X2Σ→B2Σ absorption band of HgBr: Optically pumped 502-nm laser

Greene, D. P.; Killeen, K. P.; Eden, J. G.
May 1986
Applied Physics Letters;5/5/1986, Vol. 48 Issue 18, p1175
Academic Journal
The X2Σ+1/2→B2Σ+1/2 absorption band of HgBr has been observed in the afterglow of a pulsed Ne-N2-HgBr2 discharge. Peaking in the ultraviolet (UV) near 350 nm, this continuum degrades slowly to the red and at 410 nm the absorption coefficient is 30% of its maximum value. Upon exciting the X→B band with an XeF (351 nm) or frequency tripled Nd:YAG (355 nm) laser, intense lasing is observed in the blue-green (λ∼502 nm). For λpump=351 nm, the energy conversion efficiency (UV to green) is 22% which corresponds to a photon conversion efficiency of 32%. The quantum efficiency for this four level system is 71%.


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