Translation guide
The optic axis is a technical term in optics and crystallography referring to a direction along which light propagates without birefringence. In Japanese, it is expressed with specific scientific terms.
The line passing through the center of a lens or mirror and perpendicular to its surface, along which light rays travel without deviation.
A direction in an anisotropic crystal along which ordinary and extraordinary rays travel at the same speed, so no double refraction occurs.
Both can translate 'optic axis'. 光軸 is the general term for optical systems (lenses, fibers). 光学軸 is preferred for crystallography to avoid ambiguity. In many contexts they overlap, but 光学軸 emphasizes the wave-optics aspect.
Adjust the optic axis of the lens.
Specifically used for the optic axis of birefringent crystals in mineralogy and crystallography. Sometimes interchangeable with 光軸, but 光学軸 is more precise in this context.
方解石の光学軸に沿って光が進むと、複屈折は起こらない。
When light travels along the optic axis of calcite, birefringence does not occur.
Also used in crystallography, but 光学軸 is more specific. 光軸 is broader and can refer to any optical axis.
この結晶の光軸方向を求める。
Determine the direction of the optic axis of this crystal.