Understanding the characteristics of gain saturation for homogeneously broadened laser medium from the point of view of the bandwidth

0Citations
Citations of this article
10Readers
Mendeley users who have this article in their library.

Abstract

It is very important to understand the characteristics of gain saturation for homogeneously broadened laser medium. Assuming a Lorentzian lineshape function with a linewidth of ΔνH, we have derived the analytical functions of the gain coefficient under three different conditions: 1) a small and 2) a large signal incident on the medium respectively, and 3) a small signal accompanied by a large signal simultaneously incident on the medium. We have found that the bandwidth Δν of the gain coefficient is equal to the linewidth ΔΝH for condition 1) and 3) while it is Δν=√1+Iv1/IsΔνH for condition 2). Here, Iv1 and Is are the intensity of the large signal and the saturation intensity at the center frequency V0, respectively. The reasons are also presented for such results. For condition 2), gain saturation effect is strongly dependent on the frequency of the large signal: the more the frequency deviates from the center frequency, the weaker the gain saturation effect. This results an increase of the bandwidth. For condition 3), the intensity of the large signal only changes the distribution of populations on the upper and lower energy levels. Hence, the shape of the gain coefficient does not change with the gain reduction of the small signal, thus, its bandwidth remains the same. © ETOP 2007.

Cite

CITATION STYLE

APA

Du, G. (2007). Understanding the characteristics of gain saturation for homogeneously broadened laser medium from the point of view of the bandwidth. In Optics InfoBase Conference Papers. Optical Society of America. https://doi.org/10.1117/12.2207474

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free