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Experimental studies of soft X-ray laser for the sodium-likerecombination scheme conducted at the LF12 Laser Facility of SIOM(Shanghai Instituteof Optics and Fine Mechanics)are reported.Soft X-ray amplification was observed insodium-like copper ions by line-focused laser irradiation of slab targets.Based on thespatially-resolved measurements,the spatial distribution of the laser gain for the transition6g—4f(72.22(?))of sodium-like copper ions was obtained,and the maximums of gaincoefflcients and gain-length products at 550μm from target surface were 2.0 cm~(-1) and 3. 6,respectively.The evolution of spectrally discriminated spatial uniformity of line-shapedplasmas as lasing gain media produced by uniform laser illumination in line-focus isalso investigated.It is found that under this experimental condition the line-shapedplasma is very uniform after laser heating.
Experimental studies of soft X-ray laser for the sodium-like recombination scheme conducted at the LF12 Laser Facility of SIOM (Shanghai Institute of Optics and Fine Mechanics) are reported. X-ray amplification was observed insodium-like copper ions by line-focused laser irradiation of slab targets. Based on the spatio-resolved measurements, the spatial distribution of the laser gain for the transition 6g-4f (72.22 (?)) of sodium-like copper ions was obtained, and the maximums of gain coefflcients and gain-length products at 550 μm from target surface were 2.0 cm -1 and 3. 6, respectively. Evolution of spectrally discriminated spatial uniformity of line-shapedplasmas as lasing gain media produced by uniform laser illumination in line-focus isalso investigated. It is found that under this experimental condition the line-shapedplasma is very uniform after laser heating.