Temporal coherence of high-order harmonics generated at solid surfaces

We present interferometric measurements of the temporal coherence of high-order harmonics generated by reflection of a titanium sapphire laser off a solid surface. It is found that the coherence length of the harmonic emission is significantly reduced compared with the bandwidth limited case. To ide...

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Bibliographic Details
Published inApplied physics. B, Lasers and optics Vol. 116; no. 1; pp. 121 - 127
Main Authors Hemmers, D., Behmke, M., Karsch, S., Keyling, J., Major, Z., Stelzmann, C., Pretzler, G.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2014
Subjects
Coherence
Doppler effect
Engineering
Harmonics
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Sapphire
Solid surfaces
Temporal logic
Titanium
Path Difference
Spectral Bandwidth
Coherence Length
Pulse Train
Group Velocity Dispersion
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Summary:We present interferometric measurements of the temporal coherence of high-order harmonics generated by reflection of a titanium sapphire laser off a solid surface. It is found that the coherence length of the harmonic emission is significantly reduced compared with the bandwidth limited case. To identify the responsible mechanism, the acquired data were analyzed by means of particle-in-cell simulations, whose results show good agreement between the calculated spectra and the measured coherence times. We show that the observed broadening can be understood consistently by the occurrence of a Doppler shift induced by the moving plasma surface, which is dented by the radiation pressure of the laser pulse. In this case, this Doppler effect would also lead to positive chirp of the emitted radiation.
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ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-013-5658-0