提出双折射调谐器设计的等色图方法，给出原理。分析表明当晶片光轴处在以折射光线为轴线、顶角为４５°的圆锥面上时，双折射调谐器具有最快的波长调谐速率；当光轴位于过折射光线并与入射面成４５°或１３５°的平面内时，调谐器抑制非所需波长的能力最强。由此给出光轴相对晶片表面的两个优化取向，对石英晶片它们分别为１８．７１２°和５９．９２２°。文中还给出了三块晶片组合的调谐器的设计例子，对其调谐特性进行了简要的讨论。 Propose the isochromatic graph method of birefringent tuner design and give the principle. The analysis shows that the birefringent tuner has the fastest wavelength tuning rate when the optical axis of the wafer is on a conical surface with refracted light axis of 45 ° and apex angle of 45 °. When the optical axis is in the refracted light and forms 45 with the incident surface ° or 135 ° in the plane, the tuner to suppress the non-desired wavelength of the strongest. This gives two optimized orientations of the optical axis relative to the wafer surface, which for the quartz wafer are 18.712 ° and 59.922 °, respectively. The article also gives the design example of the tuner of the three chip combination, and gives a brief discussion of its tuning characteristics.