The characteristics of a segmented hollow-cathode He-Cu+ 781 nm laser are modified by varying the cathode to anode area ratio (C/A), in steps from 3.0 to 0.33, for a fixed bore diameter of 4 mm. The discharge voltage for a given current to pressure ratio, and consequently the small-signal gain and multimode output power for a given current, are significantly increased when C/A is reduced. For a given gain in excess of 20% m-1, the input power decreases slightly as C/A is reduced. However, for a given multimode output power, the input power is almost independent of C/A (0.33 to 2.0). For a gain of 60% m-1 the current density decreases from 450 to 340 mA cm-2 when the area ratio is reduced from 3 to 0.5.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films