| 摘要 |
A phase retarder (10) and an optical comb filter (100) comprise a polarization beam splitter (11), a first air arm and a second air arm, wherein the polarization beam splitter (11) is used for splitting a light beam incoming from a first sidewall into a first light component transmitted along a first direction and a second light component transmitted along a second direction. The first direction is perpendicular to the second direction, and the polarization state of the first light component is perpendicular to that of the second light component. The first air arm is arranged on a second sidewall of the polarization beam splitter (11) and used for receiving the first light component and reflecting the first light component back to the polarization beam splitter; the second air arm is arranged on a third sidewall of the polarization beam splitter (11) and used for receiving the second light component and reflecting the second light component back to the polarization beam splitter (11), so as to form an interference light by interfering with the first light component and enable the interference light to be emitted from a fourth sidewall of the polarization beam splitter (11). |
