[in Chinese], [in Chinese], [in Chinese]. The effects of dye concentration and pumping energy on the laser output are studied in a tunable quenching dye laser. Tunable range was measured. Some parameters were obtained in a coumarin 496 dye laser pjmped by a 308 nm XeCl laser.[J]. Acta Optica Sinica, 1996, 16(11): 1559