M. Jánossy

Near infrared CW laser oscillation in Cu II

Abstract CW laser oscillation was observed at the 7808 A transition of Cu II in Heue5f8Neue5f8Cu, Heue5f8Arue5f8Cu, and Heue5f8Krue5f8Cu hollow cathode discharges. The role of the noble gas mixture in obtaining laser action is discussed.

Noble gas mixture CW hollow cathode laser with internal anode system

Abstract A hollow cathode discharge tube with internal anodes was found to operate at significantly higher discharge voltages than a conventional HCD. A laser tube having internal anodes was constructed and laser operation was investigated in He-Kr, He-Ar and He-Ne-Xe gas mixtures. Due to the increased voltage low threshold currents and increased output power were obtained at the 4694 A Kr ion and the 4765 A Ar ion transitions. CW laser oscillation was observed for the first time at the 5314 A and 4863 A transitions of Xe II.

CW Cu II laser in a hollow anode-cathode discharge

Abstract CW laser operation on near infrared transitions of Cu II was investigated in a high voltage hollow cathode discharge tube of 19 cm active length. The high voltage was obtained by a special anode system placed inside the cathode. Threshold current for the strongest 7808 A laser line was 0.4 A. At a discharge current of 2.4 A a multiline output power of 30 mW was obtained on six transitions between 7404 and 7896 A.

CW aluminum ion laser in a high voltage hollow cathode discharge

Abstract Laser oscillation on transitions of Al II was investigated in a large diameter hollow cathode discharge where Al vapour was produced by cathode sputtering. The special internal anode system used considerably increased the tube voltage and resulted low threshold currents.

Investigation on a continuous wave 4416 Å cadmium ion laser

Measurements have been carried out on the output power, gain and oscillation bandwidth of a continuous wave 4416 A Cd ion laser. Optimum parameters for laser operation are obtained, the results of measurements indicate the possibility of two processes in the excitation mechanism.

He-Kr ion laser in a d.c. hollow cathode discharge

Abstract Laser oscillation at the 469.4 nm and 431.8 nm transitions of Kr II was obtained in a d.c. hollow cathode He-Kr discharge. Optimum He and Kr partial pressures were found to depend on discharge current; a gain of 6.7%/ m and an output power of 5 mW was measured at 469.4 nm.

Laser oscillation at 4416 Å in a Ne-Cd discharge

Abstract CW laser oscillation has been obtained on the 4416 A transition of Cd(II) in a Ne-Cd discharge excited by 50 Hz “alternating current”

Endoergic and resonant charge transfer excitation in He-Cu discharge

The intensity of Cu-II lines with upper level energies near and above those of the He ion was measured as a function of He pressure in a Cu hollow cathode tube. In this tube at low pressures the negative glow could expand above the cathode. The maximum intensity of the Cu-II 493.1 nm line was found in the low voltage, high pressure hollow cathode discharge region in accordance with a resonant charge transfer excitation process. Enhancement of the intensity of the Cu-II 436.5 nm and 417.9 nm lines was observed in the cathode glow at low pressures. Excitation of these lines is attributed to endoergic charge transfer collisions between He ions accelerated by the 2 kV tube voltage and ground state Cu atoms. The cross-section for this reaction exciting the 436.5 nm line was estimated to be of the order of 10−17 cm2.

New cw laser lines in a noble gas mixture high voltage hollow cathode discharge

Abstract New Kr II and Ar II cw laser transitions were observed in He-Kr and He-Ar high voltage hollow cathode discharges. Excitation mechanism is believed to be second kind collisions between He 2 3 S atoms and ground state ions. An output power of 100 mW was obtained at the 4694 A line of Kr II.

Output characteristics of a hollow cathode He-Cd laser

Abstract Optimum discharge conditions, gain and oscillation linewidth were determined for the blue (4416 A), green (5378, 5337 A) and the red (6360, 6355 A) transitions of a hollow cathode He-Cd laser. A total peak output power of 75 mW has been obtained at 5378 and 5337 A. Mode investigations showed that the green and red transitions operate in a single axial mode, while the blue one does not.