HIGH-SPEED WAVELENGTH SELECTIVE FILTER FOR EQUALLY INTERVAL WAVE-NUMBER SWEEPING OF TUNABLE LASER
A high speed optical filter for equally spaced wave number of a wavelength tunable laser is provided to improve the speed of a final image frame in an SS-OCT(Swept Source Optical Coherence Tomography) system by oscillating a signal of the wave number separated with the equal interval. A diffractive...
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Zusammenfassung: | A high speed optical filter for equally spaced wave number of a wavelength tunable laser is provided to improve the speed of a final image frame in an SS-OCT(Swept Source Optical Coherence Tomography) system by oscillating a signal of the wave number separated with the equal interval. A diffractive grating divides the light form a laser medium according to wavelength and diffracts the light. A lens(23) refracts the light from the diffractive grating and progresses the light in parallel. A mirror(24) reflects the spectrum bar in which the incident light from the lens is formed. A rotary disk(25) is arranged to offset the spectrum bar from the rotation center between the lens and the mirror and rotates with a constant angular velocity. A plurality of slits(25a) are formed on the rotary disk and passes through only the predetermined part of the spectrum bar. |
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