According to the equations of three interacting plane waves (without absorptions and losses) and small-signal approximation, the calculations of spectral and angular acceptance half-widths are done with KDP, ADP, BBO, LiIO3, LiNbO3 for frequency doubling, tripling and quadrupling (λ1=1.064μm), so that we can select crystals used for frequency-conversion in a wide-band Nd: glass laser. The doubling equations for wide-band mode-locked lasers are given. The calculated enhancement factor 2N3+N/3 of SH shows that processes of side-band sum-frequency for mode-locked laser pulse are of important roles.