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

Adaptive beam combining and interferometry with photorefractive quantum wells

Not Accessible

Your library or personal account may give you access

Abstract

We present a comprehensive study of excitonic electroabsorption and two-wave mixing in photorefractive quantum wells. By combining these two measurements, we are able to determine the internal grating writing efficiency for converting an external spatial light modulation into an internal space-charge field. The internal writing efficiency at a fringe spacing Λ=40 µm is found to be a decreasing function of applied field, varying from ξ=0.4 at low fields to 0.2 at 12 kV/cm. The two-wave mixing efficiency in the quantum wells exceeds 40% and is used for adaptive beam combining and laser-based ultrasound detection. The quantum wells balance the hot-electron-induced photorefractive phase shift with excitonic spectral phase to guarantee quadrature in homodyne detection of ultrasound-induced surface displacements. The ability to tune through multiple quadratures is demonstrated here for the first time to our knowledge. We derive a noise-equivalent surface displacement of 1.7×10-6 Å (W/Hz)1/2 at a field of 12 kV/cm and a fringe spacing of Λ=40 µm. This value is within a factor of 7 of the shot-noise limit of an ideal interferometer.

© 2001 Optical Society of America

Full Article  |  PDF Article
More Like This
Photorefractive quantum wells: transverse Franz–Keldysh geometry

Q. Wang, R. M. Brubaker, D. D. Nolte, and M.R. Melloch
J. Opt. Soc. Am. B 9(9) 1626-1641 (1992)

Adaptive optical coherence-domain reflectometry using photorefractive quantum wells

Leilei Peng, David D. Nolte, Ping Yu, and Michael R. Melloch
J. Opt. Soc. Am. B 21(11) 1953-1963 (2004)

Photorefractive multiple quantum wells at 1064 nm

S. Iwamoto, S. Taketomi, H. Kageshima, M. Nishioka, T. Someya, Y. Arakawa, K. Fukutani, T. Shimura, and K. Kuroda
Opt. Lett. 26(1) 22-24 (2001)

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 (13)

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 (41)

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