Abstract
SUMMARYMid‐infrared lasers having the wavelength of the vicinity of 3 μm are considered as effective for the treatment of biomedical tissue because of the strong absorption to water. The drawback of 3 μm laser is the difficulty to propagate the silica optical fiber. We have reported the optical fiber tip oscillation laser that has a Er,Cr:YAGG laser crystal and coupling lenses on the tip of a silica fiber outputs 2.8 μm laser pumped by laser diode. In this paper, we demonstrated a lens‐less laser head for the optical fiber tip oscillation. By using the silica optical fiber having a core diameter of 105 μm and a numerical aperture of 0.12, the average output power of 1.0 W was achieved from the lens‐less laser head during a squire wave modulation for suppressing heat generation.
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