Pulse-forming and line-broadening in AM mode locking of the TEA-CO&amp;lt;inf&amp;gt;2&amp;lt;/inf&amp;gt;laser

Witteman, W.J.; Olbertz, A. H. M.

doi:10.1109/jqe.1977.1069369

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…In this way one predicts a line width that decreases and consequently a pulse width that increases with increasing helium percentage. This, however, is not observed experimentally [5].…”

Section: Introductionmentioning

confidence: 80%

“…This observation may be understood from the fact the a hot-band and a sequence-band transition are very close to this regular transition, so that the effective gain for the P(20) is favoured as compared with the other ones. We described previously [5] how by detuning an AM modelocked system information can be obtained on the line profde and the pulse width. The detuning is achieved experimentally by stabilizing the modulation frequency and detuning the cavity mode separation frequency by merely changing the mirror distance.…”

Section: Pulse-width Measurementsmentioning

confidence: 99%

“…The detuning is achieved experimentally by stabilizing the modulation frequency and detuning the cavity mode separation frequency by merely changing the mirror distance. It is shown that the frequency band width of the mode spectrum of such a mode-locked system is less than 10% of the line width [1,5]. This means that in the frequency region of interest we may to a very good approximation represent the gain and the phase retardation of such a line profile by a quadratic and linear form respectively.…”

Section: Pulse-width Measurementsmentioning

confidence: 99%

“…Furthermore, it is observed that the maximum positive and negative frequency shift from the synchronized frequency is equal within a few percent. We derived [5] the relation between the m~tximum detuning x m and the second derivative G 2 of the line profile, which is given by…”

Section: Pulse-width Measurementsmentioning

confidence: 99%

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Mode-locked pulses in multi-atmosphere CO2 lasers

Olbertz¹,

Witteman²

1979

Optics Communications

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The present paper deals with AM mode locking of multiatmosphere CO2 lasers. We measure the effective linewidth in the laser mixtures and deduce from these data the pulse width. The method is based on determining the maximum frequency shift from the synchronized frequency. The advantage of this method is that the results are not influenced by time constant of detector and display. The results were verified by direct measurements of the pulse widths in mixtures up till three atmospheres. The pulse widths and effective line widths of the P(20) transition are determined for the usual CO2 laser mixture up till 6 atm. We observe that helium has a large effect on the pulse width. The width decreases with increasing helium percentage at all pressures investigated. We suggest that this has to do with the overlap of a sequence-band transition and that the effect of sequence bands depend ion the helium percentage.

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“…In this way one predicts a line width that decreases and consequently a pulse width that increases with increasing helium percentage. This, however, is not observed experimentally [5].…”

Section: Introductionmentioning

confidence: 80%

Section: Pulse-width Measurementsmentioning

confidence: 99%

Section: Pulse-width Measurementsmentioning

confidence: 99%

Section: Pulse-width Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Mode-locked pulses in multi-atmosphere CO2 lasers

Olbertz¹,

Witteman²

1979

Optics Communications

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show abstract

“…The difference in group velocity results in a time delay between the pulses of the rotational lines. For steady state these time delays can be calculated [9] and are found to be on the order of a few tenths of a nanosecond, which is apparently negligible.…”

Section: Methodsmentioning

confidence: 95%