A single–frequency automatically tunable cw dye laser automatically tuned to a fixed frequency (with an error of 500 MHz) has been developed. A single–frequency regime of lasing is achieved by the use of an automatic frequency tuning system. Frequency is measured by the Spektron–IV device. CAMAC instrumentation and a computer are used to control a lasing frequency. The laser can be used as part of laser opto–acoustic spectrometers and spectrophotometers.