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.

公开(公告)号：US3312519A

公开(公告)日：1967-04-04

申请号：US29151563

申请日：1963-06-28

Applicant: IBM

Inventor： ERHARD MAX

IPC: G02B5/18 ,  G02B27/28 ,  G02F1/01 ,  G02F1/29

CPC classification number: G02F1/29 ,  G02B5/1876 ,  G02B27/28 ,  G02F1/0131

公开(公告)号：US3396266A

公开(公告)日：1968-08-06

申请号：US36974164

申请日：1964-05-25

Applicant: IBM

Inventor： ERHARD MAX ,  SINCERBOX GLENN T

IPC: G02F1/00 ,  G02F1/31 ,  G11C13/04

CPC classification number: G11C13/04 ,  G02F1/00 ,  G02F1/31

公开(公告)号：US3391972A

公开(公告)日：1968-07-09

申请号：US39928564

申请日：1964-09-25

Applicant: IBM

Inventor： HARRIS THOMAS J ,  KULCKE WERNER W ,  ERHARD MAX

IPC: G02F1/31 ,  H03K17/78

CPC classification number: H03K17/78 ,  G02F1/31

公开(公告)号：US3292091A

公开(公告)日：1966-12-13

申请号：US43499865

申请日：1965-02-24

Applicant: IBM

Inventor： KOSANKE KURT M ,  KULCKE WERNER W ,  ERHARD MAX

IPC: G02F1/03 ,  G11C27/02 ,  H03K3/53 ,  H03K17/78

CPC classification number: G02F1/0327 ,  G11C27/024 ,  H03K3/53 ,  H03K17/78

Abstract: 1,089,408. Modulating light; pulse circuits. INTERNATIONAL BUSINESS MACHINES CORPORATION. Oct. 14, 1965 [Feb. 24, 1965], No. 43567/65. Headings H3P and H4F A circuit for charging and discharging a capacitive load, e.g. an electro-optic crystal 8, comprises a tank capacitor 12 connected through an inductance 10 to the unearthed crystal plate 9 so as to form an oscillating circuit. Diodes D1 and D2 which block the flow of current towards the inductance but permit current to flow in the opposite direction are connected at the ends of the inductance and are by-passed by switches S1 and S2 which are closed intermittently by pulses derived from the data pulses, as shown, so as to transfer electrostatic energy from the tank capacitor to the crystal plate and then to return electrostatic energy from the crystal plate to the tank capacitor. After each return of energy to the tank capacitor i.e. after switch S2 is opened, a voltage pulse is applied to the tank capacitor through diode D4 to compensate for any losses, e.g. resistance losses, occurring during the operation of the circuit, and at the same time to ensure that the crystal is completely discharged the voltage on conductor 14, which is connected through diode D3 to the crystal plate and is normally subjected to a voltage equal to the initial voltage to which the tank capacitor is originally charged, is reduced to zero. The voltages on conductors 14 and 16 are derived from clock pulses which arc differentiated 20, delayed 22 and applied to a monostable circuit 24. In order that a half wave voltage may exist on the crystal by the discharging of the tank capacitor it is necessary that the initial voltage be greater than the half wave voltage by an amount equal to the voltage remaining on the tank capacitor after discharging. When the half wave voltage is applied across crystal 8 the plane of polarization of the plane polarized light from source 4 is changed by 90 degrees and thus the light is deflected in birefringent element 6.