It is found that the phase-conjugate fifth-order polarization beat is due to the interference between fifth- and fifth-order optical polarizations, the beat signal oscillates not only temporally but also spatially, and the measurement accuracy for laser absolute frequency could reach the same order of magnitude as the laser linewidth.

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It is found that the phase-conjugate fifth-order polarization beat is due to the interference between fifth- and fifth-order optical polarizations,the beat signal oscillates not only temporally but alsospatially,and the measurement accuracy for laser absolute frequency could reach thesame order of magnitude as the laser linewidth.

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For the complicated beat frequency signal processing, the thesis proposes a new beat frequency measurement method, that is window sampling method.

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Beat one's breast; beat one's foot rhythmically.

敲打某人的胸部；有節(jié)奏地敲打步調(diào)。

Conga has three shuffle7 steps on the beat, followed by a kick that is ahead of the fourth beat.

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The deckle beats to starch the process inside wet heavy can'ton-line examination, but its with beat to starch the process theinside can measure directly of a few amount of physicses hascertainly of to should relate to, these physicses measures is tobeat to starch the discharge P and beat to starch the density C andbeat to starch the electric current respectively, with original andwet heavy worth g0, they with wet heavy an esse complicated butcertain relation.

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Sinus bradycardia or sinus bradycardia with arrhythmia,sino-auricular block,sinus stopping beat with junctional abnormal beat occurred in15cases;Sinus bradycardia with ST-T changes occurred in10cases,ab-normal excitation（including ventricular,supraventricular premature beat with tachycardia）occurred in6cases the cardiac function of9cases were checked up:stroke volume,cardiac indexand ejection timewere normal or on the low side.The colour Doppler showed that excrescence in tricuspid valve of3cases and the diagnosis was infectivity bacterial endocarditis.

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On the basis of analyzing the output signal of a two wavelength beat-wave absolute distance interferometer, this paper proceeds from the realities of the aiming method of the beat-wave interferometer, conducts an analytical investigations on the dependence of the aiming accuracy of the beat-wave interferometer on laser dual-line output power equilibrium, propose two new concepts-a basic aim blind area and a blind area expansion, and establishes an analytical expression between the blind area expansion and the relative power difference of laser dual lines.

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After transverse Zeeman effect is introduced to reduce the mode coupling, the laser could produce two orthogonal linear polarized components with 5MHz beat frequency. The effect of the magnetic field's direction to generation of the dualfrequency and the polarization property of the laser is investigated Based on theoretical study and experimental investigation to the beat frequency tuning character, a novel method for stabilizing the laser beat frequency is brought forward.

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