Large-mode area (LMA) thulium-doped fibers (TDF) are one of the key components when designing 2μm laser and amplifier systems aiming to further scale deliverable output powers. Current design limitations of LMA TDF’s affecting optical-to-optical efficiency and output beam quality are well-understood. In the present work, design optimizations focused on the core and pedestal waveguides of the active fiber are proposed. Using experimental and numerical tools, the effect of splice-induced heat on the refractive index profile of the active fiber is investigated. We demonstrate that fibers designed with larger pedestal-to-core ratios suffer less index distortions during splicing allowing the end-user to achieve high coupling efficiencies and high beam qualities in a reliable fashion.
A smart Oxygen Cuvette is developed by coating the inner surface of a cuvette with oxygen sensitive thin film material.
The coating is glass like sol-gel based sensor that has an embedded ruthenium compound in the glass film. The
fluorescence of the ruthenium is quenched depending on the oxygen level. Ocean Optics phase fluorometer, NeoFox is
used to measure this rate of fluorescence quenching and computes it for the amount of oxygen present. Multimode
optical fibers are used for transportation of light from an LED source to cuvette and from cuvette to phase fluorometer.
This new oxygen sensing system yields an inexpensive solution for monitoring the dissolved oxygen in samples for
biological and medical applications. In addition to desktop fluorometers, smart oxygen cuvettes can be used with the
Ocean Optics handheld Fluorometers, NeoFox Sport. The Smart Oxygen Cuvettes provide a resolution of 4PPB units, an
accuracy of less than 5% of the reading, and 90% response in less than 10 seconds.
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.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.