Mr. Alexander Callahan Profile

Alexander Callahan

at Univ of Rochester

SPIE Involvement:

Author

Publications (1)

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 | 18 September 2018 Presentation

Optically-addressable liquid crystal laser beam shapers employing photoalignment layer materials and technologies (Conference Presentation)

Kenneth Marshall, Tanya Kosc, Mark Ordway, Lingyan Guo, Megan Johnston, Alexander Callahan, Hayden Carder

Proceedings Volume 10735, 107350W (2018) https://doi.org/10.1117/12.2320741

KEYWORDS: Beam shaping, Crystal optics, Laser optics, Liquid crystal lasers, Optical lithography, Liquid crystals, Laser applications, Semiconductor lasers, Electrooptic modulators, Electro optics

Read Abstract +

The ability to reversibly photo-pattern an infinite variety of high-quality, high-resolution alignment domain orientations and shapes makes photoswitchable LC devices ideal candidates for laser applications where electro-optical spatial-light modulators cannot be used due to their low laser-damage resistance (typically, 230 mJ/cm2 at 2.4 ns, 5 Hz at 1053 nm). Such all-optical devices also have the advantage of their inherent simplicity (no electrical interconnects or driver electronics) and convenient in-system write/erase capability. Azobenzene-based photoswitchable alignment materials are excellent candidates for such devices by virtue of their high laser damage thresholds at 1053 nm, which range from 24-66 J/cm2 (1.4 ns pulse). In this work, LC devices fabricated with commercial azobenzene photoalignment layers were exposed to a series of varying optical patterns that were sequentially written, erased and re-written into the assembled devices using either contact photolithography with a xenon/mercury high-pressure arc lamp source or a 433 nm diode laser. These devices were capable of being written, erased and re-written in excess of 30 times without showing significant image burn-in or loss of patterning resolution. Amplitude beam shaping of a 500 mW Nd;YLF 1053 nm laser beam in a laboratory bench-top setup was demonstrated using photoswitchable LC devices in which the beam-shaping profile had been written using the 433 nm diode laser setup and photolithography mask in a bench-top image relaying setup. Similar optical patterning experiments conducted on a series of new photoalignment materials synthesized in-house have shown one example in which written optical patterns have remained stable for more than 4 months under ambient conditions.

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