| 摘要 |
PURPOSE:To improve isolation by arranging the first taper glass and the second taper glass having prescribed vertical angles in the front of the first polarizing prism and reflected totally reflecting totally ordinary rays as well as extraordi nary rays in the reverse direction by taper glasses. CONSTITUTION:When the exit light of a semiconductor laser 5, namely, the light in the forward direction is made incident on the first taper glass 10 at a prescribed incidence angle, the light is refracted on an incidence surface 20a and is transmitted and is refracted on an exit surface 20b and passes a medium 8 and is made incident on the second taper glass 6. The light incident on the second taper glass 6 is refracted on an incidence surface 21a and is transmitted and is made incident on the first polarizing prism 1. Since the optical axis of the second polarizing prism 2 is inclined at 45 deg. to the first polarizing prism 1, the light is made incident on the second polarizing prism as ordinary rays o1. Consequently, the light is refracted in the second polarizing prism 2 with a refraction index of ordinary rays and is made incident on a taper glass 7. Extraordinary rays (e) has the plane of polarization rotated at 45 deg. by a Farady rotator 3 and are made incident on the second polarizing prism 2 as extraordinary rays e1. |
