Act, the linewidth broadening system is made use of to modulate the intensity distribution with the laser in the spectrum to weaken recoil effects. The linewidth in the continuous wave laser is often much less than 1 MHz, that is theoretically regarded as 0 MHz. We anticipate that there is a laser modulation technology which will be applied to broaden the laser linewidth from 0 MHz or tens of kHz to above 1 MHz. As much as now, Chamoun and Digonnet [7] have proposed a Gaussian white noise (GWN) phase modulation to broaden the laser linewidth which uses the linear Pockels effect in the electro-optic crystal by an external electric field. Its benefits lie in that the laser wavelength can stay stable, plus the modulated laser linewidth is independent of the organic linewidth with the laser. By the theoretical models and also the numerical simulations, the return photons from the sodium laser guide star excited by the continuous wave (CW) laser are calculated. The study benefits show that the linewidth broadening technique markedly increases the return photons. Within the approach on the study, theoretical models are presented in Section two. The steady state solution of the two-level Bloch equation is applied within the excitation probability of sodium atoms. The typical spontaneous emission price of excited sodium atoms is introduced. The expressions of return photons and spot sizes on the sodium laser guide star are described. In Section three, the numerical approach is described in detail plus the parameters are listed. In Section 4, benefits from the numerical simulations are obtained. Effective evidence indicates that linewidth broadening can proficiently weaken the recoil effects. Then, the option of your optimal linewidth broadening is analyzed, and relational expressions among laser intensity and typical spontaneous emission prices are obtained. In Section five, we discuss the D-?Glucosamic acid custom synthesis effects of linewidth broadening on the return photons and spot sizes on the sodium laser guide star and look at the linewidth broadening for the re-pumping laser. In unique, we additional simulate the influence of linewidth broadening on the recoil effects in the sodium laser guide star inside the case of your multi-mode laser. Lastly, we summarize our perform, including the optimal range of laser linewidth broadening and the influence around the returned photons in the sodium laser guide star. two. Theoretical Models The excitation on the sodium laser guide star requirements to launch the sodium laser towards the mesospheric sodium layer. Below the usual situations, the spectrum center in the laser is necessary to aim in the center frequency on the Doppler Lactacystin Cancer shifts on the sodium atom below the thermal equilibrium states. The single-mode mono-mode CW laser is applied inside the sodium laser guide star and has the highest intensity within the spectrum center. A great deal of sodium atoms move to a higher Doppler shift soon after absorbing laser photons, as well as the Doppler shift increases 50 kHz. This course of action might be described as follows [8]: v D = D + h/ 2 m Na (1)= D + 50 kHz,exactly where v D is definitely the Doppler shift soon after a sodium atom absorbs a photon, v D would be the former Doppler shift, h may be the Plank continuous, is definitely the 589.159 nm wavelengths, and m Na is the mass of a sodium atom. “+” denotes the motion of a sodium atom together with the path of laser propagation, and “-” denotes the opposite one. We look at the scenario of two power levels for interactions involving the circularly polarized laser and sodium atoms. This approach is described by the optical.