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Spatial Filtering of a Diode Laser Beam for Confocal Raman Microscopy

Journal Article · · Applied Spectroscopy
DOI:https://doi.org/10.1366/14-07671· OSTI ID:2480572
 [1];  [2];  [2]
  1. University of Utah, Salt Lake City, UT (United States); University of Utah
  2. University of Utah, Salt Lake City, UT (United States)

With the development of single-longitudinal mode diode lasers, there has been an increase in using these sources for Raman spectroscopy. This is largely due to the cost-effectiveness of diode lasers, which offer savings not only in initial capital cost, but also electrical, cooling, and replacement costs over time, when compared with ion lasers. Here, the use of diode-lasers in confocal Raman microscopy has remained a challenge, however, due to poor transverse beam quality. In this work, we present the design and implementation of a simple spatial filter capable of adapting a single-mode diode laser source to confocal Raman microscopy, yielding comparable spatial resolution as a gas-ion laser beam for profiling and optical-trapping applications. For profiling applications, spatial filtering improved x,y resolution of the beam by a factor 10, which in turn increased optical-trapping forces by ~90 times and yielded sevenfold greater Raman scattering signal intensity from an optically trapped phospholipid vesicle.

Research Organization:
University of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); NSF-IGERT Program
Grant/Contract Number:
FG03-93ER14333
OSTI ID:
2480572
Journal Information:
Applied Spectroscopy, Journal Name: Applied Spectroscopy Journal Issue: 4 Vol. 69; ISSN 0003-7028
Publisher:
Society for Applied SpectroscopyCopyright Statement
Country of Publication:
United States
Language:
English

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Optical Trapping of Unilamellar Phospholipid Vesicles:  Investigation of the Effect of Optical Forces on the Lipid Membrane Shape by Confocal-Raman Microscopy journal September 2004
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