An investigation of x-ray pumped x-ray laser systems, parameters, and performance
The authors describe the physics and the design of x-ray lasers pumped either by synchrotron radiation generated in a high energy storage ring, or by other x-ray beams. The 1s2p[sup 3] [sup 3]S[sub 1] [yields] 1s[sup 2]2p[sup 2] [sup 3]P[sub 0,1,2]; 1s2p[sup 2] [sup 2]P[sub 1/2,3/2] [yields] 1s[sup 2]2p [sup 2]P[sub 1/2,3/2]; 1snp [sup 1]P[sub 1] [yields] 1s[sup 2] [sup 1]S[sub 0]; and the np [sup 2]P[sub 1/2,3/2] [yields] 1s [sup 2]S[sup 1/2] transitions in four, three, two and one electron ions, respectively, were selected as possible candidate lasing transitions in medium composed of a light element with 3 [le] Z [le] 10. Several inversion schemes are discussed. The authors consider in detail a special class, referred to as the [open quotes]bridge scheme[close quotes]. It could be used to produce lasing on all four types of transitions mentioned. A general purpose analytical model is constructed to simulate the inversion dynamics in this class of lasers. It is applied to the case when the lasing medium is boron. In collisionless media the model's predictions are found to agree well with a more detailed numerical calculation. The performance of a laser based on the B[sup 3+] as2p [sup 1]P[sub 1] [yields] 1s[sup 2] [sup 1]S[sub o] transition utilizing the bridge scheme in boron vapor, is examined theoretically. Both the analytical model and a detailed numerical model are used to carry out the calculations. For high pumping fluxes the population inversion time is found to be about equal to the pumping time (about 5x10[sup [minus]12] sec). For a Gaussian pumping x-ray pulse with a peak flux near 1.4 x 10[sup 31] cm[sup [minus]2]s[sup [minus]1], lasting 4 x 10[sup [minus]13] sec, a small signal gain in excess of 1300 cm[sup [minus]1] is obtained. The possible advantages of using a polarized laser beam are investigated. Lasing on the B[sup 4+] 2p [sup 2]P[sub 1/2,3/2] [yields] 1s [sup 2]S[sub 1/2] transitions is discussed briefly.
- Research Organization:
- Oregon Univ., Eugene, OR (United States)
- OSTI ID:
- 7175804
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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