The influence of losses caused by birefringent in YAG-crystal on generation of waves of 1064.15 and 1061.5 nm length

The article aims at determination of the required difference of losses between wave lengths of 1064,15 and 1061,5 nm caused by birefringent in YAG-crystal on generation of 2 wave lengths. The authors adduce a solution of the equation system of Tang – Stats – Demars, describing the generation by Nd:YAG-laser, having three amplification contours on wavelengths of 1064,15, 1064,4 and 1061,5 nanometers and generating from two stark sublevels of a multiplet $^4 F_{3/2}$. It is shown that the mode of dual wavelength generation occurs when the difference of intracavity losses for wavelengths of 1064,15 and 1061,5 nanometers exceeds 0,07. Such level of losses may occur in presence of birefringement in YAG crystal and in presence of a polarizing element inside a resonator (Brewster window). The calculation results show that for stable generation of two wavelengths of 1064,15 and 1061,5 nanometers it is sufficient to have a difference of losses for said wavelengths being 0,07.