Abstract

A CO2 laser may oscillate at any one of many possible lines. As the cavity length of such a laser is varied over a distance of λ/2, a large number of lines oscillate one at a time in succession. The listing of the identities of the sequences of lines constitutes a signature of the laser and is a matter of practical importance in the operation of these lasers in remote controlled applications without the use of mode-selecting elements in the cavity of the laser. We report here a rather remarkable result, namely, that the lines P(20) and P(16) of the 10.4-μm band compete so effectively relative to all the other modes that they can be relied on to oscillate over quite a wide gain curve and for a wide range of operating conditions.

© 1971 Optical Society of America

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Figures (28)

Fig. 1
Fig. 1

Experimental arrangement.

Fig. 2
Fig. 2

Sequence of lines with 18-Torr pressure and 11-mA discharge current.

Fig. 3
Fig. 3

Sequence of lines with 17-Torr pressure and 10-mA discharge current.

Fig. 4
Fig. 4

Sequence of lines with 16-Torr pressure and 10-mA discharge current.

Fig. 5
Fig. 5

Sequence of lines with 15-Torr pressure and 8-mA discharge current. * Indicates lines of the 9.4-μm band.

Fig. 6
Fig. 6

Sequence of lines with 14-Torr pressure and 7.8-mA discharge current. * Indicates lines of the 9.4-μm band.

Fig. 7
Fig. 7

Sequence of lines with 13-Torr pressure and 6.8-mA discharge current. * Indicates lines of the 9.4-μm band.

Fig. 8
Fig. 8

Sequence of lines with 12-Torr pressure and 6-mA discharge current.

Fig. 9
Fig. 9

Sequence of lines with 11-Torr pressure and 5-mA discharge current.

Fig. 10
Fig. 10

Sequence of lines with 10-Torr pressure and 4.4-mA discharge current.

Fig. 11
Fig. 11

Sequence of lines with 15-Torr pressure and 11-mA discharge current.

Fig. 12
Fig. 12

Sequence of lines with 15-Torr pressure and 10-mA discharge current.

Fig. 13
Fig. 13

Sequence of lines with 15-Torr pressure and 9-mA discharge current. * Indicates lines of the 9.4-μm band.

Fig. 14
Fig. 14

Sequence of lines with 15-Torr pressure and 8-mA discharge current. * Indicates lines of the 9.4-μm band.

Fig. 15
Fig. 15

Sequence of lines with 15-Torr pressure and 7-mA discharge current. * Indicates lines of the 9.4-μm band.

Fig. 16
Fig. 16

Sequence of lines with 15-Torr pressure and 6-mA discharge current.

Fig. 17
Fig. 17

Sequence of lines with 15-Torr pressure and 5-mA discharge current.

Fig. 18
Fig. 18

Sequence of lines with 15-Torr pressure and 10-mA discharge current, cavity length L.

Fig. 19
Fig. 19

Sequence of lines with 15-Torr pressure and 10-mA discharge current, cavity length increased to L + 100 μm.

Fig. 20
Fig. 20

Sequence of lines with 15-Torr pressure and 10-mA discharge current, cavity length increased to L + 200 μm.

Fig. 21
Fig. 21

Sequence of lines with 15-Torr pressure and 10-mA discharge current, cavity length decreased to L.

Fig. 22
Fig. 22

Sequence of lines with 15-Torr pressure and 7-mA discharge current, fresh gas fill.

Fig. 23
Fig. 23

Sequence of lines with 15-Torr pressure and 6-mA discharge current, fresh gas fill. * Indicates lines of the 9.4-μm band.

Fig. 24
Fig. 24

Sequence of lines with 15-Torr pressure and 6-mA discharge current, polished NaCl flat in cavity.

Fig. 25
Fig. 25

Sequence of lines with 15-Torr pressure and 6-mA discharge current, polished NaCl flat in cavity, small temperature gradient in NaCl.

Fig. 26
Fig. 26

Sequence of lines with 15-Torr pressure and 6-mA discharge current, polished NaCl flat in cavity, large temperature gradient in NaCl.

Fig. 27
Fig. 27

Sequence of lines with 30-Torr pressure and 10-mA discharge current.

Fig. 28
Fig. 28

Sequence of lines with 25-Torr pressure and 10-mA discharge current.

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