Construction and measurement of an experimental He-Se laser are described. Laser tube configurations are improved to prevent the Se vapor from diffusing toward the Brewster windows.
The laser, which has an effective discharge region of 70cm in length and 2.8mm in diameter, yields 23mW on 11 lines lasing simultaneously.
Saturation current of a He-Se laser is considerably higher than that of a He-Cd laser and reaches up to 220_??_460mA with oven temperatures between 210° to 250°C.
This result is attributed to the energy difference between Hell (
2S1/2) and He (
3S1), which are used for the excitation of SeII and CdII, respectively.
We have mainly analyzed the relation between Se density
nse (temperature) and saturation current
IS and it has turned out that
Is2 is linear to
nse with a good approximation. By selecting with a prism, we obtained a few mW power output in each of the 4976, 4993, 5068, 5176, 5228, 5305 Å lines.
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