The efficiency of absorption of laser light by a deuterium plasma is an important parameter for the laser/pellet fusion application. A computer calculation model is described and used to calculate intense light absorption over the wavelength range 0.1 μm ≤ λ ≤ 10.6 μm for two different pulse durations. The calculation includes both collisional absorption and anomalous absorption by means of the parametric ion-acoustic instability. The general result for all of the computer calculations, supported by an analytic model, is that the absorption efficiency increases as the wavelength is decreased.