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Diana Chin1, Peter Taylor1,2, YenTing Chiu1, and Claire Gmachl1
1 Princeton University, Princeton, NJ 08544, USA
2 Permanent Address: DeSales University, Center Valley, PA 18034, USA
Background/ Motivation
 A more refined laser beam is necessary for the QC
laser to be effective in gas detection applications.
 Part I: Imaging the far-field pattern of the original
laser beam
 Part II: Coupling the light into fibers and comparing
the resulting intensity profiles
Imaging the Far-field Pattern
 MCT detector vs FLIR (Forward Looking InfraRed) Camera
Angle (degrees)
Mode Filtering with Fibers
Thank you to the Harrington group at Rutgers University for the fibers!
Based on the close resemblance of the resulting far-field
pattern to a Gaussian profile, the single mode fiber was
successful in refining the QC laser beam by filtering out the
majority of its higher order modes.
Further experiments are necessary to determine if better
alignment and coupling of the laser will yield an intensity
distribution even closer to a true Gaussian.
Holds great potential for future environmental applications,
particularly in the detection of atmospheric gases.
Thank You!