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Extreme Ultraviolet Radiation Spectrometer Design and Optimization

Extreme Ultraviolet Radiation Spectrometer Design and Optimization. Shaun Pacheco Mentors: Dr. Guillaume Laurent & Wei Cao. Research Project. Goal 1: Improve the Resolution Goal 2: Calibrate the Spectrometer to find wavelengths not intensity profile. Diagram of Apparatus. RM. TM.

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Extreme Ultraviolet Radiation Spectrometer Design and Optimization

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  1. Extreme Ultraviolet Radiation Spectrometer Design and Optimization Shaun Pacheco Mentors: Dr. Guillaume Laurent & Wei Cao

  2. Research Project • Goal 1: Improve the Resolution • Goal 2: Calibrate the Spectrometer • to find wavelengths • not intensity profile

  3. Diagram of Apparatus RM TM 0.5m FM High-Order Harmonic AF GC Gas Jet M4 M2 MCP DM COLTRIMS PSD MCP M3 BS Spectrometer PSD DS 40fs@800nm To XUV Spectrometer Magnetic Coils M1 Interferometer M1~M4: Plane mirror BS: Beam splitter RM: Recombination mirror MCP: Microchannel Plate FM: Focusing mirror GS: Gas cell DS: Delay stage PSD: Positon Sensitive Detector DM: Diverging mirrorAF: Al filter TM: Toroidal Mirror

  4. Diagram of Apparatus Diffraction Grating Diffraction Grating Spherical Mirror Spherical Mirror Minus first and second order diffraction shown in the image Phosphor Plate MCP

  5. High Harmonic Generation Where n is an odd integer, ω0 is the fundamental laser frequency, "High-order Harmonic Generation." Swineburne4 Aug. 2010. <www.swinburne.edu.au/engineering/caous/HHG.htm >.

  6. Energies Allowed in Experiment Transmission Argon Highest Order cut-off determined by E = 3.2Up + Ip Ip is the ionization potential of the gas Up is the mean kinetic energy of the electron Highest energy seen is 51eV Aluminum Foil Photon Energy (eV) Aluminum Foil 200 nm thickness Argon - 200 mTorr for 3 cm followed by 5 mTorr for 1 m Tong. High-Order Harmonic Generation. <http://www.phys.ksu.edu/personal/xmtong/class/chapter02.pdf> Gullikson, Eric. "X-Ray Interactions With Matter." Lawrence Berkeley National Laboratory. N.p., n.d. Web. 4 Aug. 2010. <henke.lbl.gov/optical_constants/>

  7. Goal 1: Improving the Resolution Phosphor Plate New Placement Old placement "Microchannel Plate Principles of Operation." HRC. Web. 4 Aug. 2010. <hea-www.harvard.edu/HRC/mcp/mcp.html >.

  8. Goal 1: Improving the Resolution Microchannel Plate 4 mm Phosphor plate Old Gap 10 mm Phosphor plate was moved from 10 mm away to 4 mm

  9. Goal 1: Resolution improved New Resolution Old Resolution

  10. Goal 2: Calibrating the Spectrum Find distance of each spectral line from zero order Integrate across the spectral lines to get intensities d is the slit spacing m is the diffraction order θi is the incident angle θd is the diffracted angle

  11. Calibrated Spectrum Black Curve is the photoelectron spectrum Blue Curve is the spectrum from the XUV spectrometer Energy resolution is comparable to photoelectron spectrum Count (arb. Units) Photoelectron Energy (eV)

  12. Results and Discussion Blue Shift Can be Observed Blue Curve – Low Intensity, no blue shift Red Curve – Medium Intensity, blue shift Yellow Curve – High Intensity, blue shift Harmonics

  13. Conclusion • XUV spectrum is now comparable to photoelectron spectrum • Spectrometer good enough to observe small change in the harmonic wavelength • Improvements: • Calibrate the intensity profile of XUV spectrum

  14. Work Cited • "High-order Harmonic Generation." Swineburne4 Aug. 2010. <www.swinburne.edu.au/engineering/caous/HHG.htm > • "Microchannel Plate Principles of Operation." HRC. 4 Aug. 2010. <hea-www.harvard.edu/HRC/mcp/mcp.html >. • Gullikson, Eric. "X-Ray Interactions With Matter." Lawrence Berkeley National Laboratory. Web. 4 Aug. 2010. <henke.lbl.gov/optical_constants> • Tong. High-Order Harmonic Generation. <http://www.phys.ksu.edu/personal/xmtong/class/chapter02.pdf>

  15. Questions?

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