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    Laser infrared image converter
    1.
    发明授权
    Laser infrared image converter 失效
    激光红外图像转换器

    公开(公告)号：US3588508A

    公开(公告)日：1971-06-28

    申请号：US3588508D

    申请日：1968-09-30

    Applicant: IBM

    Inventor： WIEDER HAROLD

    IPC: H01S3/10 ,  G02F1/03 ,  G02F1/05 ,  H01S3/00 ,  H01S3/06 ,  H01S3/08

    CPC classification number: H01S3/0064 ,  H01S3/0602 ,  H01S3/08

    Abstract: A DEVICE FOR CONVETING INFRARED IMAGES INTO VISIBLE IMAGES IS DESCRIBED WHICH EMPLOYS LASER TECHNOLOGY. THE INFRARED IMAGE, IF NECESSARY, IS FIRST AMPLIFIED BY PASSING IT THROUGH AN ACTIVE LASER MEDIUM WITH INVERTED POPULATION. IMAGE FORMING LENSES AND FIELD LENSE MAY BE PROVIDED IN THE AMPLIFICATION STAGE TO PRESERVE THE IMAGE. IF THE INFRARED IMAGE HAS SUFFICIENT POWER, AMPLIFICATION MAY NOT BR REQUIRED. THE IMAGE IS THEN TRANSMITTED INTO A MULTIMODE DEGENERATE LASER CAVITY. THE LASER CAVITY CONSISTS OF AN ACTIVE MEDIUM DISPOSED BETWEEN TWO END MIRRORS. THE LASER CAVITY IS OF THE TYPE HAVING AN UPPER LEVEL WHICH IS A COMMON LEVEL FOR LASER TRANSITIONS TO TWO LEVELS, ONE TRANSITION OCCURRING IN THE INFRARED RANGE AND ONE IN THE VISIBLE RANGE. THE TWO END MIRRORS OF THE CAVITY ARE HIGHLY REFLECTIVE FOR THE VISIBLE MODE AND HIGHLY TRANSMISSIVE FOR THE INFRARED MODE SO THAT THE LASER OPERATES IN THE VISIBLE MODE. THE ACTIVE MEDIUM IN THE LASER CAVITY IS THRESHOLDED SUCH THAT WHEN THE INFRARED IMAGE IS TRANSMITTED INTO THE CAVITY, THE LIGHT PATH MODES CARRYING THE INFRARED LIGHT WILL BE DEPOPULATED AND WILL "TURN OFF" WHERE THE INFRARED IMAGE IS MOST INTENSE. THOSE LIGHT MODES WHERE THE INFRARED IMAGE IS NOT PRESENT WILL CONTINUE TO LASE MOST INTENSELY IN THE VISIBLE AND A COMPLEMENT OR NEGATIVE OF THE INFRARED IMAGE WILL BE PRODUCED, WITH THE RESULT THAT A VISIBLE IMAGE CAN BE COUPLED OUT OF THE CAVITY WHICH HAS VISIBLE LIGHT IN THOSE REGIONS WHERE THE INFRARED OF THE IMAGE WS NOT PRESENT.

    OPTICAL RECORDING MEDIUM
    4.
    发明专利
    OPTICAL RECORDING MEDIUM 未知

    公开(公告)号：CA1250176A

    公开(公告)日：1989-02-21

    申请号：CA426780

    申请日：1983-04-27

    Applicant: IBM

    Inventor： LEE MICHAEL H ,  ONTON AARE ,  WIEDER HAROLD

    IPC: B41M5/26 ,  G01D15/34 ,  G11B7/243 ,  G11B7/24

    Abstract: OPTICAL RECORDING MEDIUM An optical recording medium comprising adjacent thin layers of two different materials, which, upon marking with an energy beam, form a marked area comprising an alloy or mixture of the two materials. The optical properties of the marked area has contrast sufficiently different from the optical properties of the unmarked area so that the marked area can be reliably sensed. One of the first of the thin layers comprises a metal and the other of the thin layers comprises a metal or a semiconductor. The metals are taken from the group comprising Al, Au, Pb and Sn and the semiconductors are chosen from the group comprising Ge and Si.

    5.
    发明专利
    未知

    公开(公告)号：DE2415625A1

    公开(公告)日：1974-10-17

    申请号：DE2415625

    申请日：1974-03-30

    Applicant: IBM

    Inventor： WIEDER HAROLD

    IPC: G02B27/00 ,  G11B7/13 ,  G11C13/04 ,  H01S3/09

    Abstract: 1417374 Data storage INTERNATIONAL BUSINESS MACHINES CORP 14 March 1974 [9 April 1973] 11370/74 Heading G4C [Also in Division H1] Information is stored in a film medium 4, Fig. 1, as a pattern of low and high reflectivity areas 5, 6, 7, and is read out optically by sequential area scanning with a beam from a laser 1, the high reflectivity areas being detected by a change in the operational characteristics of the laser caused by the high intensity of the reflected beam incident on its adjacent resonator mirror R2. The storage medium 4 is an amorphous semi-conductor and may consist of a Te 0.93 - G 0.02 As 0.5 film. In the arrangement shown the laser 1 is a GaAs, GaAlAs or InAs homojunction or heterojunction having its output beam focused on a storage area by lenses 2, 3. The change of operational characteristics is obtained by adjusting the laser pumping power to a value such that it operates below the lasing threshold when directed to a low reflectivity area, but is switched to a lasing state when increased radiation is reflected back to mirror R 2 from a high reflectivity area. A detector, e.g. a PIN diode formed integrally with the laser, identifies the information stored by determining the laser operating state. In an alternative arrangement, Fig. 4, a He-Ne or Hg laser is operationally switched between low and high gain operation, producing infra-red and visible outputs respectively, depending on the reflectivity of the storage area interrogated. To establish this condition the laser must inherently have two competing transitions sharing a common energy level and of distinctly different energy and gain. In the absence of a high reflectivity area 56 in the output beam path, the laser operates in the low gain, infra-red state due to a dichroic resonator mirror 52 which is of low reflectivity at the visible wavelength and of moderate reflectivity in the infra-red, the other mirror 51 being highly reflective. The presence of a high reflectivity area causes the laser to switch to the different wavelength higher gain visible state, the operating state being identified by a frequency detector 59.

    6.
    发明专利
    未知

    公开(公告)号：DE1547386A1

    公开(公告)日：1969-12-04

    申请号：DE1547386

    申请日：1967-03-25

    Applicant: IBM

    Inventor： VLADIMIR POLE ROBERT ,  WIEDER HAROLD ,  ANTHONY MYERS ROBERT

    IPC: G02B27/50 ,  G03H1/00 ,  H01S3/106 ,  H04N5/74 ,  G02B27/00

    Abstract: 1,111,027. Lasers. INTERNATIONAL BUSINESS MACHINES CORPORATION. March, 1967 [24 March, 1966], No. 9621/67. Heading H1C. [Also in Division G2] A phase modulating object 14 such as a hologram is either located within or forms part of a laser resonator, the off-axis radiation 18, 18a, 18b, 20, 20a, 20b produced by the object being projected on to an external viewing screen 34 after passing outside the extremities of a resonator mirror M1. As shown a transparent object formed with a modulated sinusoidal ripple surface 16 is contained within a resonator formed by mirrors M1, M2. The object alternatively may be of uniform thickness and have a non-uniform index of refraction. As the emission from the laser active medium 10 is focussed by lenses L1, L2 on to respective resonator mirrors, the axial modes such as the zero order modes due to the carrier sinusoidal ripple are contained within the resonator. Higher order off-axis modes due to the carrier and its modulation produce output beams focussed, for example, on points 22, 24. Since these points are outside the dimensional limits of small mirror M1 the beams are projected on to the viewing screen by a lens L3. A still smaller mirror M1 is used if the object 14 has no sinusoidal carrier ripple. Lens L1 may be omitted by using a larger mirror M1 spaced further from the object. In a modification the rippled surface of the object may be silvered and replace resonator mirror M2, in which case lens L2 is also omitted.

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