公开(公告)号：US3333140A

公开(公告)日：1967-07-25

申请号：US29806563

申请日：1963-07-29

Applicant: TEXAS INSTRUMENTS INC

Inventor： CHAPMAN RICHARD A

IPC: H01J45/00

CPC classification number: H01J45/00 ,  Y10T428/2944 ,  Y10T428/2949

公开(公告)号：US3402074A

公开(公告)日：1968-09-17

申请号：US35388764

申请日：1964-03-23

Applicant: TEXAS INSTRUMENTS INC

Inventor： CHAPMAN RICHARD A ,  CONNELLY JR JOHN J

IPC: H01J45/00

CPC classification number: H01J45/00 ,  Y10T428/12493 ,  Y10T428/12674 ,  Y10T428/12944

公开(公告)号：US3560873A

公开(公告)日：1971-02-02

申请号：US3560873D

申请日：1967-07-05

Applicant: TEXAS INSTRUMENTS INC

Inventor： CHAPMAN RICHARD A

IPC: H01S5/024 ,  H01S5/30 ,  H01S3/18

CPC classification number: H01S5/02423 ,  H01S5/02208 ,  H01S5/30

Abstract: A MERCURY-DOPED GERMANIUM SAMPLE IS MOUNTED IN CLOSE THERMAL CONTACT WITH THE BOTTOM OF A LIQUID HELIUM FILLED DEWAR. INFRARED TRANSMITTING WINDOWS SUCH AS POTASSIUM BROMIDE ARE PROVIDED IN THE DEWAR TO PERMIT PUMPING AND LASING RADIATION TO PASS INTO AND OUT OF SAID DEWAR. THE MERCURY-DOPED GERMANIUM HAS A SPLIT GROUND STATE WITH THE UPPER SPLIT OFF STATE BEING DEPOPULATED BY COOLING THE SAMPLE TO ABOUT 5*K. A POPULATION INVERSION BETWEEN THE SPLIT OFF GROUND STATE AND THE EFFECTIVE MASS EXCITED STATES OF THE MERCURY-DOPED GERMANIUM SAMPLE CAN BE OBTAINED BY INFRARED PUMPING USING A CO2 LASER BEAM WHICH HAS A WAVELENGTH OF ABOUT 10.6 MICRONS AND PHOTON ENERGIES OF 117 MILLIELECTRON VOLTS. SINCE GROUND STATES BINDING ENERGY OF THE MERCURY IMPURITY IS ABOUT 91.5 MILLIELECTRON VOLTS, THERMAL HEATING OF THE SAMPLE IS MINIMIZED BY USING A CO2 LASER SINCE THE EXCESS KINETIC ENERGY OF THE PHOTO-GENERATED CARRIER ID ON THE ORDER OF 26 MILLIELECTRON VOLTS.

公开(公告)号：US3400015A

公开(公告)日：1968-09-03

申请号：US26717963

申请日：1963-03-22

Applicant: TEXAS INSTRUMENTS INC

Inventor： CHAPMAN RICHARD A

IPC: H01J45/00

CPC classification number: H01J45/00 ,  Y10T428/12681 ,  Y10T428/12944