Patent ID: 8073020
Filing Date: 2011-12-06
Classification: G02B,H01S

Abstract:
1. A wavelength tuning apparatus, comprising: a light source unit having a predetermined wavelength band; a transmission-type diffraction unit diffracting a light provided from the light source unit at an angle according to a grid arrangement angle; a mirror which is disposed to be adjacent to the transmission-type diffraction unit so that a light that passes at a highest efficiency diffraction angle obtained by using an angle of light incident on the transmission-type diffraction unit and the grid arrangement angle passes through a target light path; a combining unit combining the transmission-type diffraction unit with the mirror as a single structure; and a driving unit rotating the combining unit according to a selected wavelength, wherein the light source unit includes a plurality of light sources having different wavelength bands and a light source selecting unit for mechanically selecting one from among the light sources, and the light source selecting unit includes an arrangement unit in which a plurality of the light sources are sequentially arranged and a driving unit which mechanically operates the arrangement unit so as to align a desired light source with a position for providing a light to the transmission-type diffraction unit.