Q-Switched CO2 lasers

Hi. Somebody can aswer or at least help me in aswer the follonwing question? In a Q-Swtched CO2 laser system, what is the optimal time interval to maximize the pulse peak power? Becasue in some literature it says that if the time of low Q (high losses) is larger than the CO2 (001) vibrational laser level the population invertion is depleted by spontanoues emission and if it shorter than the 001 lifetime the population inversion can not achieve the maximun value. However, in other literature it is reported that the low Q value should be of the order of the 0110 laser lower auxiliar level lifetime. Sombody has clear this issue?

I refer to the optial interval time of the cavity obturation with a chopper or other intracavuty element.