The characteristics of the N2O laser are presented in both CW and Q-switched operations. The single-wavelength operation is obtained in the CW operation and Q-switched operation with a rotating-mirror. The Q-switched laser pulse has a 150-W output peak power with a width of 0.7 µs. The self-mode locking is also observed with the rotating-mirror Q-switching. The passive Q-switching is achieved on the P(13) and P(29) lines by using NH3 gas as a saturable absorber. The peak power of 5 times the CW power is obtained. The passive Q-switching on the P(29) line is attributed to the asQ(14, 13) line of NH3.
We present an analysis of a two-photon double-beam bistable device, in the dispersive and high-finesse limits. The expressions for the mean fields inside the cavity are given above the destabilization thresholds, and quantum fluctuations of the outcoming fields are analyzed below these thresholds. It appears that this device yields several new quantum noise reduction schemes, which are closely related to the mean fields behaviour.
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