A deep portion visualizing endoscope comprises a flexible fiber bundle, into which a laser beam produced by a frequency-sweep single frequency laser beam source is entered. The laser beam is irradiated from a radiating end of the fiber bundle to the region inside of a sample to be viewed,...http://www.google.com.au/patents/US5716324?utm_source=gb-gplus-sharePatent US5716324 - Endoscope with surface and deep portion imaging systems
Endoscope with surface and deep portion imaging systems
