Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Beam drift reduction by straightness measurement based on a digital optical phase conjugation

Not Accessible

Your library or personal account may give you access

Abstract

One of the greatest challenges of long distance measurement is the beam drift caused by the air refractive index gradient. It has been established in many researches that optical phase conjugation (OPC) can be used to compensate for the beam bending. However, this method is limited to responding speed, phase conjugate reflectivity, flexibility, and specific source and medium. To reduce beam drift, instead of OPC, this study applies a digital OPC (DOPC) method, which is also creatively applied to collimation and flatness measurements. The main devices in the wavefront correction unit are the spatial light modulator and the Shack–Hartmann wavefront sensor. For the straightness measurement unit, the collimation and flatness of the optical rail are measured through the prism system and a position-sensing detector. After wavefront compensation, the root mean square is decreased from 0.0029λ to 0.0005λ. The beam drift is decreased from 1.22 mm to 0.70 mm in the x direction and from 2.49 mm to 1.55 mm in the y direction. The experimental data indicate that the straightness measurement system based on DOPC can effectively decrease the beam drift.

© 2019 Optical Society of America

Full Article  |  PDF Article
More Like This
Method for auto-alignment of digital optical phase conjugation systems based on digital propagation

Mooseok Jang, Haowen Ruan, Haojiang Zhou, Benjamin Judkewitz, and Changhuei Yang
Opt. Express 22(12) 14054-14071 (2014)

Calibration of digital optical phase conjugation setups based on orthonormal rectangular polynomials

Mehdi Azimipour, Farid Atry, and Ramin Pashaie
Appl. Opt. 55(11) 2873-2880 (2016)

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 Optica member, or as an authorized user of your institution.

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

Figures (7)

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

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

Equations (7)

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

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

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved