Dr. George A. Seaver Profile

Dr. George A. Seaver

President at Sealite Engineering Inc

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 6 December 2002 Paper

Stress-Optic beam stabilization in free-space optics

George Seaver

Proceedings Volume 4873, (2002) https://doi.org/10.1117/12.455515

KEYWORDS: Modulators, Refraction, Free space optics, Collimation, Finite element methods, Beam shaping, Photography, Beam steering, Scintillation, Atmospheric optics

Read Abstract +

Reliability is the main challenge facing Free Space Optical Communications today. Fog plays a key role here, but so does range and optical power throughput. Presently, the FSOC beam has a divergence in the milliradian range in order to compensate for beam wander caused by platform drift and vibrations and atmospheric index of refraction fluctuations. This large beam divergence limits the power throughput and the maximum range for communication. A beam that is collimated to the microradian level would greatly improve the power throughput (by three to four orders of magnitude) and thus, greatly improve the range, but this would also require a fast (> 1 kHz), accurate (microradiam) beam pointing system. Stress-Optics technology can provide that system. In Stress-Optics a stress field can be imposed on almost any optical material to modulate the index of refraction within that material in a predetermined manner. In general, stress can bring about a greater change in the index than can other fields that might be imposed. Stress-Optics accomplishes uniform beam steering in two dimensions to moderate angles, as well as beam shaping, including spherical and cylindrical lensing. The method is simple, solid-state, fast (< 5 mseconds), precise (< 1 microradian), inexpensive and durable. This patented Stress-Optic technique, when operated in conjunction with CMOS imaging feedback from a reference beam, can compensate for beam wander and defocusing from both platform and atmospheric sources. The stabilization is to microradian accuracy with kHz response times and milliradian 2-D collimation control.

Proceedings Article | 11 July 2002 Paper

Stress-Optic packet switch for photonic integrated circuits

George Seaver

Proceedings Volume 4870, (2002) https://doi.org/10.1117/12.475576

KEYWORDS: Switches, Phase modulation, Glasses, Photonic integrated circuits, Optical switching, Wavefronts, Finite element methods, Refraction, Modulators, Integrated optics

Read Abstract +

In general, stress can create about the same change in the mdcx of refraction of an optical modulator as can a thermaloptic approach, but with a faster response, a smaller, simpler configuration and with less power needed to operate. Also, S-O's creates a greater change in the index than do other fields that are commonly used for modulation, such as with Electro-Optic's. The Stress—Optic technique is also durable. A 2 x 2 switch has been in operation at SeaLite Engineering since 1991; it has 1O'S cycles at 1 KHz. To implement this technology SeaLite Engineering is developing a Stress-Optic guided wave switch and technique as an add-on to a photonic integrated circuit substrate. Stress-Optic beam switching within a photomc integrated circuit can be fabricated in a nearly automated process where the S-O films are applied during the assembly of the planar waveguides. The S-O technique is fast (kHz to MHz, depending upon the circuit dimensions), low power (10's ofmicrowatts per cycle) and rugged (< lO"8cycles to date).

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years