Efficient Pumping Schemes for High Average Brightness Collisional X-ray Lasers.

Keenan, R. ; Dunn, J. ; Shlyaptsev, V. N. ; Smith, R. F. ; Patel, P. K. ; Price, D. F.

Technical Information Center Oak Ridge Tennessee

关键词: X-ray lasers;    Brightness;    Bending;    Efficiency;    Excitation;   

RP-ID  :  DE200415009726

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Advances in transient collisional x-ray lasers have been demonstrated over the last 5 years as a technique for achieving tabletop soft x-ray lasers using 2-10 J of laser pump energy. The high peak brightness of these sources operating in the high output saturation regime, in the range of 10(sup 24)-10(sup 25) ph. mm(sup -2) mrad(sup -2) s-1 (0.1% BW)(sup -1), is ideal for many applications requiring high photon fluence in a single short burst. However, the pump energy required for these x-ray lasers is still relatively high and limits the x-ray laser repetition rate to 1 shot every few minutes. Higher repetition rate collisional schemes have been reported and show some promise for high output in the future. We report a novel technique for enhancing the coupling efficiency of the laser pump into the gain medium that could lead to enhanced x-ray inversion with a factor of ten reduction in the drive energy. This has been applied to the collisional excitation scheme for Ni-like Mo at 18.9 nm and x-ray laser output has been demonstrated.