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Wavemeter for VisibleNIRDiGangi2006.pdf
- 1. Department of Chemistry University of Illinois – Urbana/Champaign Joshua DiGangi Yun Ding Ben McCall Inexpensive Interferometric Wavemeter for Visible/NIR Lasers
- 2. Motivations Motivations Tunable laser systems require frequency calibration Tunable laser systems require frequency calibration Reference cell calibration difficult without a rough Reference cell calibration difficult without a rough measurement measurement Commercial wavemeters are often cost Commercial wavemeters are often cost- -prohibitive prohibitive Simple Simple project project for an undergraduate or a first for an undergraduate or a first- -year year graduate student graduate student
- 3. Based on the design of P.J. Fox Based on the design of P.J. Fox et.al et.al.* .* – – Cart Propulsion System Cart Propulsion System – – Computer Interface Computer Interface Works with continuous Works with continuous- -wave lasers wave lasers Yields accuracy of Yields accuracy of ± ±1 pm 1 pm Has an acquisition time of 3 Has an acquisition time of 3- -4 seconds 4 seconds Currently usable from 400 Currently usable from 400 - -1000 nm 1000 nm Requires an area of ~2.5 Requires an area of ~2.5’ ’ x 2.5 x 2.5’ ’ Our Wavemeter Our Wavemeter * P.J. Fox, R.E. Scholten, M.R. Walkiewicz, and R.E. Drullinger, “A reliable, compact and low-cost Michelson wavemeter for laser wavelength measurement”, Am. J. Phys. 67, 624 (1999).
- 4. * Motta, Leonardo. “Michelson Interferometer.” Eric Weisstein’s World of Physics. Ed. Eric Weisstein. 2006. 17 April 2006. <http://scienceworld.wolfram.com/physics/MichelsonInterferometer.html>
- 5. Visible Laser at 500 nm NIR Laser at 1000 nm N1 / N2 = λ2 / λ1
- 11. Computer Interface Computer Interface 24 24- -channels of BCD output from the HeNe counters channels of BCD output from the HeNe counters National Instruments PCI National Instruments PCI- -6503 DAQ card 6503 DAQ card LabWindows LabWindows program program – – Translates the BCD number to an integer Translates the BCD number to an integer – – Stores past readings Stores past readings – – Ignores obvious misreads Ignores obvious misreads – – Sends the most recent reading to main experiment Sends the most recent reading to main experiment computer computer
- 12. Acknowledgements Acknowledgements McCall Group McCall Group University of Illinois University of Illinois For more information: For more information: See Joshua See Joshua DiGangi’s DiGangi’s BS thesis at BS thesis at http:// http://bjm.scs.uiuc.edu/jdigangi bjm.scs.uiuc.edu/jdigangi/ /