公开(公告)号：US3720784A

公开(公告)日：1973-03-13

申请号：US3720784D

申请日：1971-02-12

Applicant: BELL TELEPHONE LABOR INC

Inventor： MAYDAN D ,  COHEN M ,  KERWIN R

IPC: B23K26/08 ,  B41M5/24 ,  G03B15/00 ,  G03C9/00 ,  G09G3/00 ,  G11B7/241 ,  H04N1/23 ,  H04N5/76 ,  G11B7/00 ,  G11B11/02

CPC classification number: H04N5/76 ,  B23K26/0821 ,  B23K26/361 ,  B23K26/389 ,  B23K26/40 ,  B23K2203/42 ,  B23K2203/50 ,  G03B15/00 ,  G03C9/00 ,  G09G3/002 ,  G09G3/025 ,  G11B7/241 ,  G11B7/2535 ,  H04N1/23

Abstract: An image comprising a multitude of small discrete holes is formed by a laser in a radiation absorbing film. Appropriate means form a large number of brief-duration, amplitude-modulated pulses of optical radiation. These pulses are then deflected and focused to form an array of discrete holes in a film, such as a 500 Angstrom thick layer of bismuth, on a polyester substrate. By varying the energy in each pulse, the size of the holes can be varied to form images having a gray scale.

Abstract translation: 通过激光在辐射吸收膜中形成包括多个小离散孔的图像。 适当的手段形成了大量的短时间，幅度调制的光辐射脉冲。 然后这些脉冲被偏转和聚焦，以在聚酯基底上形成薄膜（例如500埃厚的铋层）中的离散孔阵列。 通过改变每个脉冲中的能量，可以改变孔的尺寸以形成具有灰度级的图像。

公开(公告)号：US3715685A

公开(公告)日：1973-02-06

申请号：US3715685D

申请日：1971-04-30

Applicant: BELL TELEPHONE LABOR INC

Inventor： GORDON E ,  MAYDAN D

IPC: H01S5/14 ,  H01S3/00

CPC classification number: H01S5/14

Abstract: The specification describes injection lasers employing heterosemiconductor structures for obtaining an enlarged crosssectional area cavity defined by an optical waveguide terminated by the cleaved faces of the semi-conductor structure (usually known as mirrors). The enlarged area of the cavity allows higher power output from the laser for the same power density on the mirrors. The power density is limited by damage to the mirrors. The waveguide produces an output consisting of two plane wave lobes for each mode. Techniques for mode enhancement are described from which higher ultimate power for a single mode and higher efficiency can e predicted without exciting modes of other order. Separation between the thresholds of competing modes can be enhanced, for example, by placing a spherical reflector in the path of one output lobe to focus the energy back into the original cavity while at the same time aperturing the mirror to block modes of other order. This expedient is based upon the uniqueness of the lobe angle for a given mode. Also described is a technique for combining the dual lobe output characteristic of this laser structure by using a beam splitter in reverse.