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.
Comparing of calculated and experimental results of CAPEX-U device
The CAPEX-U (CAPillary EXperiment-Upgrade) apparatus has been developed as an XUV source based on high-current capillary discharge. Our main motivation for building such new device was to create the XUV source with amplification of spontaneous emission at shorter wavelengths (below 20 nm), which have more practical applications (the soft X-ray source for lithography and microscopy). The final experimental setup of the new device is described and the preliminary experimental results of the assembled apparatus are presented, especially the capillary current signal, and the time development of the pulse-forming-line voltage. The comparison of these experimental results with calculated/predicted values is reported in this paper as well.
Study of low current capillary discharge for compact Soft X‐ray laser
Capillary discharge experiments were carried out to get a lasing of Ne‐like Ar. The relation between the appearance of the laser output and the instabilities of longitudinal modes has been studied by side‐view observation. And observation of lasing at a low discharge current of 9 kA provides us a possibility of designing a compact and high‐repetition‐rate soft X‐ray laser by use of a semiconductor switch instead of a gap switch.