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Comparison between four-level model and six-temperature model on the description of a simple mechanical Q-switched laser
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10.1063/1.2218271
/content/aip/journal/jap/100/2/10.1063/1.2218271
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/2/10.1063/1.2218271
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic setup of mechanical Q-switched laser: G, the grating; M1, M2, focusing mirrors; CP, the chopper; ZS, window; LT, laser tube; OPM, the output mirror.

Image of FIG. 2.
FIG. 2.

Laser output pulse wave form at the pulse repetition of .

Image of FIG. 3.
FIG. 3.

The schematic diagrams of the two models: (a) Energy level structure related with laser dynamics for a molecule of 4LM. Levels 1 and 2 are the lasing levels. denotes the number of rotational levels involved in each manifold which related with laser levels, and denote the relaxation rates in or out of the lasing levels; (b) schematic energy-level diagram for 6TM, including collision processes. Continuous, arrowed lines denote V-V transitions; dotted, arrowed lines denote V-T energy transfer processes; dashed, arrowed lines denote electron excitation processes.

Image of FIG. 4.
FIG. 4.

The time evolutions of the laser intensity and population inversion using the two models, respectively: (a) 4LM, solid line denotes the laser intensity and dashed line denotes the population difference, using =20, D0=0.30, and (b) 6TM, solid line denotes laser intensity and dashed one denotes energy difference between the two laser level, using , , and .

Image of FIG. 5.
FIG. 5.

The time evolutions of the laser intensity as a function of the rotational levels : (a) 4LM, using , , and (b) 6TM, , .

Image of FIG. 6.
FIG. 6.

Laser intensity in the cavity for different nondissociation coefficients using , for 6TM.

Image of FIG. 7.
FIG. 7.

Laser intensity in the cavity for different electron densities using , for 6TM.

Image of FIG. 8.
FIG. 8.

Comparisons of the experimental result and the two theoretical ones of the pulse wave form of the mechanical Q-switched laser using , for 4LM and , , and for 6TM.

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/content/aip/journal/jap/100/2/10.1063/1.2218271
2006-07-28
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comparison between four-level model and six-temperature model on the description of a simple mechanical Q-switched CO2 laser
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/2/10.1063/1.2218271
10.1063/1.2218271
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