Frequency-doubled Cw Dye Laser Research Articles

Study of synchronously mode-locked and internally frequency-doubledcw dye laser

The analysis of the characteristics of a synchronously mode-locked and internally frequency-doubled dye laser is presented. Dependence of dye laser pulse characteristics on the cavity length mismatch of the pump laser and dye laser is studied. Variation of the minimum pulsewidth with intracavity bandwidth and the harmonic conversion efficiency is presented in the form of graphs.

Quantum Defects of the n2P1/2,3/2 Levels in 39K I and 85Rb I

The energies of the n2P1/2,3/2 level series in 39K (9 ⩽ n ⩽ 21) and 85Rb (13 ⩽ n ⩽ 68) have been measured using frequency-doubled cw dye laser radiation, a thermionic detector and a high-precision vacuum-wavemeter. By means of a Rydberg-Ritz fitting procedure accurate quantum defect data and ionization limits are given. The ionization limits are in agreement with the limits derived from energy data of other l-series which have been measured recently with laser spectroscopy techniques.The compact Rydberg-Ritz formulas can serve as handy secondary wavelength standards with high precision.A compilation of the most accurate Rydberg-Ritz coefficient of all alkali term series with l ⩽ 3 is presented and the present status of alkali quantum defect data is discussed. This set of data includes also recent measurements of 133Cs n2S1/2 and n2D3/2,5/2 levels and of some low-lying 7Li levels.

Analysis of a synchronously mode-locked and internally frequency-doubled CW dye laser

We present analytical studies of a synchronously mode-locked and internally frequency-doubled CW (SMLFD) dye laser. The analysis describes the cavity detuning behavior of the pulse duration and the square of its peak intensity (the signal intensity of the autocorrelation trace) in terms of system parameters for different lengths of the intracavity crystal. The results predict the broadening of the pulse duration with the increase of the crystal length even though the condition of the group velocity matching is satisfied. It is shown that the prediction is in good agreement with the experimental results of the SMLFD rhodamine 6G laser with an ADP crystal in the cavity. Furthermore, the variation of the minimum pulse duration at the optimum cavity length as a function of the harmonic conversion efficiency is derived.

Laser-induced fluorescence measurement of the vibrational distribution of CS formed in the reaction O + CS 2 → CS + So

A frequency-doubled cw dye laser has been used to determine the initial vibrational distribution of CS formed in the reaction O + CS 2 → CS + SO by application of laser-induced fluorescence. The A 1¶—X 1σ + system of CS was excited, and rotationally resolved spectra of a number of bands measured. The vibrational distribution found for υ = 0–2 is 1.0:0.27:0.11, yielding a value of 6% for the fraction of reaction exoergicity entering vibration of this product. No evidence of high product rotational excitation wss detected for a reaction pressure 5 × 10 −3 Torr.

A tunable, frequency-doubled cw dye laser using an RDP crystal

We report a c.w. intracavity, frequency doubled, rhodamine B dye laser using an RDP crystal 5 cm long. Generated uv powers up to 15 mW are obtained in a single direction with a linewidth of 2 GHz over the range 314–318 nm. A conversion efficiency of about 1.25 × 10 -3 W -1 is measured.

Detection of the Rydberg states of rubidium using a frequency doubled CW dye laser

A sensitive method of detecting Rydberg atoms of Rb is described. The excitation source is a continuous-wave frequency doubled dye laser and detection is by a spacecharge limited thermionic triode. By applying a small electric field 2S, 2P and 2D series can be excited directly from the ground state. Term value for the 2S and 2D series up to 54 2S and 52 2D have been measured using the 2P states as references.