated by feedback from a single phase-sensitive metric. Phase control is applied via fast current modulation of a tapered amplifier using an SPGD algorithm realized on a field-programmable gate array (FPGA). The waveforms are maintained by constant active feedback from the FPGA. We also discuss the extension of this technique to many more semiconductor laser emitters in a diode laser array.

© 2015 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Coherent beam combination of four holmium amplifiers with phase control via a direct digital synthesizer chip

Michael R. Oermann, Neil Carmody, Alexander Hemming, Simon Rees, Nikita Simakov, Robert Swain, Keiron Boyd, Alan Davidson, Leonardo Corena, Dmitrii Stepanov, and John Haub
Opt. Express 26(6) 6715-6723 (2018)

Microscale adaptive optics: wave-front control with a µ-mirror array and a VLSI stochastic gradient descent controller

Thomas Weyrauch, Mikhail A. Vorontsov, Thomas G. Bifano, Jay A. Hammer, Marc Cohen, and Gert Cauwenberghs
Appl. Opt. 40(24) 4243-4253 (2001)

Multi-perturbation stochastic parallel gradient descent method for wavefront correction

Kenan Wu, Yang Sun, Ying Huai, Shuqin Jia, Xi Chen, and Yuqi Jin
Opt. Express 23(3) 2933-2944 (2015)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription