industrial affiliates workshop, feb. 2007 femtosecond enhancement cavities for generation of light...
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Industrial Affiliates Workshop, Feb. 2007
Femtosecond enhancement cavities for generation of light at extreme wavelengths
R. Jason Jones
College of Optical SciencesUniversity of Arizona
Email: [email protected]
Graduate Student:James Johnson
Funding:National Science Foundation
Research Interests…
• Ultrafast Optical Science
• Optical Frequency Metrology
Research Interests…
• Ultrafast Optical Science
• Optical Frequency Metrology
Generation of coherent light at “extreme” wavelengths
Precision spectroscopy in the vacuum ultraviolet
next generation atomic clocks tests of fundamental physics
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Research Interests…
• Ultrafast Optical Science10-100 fs
State of the art until ~5 years ago
Research Interests…
• Ultrafast Optical Science<1 fs
State of the art today…carrier phase control
attosecond timing dynamics access to high electric field strengths coherent addition and synthesis
Research Interests…
• Ultrafast Optical Science<1 fs
State of the art today…carrier phase control
attosecond timing dynamics access to high electric field strengths coherent addition and synthesis
laser
Research Interests…
• Ultrafast Optical Science<1 fs
laser
State of the art today…carrier phase control
attosecond timing dynamics access to high electric field strengths coherent addition and synthesis
Femtosecond enhancement cavities
laser
Femtosecond enhancement cavities
laser
Xenon Plasma
Femtosecond enhancement cavities
laser
0.8
0.6
0.4
0.2
0.0765.5765.0
1.2
0.8
0.4
0.0820.0819.0818.0
1.6
1.2
0.8
0.4
0.0
Abso
rptio
n (a.
u.)
850840830820810800790780770760Wavelength (nm)
H2O O2
NH3
spectroscopy
Xenon Plasma
Femtosecond enhancement cavities
laser
0.8
0.6
0.4
0.2
0.0765.5765.0
1.2
0.8
0.4
0.0820.0819.0818.0
1.6
1.2
0.8
0.4
0.0
Abso
rptio
n (a.
u.)
850840830820810800790780770760Wavelength (nm)
H2O O2
NH3
spectroscopyExtreme
Nonlinear optics
Xenon Plasma
•Nonlinear frequency upconversion in a dilute gas
• Harmonics generated into “soft” x-ray regime Microscopy and biological imaging (> 250 eV)
EUV holographyNanolithographyAttosecond pulse generation
…•Traditional method: Single pass with amplified pulse
VUV light source
VUV light source
Femtosecond enhancement cavity - Ideally suited for HHG
–Low intra-cavity losses (low conversion efficiency)–Power is “recycled”–Maintains high repetition rate
VUV light source
Femtosecond enhancement cavity - Ideally suited for HHG
–Low intra-cavity losses (low conversion efficiency)–Power is “recycled”–Maintains high repetition rate
3rd harmonic (266 nm)
5th harmonic (160 nm)
7th harmonic(114 nm)
Gas jet
Focusing mirror
drilled mirror Coherent EUV light
Higher-order cavity mode
VUV light sourceVUV light source
- TEM0,1 mode- ~ 275 micron hole
Numerical calculations
fs enhancement cavities with higher-order spatial modesfs enhancement cavities with higher-order spatial modes
Hole diameter (microns)
10-1
10-2
10-3
10-4
Los
s
Cavity loss L~ 0.16%
2-color femtosecond enhancement cavities
fs laser 2
fs laser 1
FEC chamber
• Coherent pulse synthesis
• Efficient HHG
•Terahertz Generation
Summary
• Femtosecond enhancement cavities
High-field nonlinear optics Generation of coherent light at extreme wavelengths
• Precision spectroscopy in the vacuum-ultraviolet
Next generation optical clocksPrecision tests of fundamental physics
•Precision tests of fundamental physics• Hydrogen: 1S-2S, 243 nm (Hänsch et. al.)• Helium: 11S- 2 1P, 58.4 nm (Hogervorst, Ubachs et.al.)
11S- 2 1S, 120 nm ( Eyler et. al.)
•High-resolution spectroscopy of multi-electron atoms(compare with quantum-defect theory)
• Xenon: 105 nm (Ubachs et. al., 2001) • Krypton: 88 nm (Bellini et al, 2002)
212 nm (Eikema et. al., 2005)
•Applications•Extreme-UV atomic clocks
• Efficient production of metastable statese.g. atomic lithography
0Q
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Precision spectroscopy in the vacuum-ultravioletPrecision spectroscopy in the vacuum-ultraviolet