| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable the continuous change and high speed control of an optical phase, a less loss, a reduction in the number of components, a reduction in size, and a further reduction in cost through a decrease in expensive optical components. <P>SOLUTION: The variable optical phase unit includes: a polarizer 10 for polarizing and separating incident light into two straight polarizations orthogonal to each other in polarizing direction; a quarter wavelength plate 12 for converting the two straight polarizations of different optical paths into circular polarizations rotated in the same direction in polarization face; a variable Faraday rotor 14 for transmitting the two circular polarizations while rotating the respective polarization faces; a condensing lens 16 for changing the optical path directions of the two transmitted circular polarizations; and a reflecting mirror 18 for reflecting two circular polarizations. The reflecting mirror is set in the focusing position of the condensing lens such that the optical path of forward light traveling toward the reflecting mirror from the input side and the optical path of reflected backward light are replaced by a combination of the condensing lens and reflecting mirror. The phase of output light polarized and combined by the reverse advancement of the polarizer is changed according to a Faraday rotation angle of the variable Faraday rotor. <P>COPYRIGHT: (C)2012,JPO&INPIT |
