Experimental study of the injection-locked continous-wave ring dye laser.

We present the first reported experimental study of the properties andcharacteristics of the injected cw ring dyelaser together with a new method of injection locking for cw sources. The injection thresholds and the intracavity powers below and above threshold have been investigated as a function of the pump power, the injecting radiation power, and the frequency detuning. The experimental results, in good agreement with a theoretical analysis previously proposed, demonstrate the possibility to obtain higher single-frequency powers.

Generation of continuous-wave radiation near 243 nm by sum-frequency mixing in an external ring cavity.

We have generated up to 1 mW of single-mode cw ultraviolet radiation between 243 and 247 nm by mixing the outputs of an ultraviolet argon-ion laser at 363.8 nm and a red LD700 dye laser in ammonium dihydrogen phosphate. The dye-laser intensity within the crystal is enhanced by using an actively locked passive ring cavity. Wavelengths near 243.1 nm are of particular interest for the high-resolution two-photon spectroscopy of atomic hydrogen.

Generation of continuous-wave ultraviolet radiation by sum-frequency mixing in an external ring cavity.

We have generated several milliwatts of single-frequency cw UV radiation near 265 nm by mixing the outputs of a rhodamine 6G ring dye laser and a 488-nm argon-ion laser in a crystal of ammonium dihydrogen phosphate. The dye-laser intensity inside the crystal was enhanced by a frequency-locked passive ring cavity, yielding at least a tenfold improvement in UV power over earlier mixing schemes. An envisioned extension to wavelengths near 243 nm is of particular interest for high-resolution two-photon spectroscopy of atomic hydrogen.