Translator Disclaimer
19 December 2003 Coherence measurements of a transient 14.7-nm x-ray laser
Author Affiliations +
We present the longitudinal coherence measurement of the transient inversion collisional x-ray laser for the first time. The Ni-like Pd x-ray laser at 14.68 nm is generated by the LLNL COMET laser facility and is operating in the gain-saturated regime. Interference fringes are produced using a Michelson interferometer setup in which a thin multilayer-coated membrane is used as a beam splitter. The longitudinal coherence length for the picosecond duration 4d1S0 -> 4p1P1 lasing transition is determined to be ~400 µm (1/e HW) by adjusting the length of one interferometer arm and measuring the resultant variation in fringe visibility. This is four times improved coherence than previous measurements on quasi-steady state schemes largely as a result of the narrower line profile in the lower temperature plasma. The inferred gain-narrowed linewidth of ~0.29 pm is also substantially narrower than previous measurements on quasi-steady state x-ray laser schemes. This study shows that the coherence of the x-ray laser beam can be improved by changing the laser pumping conditions. The x-ray laser is operating at 4 - 5 times the transform-limited pulse.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.


Recent x-ray laser experiments on the COMET facility
Proceedings of SPIE (December 11 2001)
New techniques for the measurement of x ray beam or...
Proceedings of SPIE (December 18 2003)
X-ray laser progress for applications
Proceedings of SPIE (December 11 2001)
X-ray laser developments at PHELIX
Proceedings of SPIE (September 28 2009)

Back to Top