linear gain meaning in English

线性增益

( 4 ) the propagation of fgbs passing through a paraxial abcd optical system including the linear gain ( absorption ) media is studied , and a closed - form propagation formula of fgbs through the system is derived for the first time . the condition under which the transverse field is convergent in the linear media is derived from the closed - form propagation formula
( 4 )对平顶高斯光束在线性增益(或吸收)介质中的传输作了研究，首次得到了平顶高斯光束在线性介质中传输时的解析传物公式，从传融式出发得到了激光在线性介质中传输时的衣向场分椒级条~件。