Optical system and optical apparatus capable of switching...

Details Optical system and optical apparatus capable of switching... Optical system and optical apparatus capable of switching...

2007-06-26

2007-06-26

Turner, Samuel A. (Department: 2877)

Optics: measuring and testing

By light interference

For dimensional measurement

C356S479000

Reexamination Certificate

active

10006621

ABSTRACT:
An optical system and optical apparatus prevent degradation of the S/N ratio due to switching between OCT and OCM observation modes and attain a high S/N ratio in both the observation modes. The optical system includes a light source1and a light-branching member2for branching light from the light source1into a reference light path and a signal light path. An objective3is placed in the signal light path. A light-scanning system5scans light in the signal light path with respect to a sample4placed in the signal light path. A beam diameter changing optical system6changes the beam diameter of light entering or exiting the light-scanning system5. A light-combining member7combines together the reference light path and the signal light path. A light-detecting element8detects light combined by the light-combining member7.

REFERENCES:
patent: 5321501 (1994-06-01), Swanson et al.
patent: 6111645 (2000-08-01), Tearney et al.
Izatt et al., “Optical Coherence Microscopy in Scattering Media,” Optics Letters, vol. 19, No. 8, Apr. 15, 1994, pp. 590-592.
IZatt et al., Optical Coherence tomography for Biodiagnostics, Optics & Photonics News, May 1997, pp. 41-47, 65.

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