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    Multicolor laser frequency selector
    11.
    发明授权
    Multicolor laser frequency selector 失效
    多光子激光频率选择器

    公开(公告)号：US3605039A

    公开(公告)日：1971-09-14

    申请号：US3605039D

    申请日：1969-11-20

    Applicant: IBM

    Inventor： HARRIS THOMAS J ,  ERHARD MAX

    IPC: H01S3/082 ,  H01S3/107 ,  H01S3/10

    CPC classification number: H01S3/1075 ,  H01S3/0823

    Abstract: A laser cavity is formed by a partially transmissive output mirror and a plurality of reflecting mirrors. An ionized gas laser having Brewster angle windows is placed in the cavity. Spaced from one of the windows is a polarizing quartz crystal, the faces of which are coated with antireflective coatings. Adjacent to the quartz crystal is a right triangular birefringent prism having antireflecting coatings on two of its faces. The combined effect of the crystal and the prism is to disperse one laser wavelength along a path through an electro-optical crystal to a reflecting mirror. In addition, other laser wavelengths are transmitted to another quartz crystal and another birefringent crystal whose combined effect is to disperse a second laser wavelength along a path through an electrooptical crystal to another reflecting mirror. Other laser wavelengths are transmitted by the second birefringent crystal to another quartz crystal and birefringent crystal and from there additional respective electro-optical crystals and mirrors. When none of the electro-optical crystals is energized, the laser output beam will contain those wavelengths incident on the several mirrors. All other wavelengths capable of being generated by the laser are suppressed because of the losses introduced by the action of the quartz crystals and birefringent crystals. One or more of the several wavelengths may be removed from the laser beam by energizing the corresponding electro-optical crystal.

    Achromatic polarization rotator
    12.
    发明授权
    Achromatic polarization rotator 失效
    高精度偏振旋转器

    公开(公告)号：US3574441A

    公开(公告)日：1971-04-13

    申请号：US3574441D

    申请日：1968-11-22

    Applicant: IBM

    Inventor： HARRIS THOMAS J ,  MAX ERHARD

    IPC: G02F1/01 ,  G02F1/03 ,  G02F1/40

    CPC classification number: G02F1/0136 ,  G02F1/0322

    Abstract: Apparatus is provided for effecting controlled alterations in the polarization of a multiwavelength beam of radiation. Plural stress responsive elements are arranged in cascade to receive the radiation from a source; the elements being arranged in differing predetermined directions with respect to the polarization of the radiation. Dependent on the stress applied to the elements, the apparatus is tunable for bandwidth response. When stress is applied, the apparatus operates to provide a second state of operation.

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