WAVELENGTH SCANNING LIGHT SOURCE AND OPTICAL COHERENCE TOMOGRAPHY DEVICE

摘要

An optical coherence tomography device includes a wavelength scanning laser light source (10) provided with two Fabry-Perot resonators (13A, 13B) provided in a light path for laser oscillation. The values of FSR (free spectral range) of the Fabry-Perot resonators are set so as to be proximate to each other. The resonator length of at least one of the two Fabry-Perot resonators is periodically varied within a preset range to cause the two Fabry-Perot resonators (13A, 13B) to operate as a wavelength length varying filter of a narrow pass band capable of varying the selection wavelength by the vernier effect to output laser light that has wavelength temporally scanned. The optical coherence tomography device also includes an interference optical system (20) that causes the laser light output from the wavelength scanning laser light source (10) to be branched into light for reference and light for observation to be illuminated on an object for observation (60) and that generates interference light of reflected light of the light for observation illuminated on the object for observation (60) and the light for reference. The optical coherence tomography device further includes a signal processing means (50) that receives the interference light obtained from the interference optical system (20) for transforming the received interference light into an electrical signal to calculate the optical tomographic image information of the object for observation (60).