Digital locking of a three-mirror ring cavity

Author

Kallapur, Abhijit G. ; Schutte, Dirk ; Petersen, Ian R. ; Boyson, Toby K. ; Huntington, Elanor ; Sayed Hassen, S.Z. ; Hongbin Song ; Heurs, Michele

Author_Institution

Sch. of Eng. & Inf. Technol., Univ. of New South Wales, Canberra, ACT, Australia

fYear

2012

fDate

3-5 Oct. 2012

Firstpage

794

Lastpage

799

Abstract

This paper presents results for digitally locking an experimental optical cavity. Locking an optical cavity refers to the process of matching the resonant frequency of the cavity with the input laser frequency in order to facilitate maximum energy build-up inside the cavity. The cavity used in this paper is a three-mirror ring cavity with a piezo actuator mounted on one of the mirrors, which is digitally controlled to hold the cavity in lock. An integral LQG controller is designed and digitally implemented in order to achieve cavity lock and the closed-loop step response is presented. This is compared with the closed-loop step response using a digital proportional-integral controller for the three-mirror cavity.

Keywords

closed loop systems; digital control; mirrors; optical control; optical design techniques; optical resonators; step response; three-term control; LQG controller; closed-loop step response; digital locking; digital proportional-integral controller; optical cavity; piezoactuator; resonant frequency matching; three-mirror ring cavity; Adaptive optics; Cavity resonators; Frequency response; Gain; Mathematical model; Mirrors; Resonant frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

Control Applications (CCA), 2012 IEEE International Conference on

Conference_Location

Dubrovnik

ISSN

1085-1992

Print_ISBN

978-1-4673-4503-3

Electronic_ISBN

1085-1992

Type

conf

DOI

10.1109/CCA.2012.6402391

Filename

6402391