70 likes | 327 Views
Mode Filtering of a λ ≈ 14 μm Quantum Cascade Laser via Single and Multi-mode Fibers. Diana Chin 1 , Peter Taylor 1,2 , YenTing Chiu 1 , and Claire Gmachl 1 1 Princeton University, Princeton, NJ 08544, USA 2 Permanent Address: DeSales University, Center Valley, PA 18034, USA.
E N D
Mode Filtering of a λ ≈ 14 μm Quantum Cascade Laser via Single and Multi-mode Fibers 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 Intensity Angle (degrees)
Mode Filtering with Fibers Thank you to the Harrington group at Rutgers University for the fibers!
Conclusion • 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.