Compact Diode Laser for Near Infrared Methane Spectroscopy
Explore the development of a compact diode laser for near infrared methane spectroscopy, including motivation, challenges, methane absorption spectroscopy, and assembling the laser components. Learn about the interior of the diode laser and the powering mechanisms involved in this innovative technology.
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Presentation Transcript
Compact Diode Laser for Near Infrared Methane Spectroscopy Ottillia Ni Mentor: Dr. Kristan Corwin August 5, 2016
Motivation Expand gas-filled hollow fiber references to 1.6 microns wavelengths. o Absorption spectroscopy and sub-Doppler spectroscopy in methane-filled hollow fibers
Challenges of the Diode Laser Using the Littrow configuration to calculate the diffraction angle off the diffraction grating. Reconstructing and machining of an adapted diode laser design at the new grating angle. Redesigning the mirror mount to avoid beam clipping, passing a beam radius 4x the full width half maximum (FWHM). Needing high power to saturate methane for sub-Doppler spectroscopy
Methane (CH4) 4.0 3= 3158.6 cm-1, 2 3= 6317.2 cm-1 https://www.researchgate.net/figure/278652214_fig4_Figure-18-18-Methane-vibrational-normal-modes http://www.nist.gov/pml/electromagnetics/grp05/other-activities.cfm
Assembling a Compact Diode Laser
Interior of the Diode Laser 1 2 3 4 29.50 A Littrow Configuration .13 B .51 Mirror Diffraction Grating (600 lines/mm) 59.00 .03 1.91 C Laser Beam .50 .24 D d= line spacing = incidence angle = diffraction angle B= blazed angle E DEBUR AND BREAK SHARP EDGES UNLESS OTHERWISE SPECIFIED: DIMENSIONS ARE IN MILLIMETERS SURFACE FINISH: TOLERANCES: LINEAR: ANGULAR: FINISH: DO NOT SCALE DRAWING REVISION DATE SIGNATURE NAME TITLE: DRAWN CHK'D APPV'D F MFG mirrormountlaser MATERIAL: Q.A DWG NO. A4 WEIGHT: SCALE:1:1 SHEET 1 OF 1 https://en.wikipedia.org/wiki/Blazed_grating
Laser Parts Thermoelectric coolers (TECs) - heat pumps used to cool systems. PZT fine tune position of the the laser Thermistor- electrical resistor used for measurement and heat control Temperature Chip determines the temperature of laser http://www.ebay.com/itm/400W-12V-Thermoelectric-Cooler-Peltier-Plate-TEC-NEW-/111201613218
Powering the diode laser Cable: 6ft long
Future Works Align and fiber-couple the laser, fill a hollow core fiber with methane, and tune the laser to the resonance of the methane line Conduct absorption spectroscopy and sub-Doppler spectroscopy at 1.6 microns Develop sealed hollow-core fibers filled with methane absorbing laser light as a frequency reference. 20 m https://www.thorlabs.com/thorproduct.cfm?partnumber=HC19-1550
Acknowledgements Special thanks to: Dr. Kristan Corwin Dr. Brett DePaola Dr. Brian Washburn Ryan Luder Sajed Hosseini-Zavareh, Neda Dadashzadeh, Kushaan Weerasinghe, Manasa Thirugnanasambandam Fellow Physics REU Peers Dr. Brett Flanders Kim Coy This work is partially funded by the National Science Foundation (NSF) and the Air Force Office of Scientific Research (AFOSR) through NSF grant number PHYS-1461251.
