100/cm scan range single-mode dye laser

A wide scanning of over 100/cm of a single-mode Rhodamine 6G dye laser with a very simple control system is demonstrated. The repeated sweeping of the laser cavity and an internal etalon, along with a continuous tuning of a birefringent filter, are used in the system. By locking the cavity to the internal etalon by an integrating servoamplifier which has an auto-reset function, mode jumps during a sweep are eliminated. Good overall performance of the system is demonstrated by a measurement of the I2 absorption spectrum of the Doppler-limited resolution. It is shown that with a constant rotational speed of the birefringent filter, the jumpless scanning is extendable up to 230/cm.