In this study, second-order coherence and its frequency-dependent characteristics and the photon statistical properties of the two-mode He-Ne laser field are investigated.
According to the quantum theory of coherence, we have derived the degree of second-order coherence, g(2) (τ), and the formula of it's time-spectrum in a two-mode laser, and given the results under three specific cases. The second-order coherence and it's time-spectrum characteristics of a two-mode laser isanalysed, the periodicity and the photon anticorrelation effect of g(2)(τ) are indicated, and the possible application of the time-spectrum characteristics of g(2)(τ) in a two-mode He-Ne laser is discussed.