We have developed a single mode fiber-light source at 1.8um band, which composes of thulium (Tm)-doped silica fiber
and optical devices used in telecommunication fields. This laser can be operated as a laser and broadband light source
selectively. The laser wavelength is tuned from 1765nm to 1812nm by adjusting an angle of a built-in band pass filter
(BPF). A maximum output power is 115mW at 1812nm, in the case that pump power is 363mW. The broadband light
source has a maximum power of 10mW, the peak wavelength of 1840nm and the full width at half maximum of 50nm.
By using these light sources, we have succeeded in obtaining images of test target by observing reflected light through
opaque liquid.
KrF excimer laser (248 nm) is expected to be the new therapeutic instrument in the medical field. However, there is still not the optical fiber which has enough durability for the high power energy of KrF excimer laser. We have developed the optical fiber for transmitting the light of the high power KrF excimer laser. This fiber consists of the pure silica core with a large amount of OH, and also has been specially treated during fabrication. As a result, the newly developed fiber has achieved to transmit the light of KrF excimer laser efficiently.
Endoscope for stereoscopic vision is in great demand for medical field to diagnose and treat disease parts of patients more precisely. The authors are convinced that the silica-based imagefiber is suitable for making a thinner fiberscope for stereoscopic vision and have developed an ultrathin fiberscope with silica-based imagefibers for stereoscopic vision. The diameter of fiberscope is only 2 mm with two transmitting systems that consist of two imagefibers with 10000 pixels and lightguide for illumination and objective lenses. This fiberscope for stereoscopic vision can be used for the microsurgery, such as the laparoscopic surgery and the thoracoscopic surgery required for the thin diameter.
Endoscope for stereoscopic vision is in great demand for medical field to diagnose and treat disease parts of patients more precisely. The authors are convinced that the silica based imagefiber is suitable for making a thinner fiberscope for stereoscopic vision. The structure of the fiberscope and the quality of transmitted image have been investigated. It has been found that stereognosis depends on the magnification of eyepiece, distance between left and right objective lenses and the image quality between two transmitting systems. On the basis of these results, the ultrathin fiberscope with silica based imagefibers for stereoscopic vision have been developed. The diameter of fiberscope is only 2 mm with two transmitting systems that consist of two imagefibers with 10000 pixels and lightguide for illumination and objective lenses. This fiberscope for stereoscopic vision can be used for the micro surgery, such as the laparoscopic surgery and the thoracoscopic surgery required for the thin diameter.
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