Single mode operation of a continuous tunable dye laser

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We describe a tunable dye laser operating continuously in the range 570 nm to 620 nm. With a single prism and an intracavity etalon, single mode operation is obtained with a short-term bandwidth of less than 4 × 10 -5nm (35 MHz) and a long-term stability of better than 2 × 10 -4nm (180 MHz). At the center of the tuning range the single-mode power is 40 mW when the dye laser is pumped by a 1.3 watt argon