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Beam properties of fully optimized, table-top, coherent source at 30 nm

Jakubczak K., Mocek T., Rus B., Polan J., Hrebicek J., Sawicka M., Sikocinski P., Sobota J., Fort T., Pina L.

Opto-Electronics Review

2011

Vol. 19, No. 2

169-175

We present results on development and experimental implementation of a 1-kHz, coherent extreme ultraviolet (XUV) radiation source based on high-order harmonic generation of the femtosecond, near-infrared laser pulses produced by the titanium-doped sapphire laser system (35 fs, 1.2 mJ, 810 nm) at the Institute of Physics AS CR / PALS Centre. The source comprises a low-density static gas cell filled with a conversion medium, typically argon. The comprehensive optimization of the XUV harmonic source has been performed with respect to major parameters such as gas pressure in the cell, cell length, position of the focus of the driving laser field with respect to the gas cell position, size of the driving near-infrared laser beam, chirp of the femtosecond pulse, and the focal length of the lens deployed in the experimental setup. Harmonic spectra were recorded using an XUV transmission grating spectrometer developed specifically for this purpose. Detailed characterization of the XUV source has been performed including measurement of the XUV beam profile, M³ parameter of the beam, absolute energy, and spatial coherence.

Femtosecond-pulse-driven soft X-ray laser studies using a gas puff target irradiated with a Ti:sapphire laser.

Fiedorowicz H., Bartnik A., Szczurek M., Cang Hee Nam, Mocek T., Hyun Joon Shin, Yong Ho Cha, Dong Gun Lee, Kyung Han Hong Kyung Han

Optica Applicata

2000

Vol. 30, nr 1

93-102

Preliminary experimental investigations on soft X-ray lasers based on optical field ionization of gases with an ultrashort-pulse terawatt laser system are presented. Both recombination and collisional soft X-ray laser schemes have been studied. An elongated gas puff target formed by pulsed injection of a small amount of gas from a high-pressure electromagnetic valve through a nozzle in a form of a slit was used to create an X-ray laser active medium. The target was irradiated with laser pulses from a 20-fs, 50-mJ Ti:sapphire (Ti:S) laser system. Soft X-ray spectra from nitrogen, oxygen, and xenon targets are presented and discussed.