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    1.
    发明专利
    未知

    公开(公告)号：DE1298218B

    公开(公告)日：1969-06-26

    申请号：DEJ0028448

    申请日：1965-06-26

    Applicant: IBM

    Inventor： MAX ,  ERHARD DR ,  M KOSANKE KURT ,  FALLS WAPPINGERS ,  KULCKE ,  W DR WERNER

    IPC: G02F1/09 ,  H01S3/105 ,  H01S3/10

    Abstract: 1,053,086. Lasers. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 21, 1965 [June 29. 1964], No. 21755/65. Heading H1C. A laser has its optical cavity formed by mirrors 11, 12 of magnetic material one of which is partially transmitting, the mirrors being controllably magnetized so that the Kerr magneto optical effect causes an output ray circularly polarized in a selected direction to be obtained. The active medium may be dysprosium-doped calcium fluoride which radiates circularly polarized light when pumped and subjected to a magnetic field, or may be another medium the radiation of which is circularly polarized by quarter wave plates 14, 15. When the magnetic field applied to a mirror 11, 12 is in the same direction as the incident radiation, Fig. 1 (not shown), the reflected light becomes more strongly polarized in the right-hand sense. The converse applies when the direction of the magnetic field is reversed, Fig. 2 (not shown). The laser may be arranged so that the threshold for laser action is only exceeded if both mirrors produce circular polarization in the same sense. Then by reversing the magnetization of both mirrors the direction of circular polarization of the output light is reversed. Other relationships of magnetic directions in association with an optical cavity of higher Q can be used. In a modification one mirror is formed of a dielectric material having a constant reflectivity irrespective of the polarization direction. An output is then obtained which is circularly polarized in one direction or the other in accordance with the magnetization direction of the single mirror. By controlling the magnetization of the mirrors a modulated output may be obtained.

    2.
    发明专利
    未知

    公开(公告)号：DE1284536B

    公开(公告)日：1968-12-05

    申请号：DEJ0027480

    申请日：1965-02-09

    Applicant: IBM

    Inventor： MAX ,  ERHARD DIPL-PHYS ,  TE-FU CHANG PAUL

    IPC: G11C13/06 ,  H01S3/102 ,  G02B5/30

    Abstract: 1,038,329. Lasers. INTERNATIONAL BUSINESS MACHINES CORPORATION. Feb. 11, 1965 [Feb. 28, 1964], No. 5905/65. Heading H3B. In order to produce a beam of polarized light from a laser a magnetic plate is inserted in the optical cavity to reflect light between one of the cavity reflectors and the active medium so that when the surface of the plate is magnetized the light is elliptically polarized when reflected due to magneto-optic effects. In the arrangement shown a magnetic plate 3 is inserted in the optical cavity 2, 6 of a ruby laser 1 so that when the plate 3 is magnetized in a direction parallel to the plane of incidence of the light from rod 1 and in the surface 4 then after a number of reflections the light becomes fully elliptically polarized in a direction depending on the direction of magnetization, Fig. 3 (not shown). In order to compensate for the effect of metallic reflections on the polarization of the light produced mirror 8 is inserted in the light path between plate 3 and mirror 6 arranged in a plane normal to the surface 4 and at an angle of 45 degrees to the plane of incidence of light acting on surface 4. The surface 4 may have different areas magnetized in different directions, Fig. 8 (not shown), so that the output beam has portions corresponding to the areas polarized in one direction or the other.

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