Gain dynamics of the 4.3 ?m CO2 laser

Brimacombe, R. K.; Reid, J.; Znotins, T. A.

doi:10.1007/bf00691775

Cited by 10 publications

(2 citation statements)

References 39 publications

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“…Furthermore, many studies that are focused on the vibrations of CO 2 are done in the field of CO 2 lasers, as the asymmetric stretch vibration plays a key role in its operation [27]. Often, research is done in a static environment [28][29][30][31][32][33][34][35], while dynamic measurements [36][37][38][39] can aid in the understanding of the vibrational kinetics of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Excitation and relaxation of the asymmetric stretch mode of CO₂ in a pulsed glow discharge

Klarenaar

Morillo-Candas

Grofulović

et al. 2019

Plasma Sources Sci. Technol.

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The excitation and relaxation of the vibrations of CO 2 as well as the reduction of CO 2 to CO are studied in a pulsed glow discharge. Two diagnostics are employed: (1) time-resolved in situ Fourier transform infrared spectroscopy and (2) spatiotemporally resolved in situ rotational Raman spectroscopy. Experiments are conducted within a pressure range of 1.3-6.7mbar and a current range of 10-50mA. In the afterglow, the rate of exponential decay from the asymmetric stretch temperature (T 3 ) to the rotational temperature (T rot ) is found to be only dependent on T rot , in the conditions under study. The decay rate r -

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Section: Introductionmentioning

confidence: 99%

Excitation and relaxation of the asymmetric stretch mode of CO₂ in a pulsed glow discharge

Klarenaar

Morillo-Candas

Grofulović

et al. 2019

Plasma Sources Sci. Technol.

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“…As the small-signal gain in the 10 pm laser bands increases with increasing T3, much effort has gone into maximizing T3 in electrically-excited CO2 lasers [5], [ 6 ] .…”

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confidence: 99%

Polarization properties of photonic crystal fibers

Petersson¹,

Broeng²,

Hansen³

et al. 2006

2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference

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A pulsed 4.3 pm CO2 laser is used to optically pump mixtures of CO, and He, and create transient gain at 9 and 10 pm. A conventional CW COz laser operating on both regular and sequence bands measures this transient gain, and thus determines the v3 mode vibrational temperature T3. The measured values of T3 are generally much higher than those attained in discharge-excited COz. It is shown that a Treanor distribution must be used to describe the populations in the vj mode when dilute mixtures of COz in He are optically pumped to vg mode temperatures of 3000 to 4000 K. Under these conditions the sequence band gain coefficients are almost equal to those on the regular bands. The collisional relaxation of energy from the v3 mode shows evidence of fast V-Trelaxation at high values of T3, followed by a slower relaxation rate characteristic of the 00'1 population lifetime.In mixtures with high CO2 content, we measure 10 pn gain coefficients as large as 20 percent/cm on the regular bands and 5 percent/cm on the sequence bands. The high values of gain coefficient and T3 observed in the optically pumped system are attributed to the absence of electron de-excitation mechanisms which limit the excitation of the v3 mode in discharge-excited CO2.

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3W average power 4.3 μm CO2 laser

et al. 1991

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Gain dynamics of the 4.3 ?m CO2 laser

Cited by 10 publications

References 39 publications

Excitation and relaxation of the asymmetric stretch mode of CO₂ in a pulsed glow discharge

Excitation and relaxation of the asymmetric stretch mode of CO₂ in a pulsed glow discharge

Polarization properties of photonic crystal fibers

3W average power 4.3 μm CO2 laser

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Gain dynamics of the 4.3 ?m CO2 laser

Cited by 10 publications

References 39 publications

Excitation and relaxation of the asymmetric stretch mode of CO2 in a pulsed glow discharge

Excitation and relaxation of the asymmetric stretch mode of CO2 in a pulsed glow discharge

Polarization properties of photonic crystal fibers

3W average power 4.3 μm CO2 laser

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Product

Resources

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Excitation and relaxation of the asymmetric stretch mode of CO₂ in a pulsed glow discharge

Excitation and relaxation of the asymmetric stretch mode of CO₂ in a pulsed glow discharge