Gas-filled-capillary discharge experiment
We have studied high-current capillary discharge as a prospective XUV laser source since 1998. We have built two experimental devices CAPEX and CAPEX-U. On both these devices we have observed the very strong amplification of neon-like argon line at 46.9 nm, which corresponds to laser transition. Recently high resolved spectra were obtained with the help of McPherson spectrometer as well as a spherical Si/Sc multilayer mirror was used to focus laser pulses generated by a 46.9-nm capillary-discharge amplifier. The latest experimental results are presented in this paper.
Strong Amplification of Ne-like AR line in the Source Based on Capillary Discharge
For the first time we have used a surveillance homemade flat field XUV spectrograph for the measurement of soft X-ray emission from the capillary discharge device CAPEX when using of an external capillary pre-pulse driver. The time-resolved XUV spectrum is presented. It was found that a very short intense spike that had been measured by a vacuum photodiode likely corresponds to a laser pulse. Modifications/assemblies of the spark gap switch the capillary, and the fast electromagnetic shutter are described as well.
Factor affecting the pulse width of capillary discharge soft x-ray laser
Capillary discharge experiments were carried out to get a lasing of Ne-like Ar line (J=0-1, /spl lambda/=46.9 nm) with two devices. At optimum condition with one device, gain-length product gl of 8.4 (g=0.7 cm/sup -1/), laser energy of 300 nJ and FWHM of 2.5 ns were obtained. With the other device, laser energy of 135 nJ and FWHM of 0.6 ns were obtained. Comparison with two devices, the pulse widths of laser may depend on theirs dl/dt.