Optical coherence tomography device and optical coherence tomography method

An optical coherence tomography device comprising:

• an objective lens configured to focus light from a light source onto a sample,
• wherein the optical coherence tomography device is configured to perform tomographic imaging of the sample based on interference between sample light, which is reflected light from the sample, and reference light, which is reflected light from a reference surface provided between the objective lens and the sample,
• the sample light and the reference light each pass through the objective lens,
• the objective lens is an Fθ lens, and
• the reference surface is a flat surface of a reference item satisfying the following relation (3):
• n×WD>nd>n×Zmax (3)
• wherein n represents a refractive index of the reference item;
• WD represents a working distance of the OCT device;
• and nd represents an optical thickness of the reference item;
• and Zmax represents a measurable distance expressed by the following relation (2):
• Zmax=c/(4δf) (2)
• wherein c represents the speed of light;
• and δf represents a frequency interval of OCT interference signal sampling.