公开(公告)号：FR2690005A1

公开(公告)日：1993-10-15

申请号：FR9204430

申请日：1992-04-10

Applicant: COMMISSARIAT ENERGIE ATOMIQUE

Inventor： ENGIN MOLVA ,  ROGER ACCOMO

IPC: H01J1/304 ,  H01S3/0959 ,  H01S5/00 ,  H01S5/04 ,  H01J1/30 ,  H01J3/02 ,  H01J3/26 ,  H01S3/18

Abstract: An electron gun comprising a source (2) with electron-emitting micro-points, an anode (8) spaced apart from the micro-points, a device (16) for applying a high voltage to the anode, and a set (10) of electrodes distributed around the beam from the source to strip focus the beam onto the anode, and acting as an electrostatic shield for shielding the source from the high voltage, said set of electrodes being arranged between the source and the anode and comprising two or more different-sized pairs of electrodes (18a, 18b, 20a, 20b) at positive and negative voltages respectively, their value being such that a weak electrostatic field is generated between the source and the set of electrodes while a strong electrostatic field is generated between the set of electrodes and the anode. The gun further comprises a device for applying medium voltage to the set of electrodes, and a device for applying a suitable voltage to the micro-points.

公开(公告)号：FR2690286A1

公开(公告)日：1993-10-22

申请号：FR9204791

申请日：1992-04-17

Applicant: COMMISSARIAT ENERGIE ATOMIQUE

Inventor： ENGIN MOLVA ,  ROGER ACCOMO ,  GUY FEUILLET ,  JOEL CIBERT ,  DANG LE SI ,  CLAIRE BODIN-DESHAYES

IPC: H01S5/00 ,  H01S3/0959 ,  H01S5/02 ,  H01S5/024 ,  H01S5/04 ,  H01S5/042 ,  H01S5/32 ,  H01S5/34 ,  H01S5/343 ,  H01S5/347 ,  H01S3/091

Abstract: Semi-conducting heterostructural dissymmetric laser cavity and laser equipped with this cavity. This laser cavity includes a first region (1) of composition varying from a first to a second face with a gap energy which decreases linearly from the first to the second face, for electron excitation, the creation of electron/hole pairs and an optical confinement for guiding light, a quantum well active emission region (2), a second region (3) of optical confinement for guiding light and of composition varying from a first to a second face with a gap energy which increases from the first to the second face, the active region being in contact with the first and second faces respectively of the third and first regions, a buffer region interposed between the second region and a substrate, the first and second regions being dissymmetric with respect to the active region and defining with the latter a dissymmetric GRINSCH.