EP0678218B1 - Méthode pour visualiser le profil d'intensité d'une impulsion laser - Google Patents
Méthode pour visualiser le profil d'intensité d'une impulsion laser Download PDFInfo
- Publication number
- EP0678218B1 EP0678218B1 EP92902925A EP92902925A EP0678218B1 EP 0678218 B1 EP0678218 B1 EP 0678218B1 EP 92902925 A EP92902925 A EP 92902925A EP 92902925 A EP92902925 A EP 92902925A EP 0678218 B1 EP0678218 B1 EP 0678218B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulse
- laser pulse
- photocathode
- laser
- intensity profile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
- H01J31/501—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output with an electrostatic electron optic system
- H01J31/502—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output with an electrostatic electron optic system with means to interrupt the beam, e.g. shutter for high speed photography
Definitions
- the invention relates to a method for viewing the profile intensity of an ultra-short laser pulse.
- a streak camera which comprises in a vacuum enclosure a photocathode, an extraction grid, focusing electrodes, deflection plates and a display screen.
- the laser pulse to be analyzed is applied through a transparent substrate of the photocathode, which, in response, emits electrons. These are then subjected to the electric field applied between the cathode and the extraction grid. They are accelerated, pass through a hole in a focusing anode and are finally deflected by deflection plates, which receive a sawtooth tension. On the screen, one can then visualize the temporal distribution of the photons of the laser pulse which strike the photocathode.
- a photocathode of the semiconductor type which is illuminated by of light and which emits electrons in response is described in document US-A-4,868,380.
- document EP-A-0 127 735 describes a photodetector in form of a plurality of metal needles which receives the light and produces a cathode current.
- the object of the invention is to propose a method for analyzing pulses of duration less than 10 -10 sec, that is to say having a temporal response of one picosecond and even less.
- Figure 1 shows schematically and in axial section a "streak" camera for the implementation of the method according to the invention.
- Figure 2 shows a variant of the visible photocathode in figure 1.
- an enclosure 1 which is capable of being evacuated by about 1.3 • 10 -6 Pa (10 -8 Torr) and which comprises, centered on an axis 2, a metal needle 3, an extraction grid 4, a focusing anode 5 having a central hole, deflection plates 6 and finally a display screen 7, made of phosphorus, for example.
- the various organs are connected to sources of electrical voltage suitable for performing their respective conventional functions.
- the needle 3 is connected to a generator 8 of an electrical pulse which is synchronized with the optical pulse to be analyzed. The latter comes from a laser 9 placed outside the enclosure 1 and directing its beam 13 through a window 10 towards an area located opposite the needle 3.
- the amplitude of the electrical pulse supplied by the generator 8 is chosen slightly below a threshold at which spontaneous emission of electrons from the needle occurs.
- This emission is finally obtained only by the simultaneous application of this electrical pulse and the optical beam coming from the laser 9, the emission of electrons then corresponding fairly faithfully to the time profile of the optical pulse.
- the direct realization, from a laser alone, of an electric field, of an intensity such that it produces a tunnel effect and an emission of electrons, would require significant powers of the order of 1.3.10 11 W / cm 2 while the combined action of the electrical pulse and the optical pulse means that an optical power of the beam of the order of 10 5 W / cm 2 is sufficient to trigger the tunnel effect.
- the invention therefore makes it possible to reduce the power of the laser beam to be analyzed and therefore to improve the temporal resolution of the analysis.
- FIG. 2 represents a variant with respect to the needle 3 of FIG. 1.
- a substrate 11 made of a good conductive metal which is connected as before to the generator 8 through the wall of the enclosure 1.
- the invention is not limited to the embodiment described above.
- the beam laser intersects axis 2 at 90 °.
- an angle of 45 ° with the rough emission surface we obtains a pulse field emission accompanied by a photo broadcast.
Landscapes
- Electron Sources, Ion Sources (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
- Lasers (AREA)
Description
Claims (2)
- Méthode pour visualiser le profile d'intensité d'une impulsion laser ultrabrève, ladite méthode utilisant une caméra comportant dans une enceinte sous vide une photocathode avec au moins une pointe métallique, une grille d'extraction, des électrodes de focalisation, des plaques de déflexion et un écran de visualisation caractérisée par le fait que cette impulsion est dirigée vers l'intérieur, de la caméra, en ce que le faisceau laser traverse une zone en face de cette pointe, et qu'une impulsion électrique est appliquée à la grille d'extraction en synchronisme avec ladite impulsion laser, l'amplitude de cette impulsion électrique étant choisie légèrement inférieure à celle nécessaire pour causer toute seule une émission spontanée d'électrons de la photocathode.
- Méthode selon la revendication 1, caractérisée en ce que l'impulsion électrique définit une fenêtre temporelle autour de l'impulsion laser à visualiser.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU87882 | 1991-01-30 | ||
LU87882A LU87882A1 (fr) | 1991-01-30 | 1991-01-30 | Camera ultrarapide pour visualiser le profil d'intensite d'une impulsion laser |
PCT/EP1992/000165 WO1992014257A1 (fr) | 1991-01-30 | 1992-01-27 | Camera ultrarapide pour visualiser le profil d'intensite d'une impulsion laser |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0678218A1 EP0678218A1 (fr) | 1995-10-25 |
EP0678218B1 true EP0678218B1 (fr) | 1999-09-29 |
Family
ID=19731274
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92101273A Pending EP0497244A1 (fr) | 1991-01-30 | 1992-01-27 | Caméra ultrarapide pour visualiser le profil d'intensité d'une impulsion laser |
EP92902925A Expired - Lifetime EP0678218B1 (fr) | 1991-01-30 | 1992-01-27 | Méthode pour visualiser le profil d'intensité d'une impulsion laser |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92101273A Pending EP0497244A1 (fr) | 1991-01-30 | 1992-01-27 | Caméra ultrarapide pour visualiser le profil d'intensité d'une impulsion laser |
Country Status (9)
Country | Link |
---|---|
US (1) | US5362959A (fr) |
EP (2) | EP0497244A1 (fr) |
JP (1) | JPH06504649A (fr) |
AT (1) | ATE185220T1 (fr) |
CA (1) | CA2100266C (fr) |
DE (1) | DE69230075T2 (fr) |
IE (1) | IE920295A1 (fr) |
LU (1) | LU87882A1 (fr) |
WO (1) | WO1992014257A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0944621A (ja) * | 1995-07-25 | 1997-02-14 | Yokohama Rubber Co Ltd:The | 情報記憶素子及びスキャナ並びに情報記憶再生装置 |
US7721948B1 (en) * | 1999-05-25 | 2010-05-25 | Silverbrook Research Pty Ltd | Method and system for online payments |
RU2704330C1 (ru) * | 2018-11-30 | 2019-10-28 | Федеральное государственное бюджетное учреждение науки Институт спектроскопии Российской академии наук (ИСАН) | Фотоэмиссионный профилометр лазерного луча |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3316027A1 (de) * | 1983-05-03 | 1984-11-08 | Dornier System Gmbh, 7990 Friedrichshafen | Photodetektor |
US4868380A (en) * | 1988-03-02 | 1989-09-19 | Tektronix, Inc. | Optical waveguide photocathode |
US5013902A (en) * | 1989-08-18 | 1991-05-07 | Allard Edward F | Microdischarge image converter |
FR2662036B1 (fr) * | 1990-05-14 | 1993-06-25 | Centre Nat Rech Scient | Camera a balayage de fente. |
JP3071809B2 (ja) * | 1990-09-07 | 2000-07-31 | 浜松ホトニクス株式会社 | ストリーク管 |
-
1991
- 1991-01-30 LU LU87882A patent/LU87882A1/fr unknown
-
1992
- 1992-01-27 JP JP4503031A patent/JPH06504649A/ja active Pending
- 1992-01-27 DE DE69230075T patent/DE69230075T2/de not_active Expired - Fee Related
- 1992-01-27 CA CA002100266A patent/CA2100266C/fr not_active Expired - Fee Related
- 1992-01-27 WO PCT/EP1992/000165 patent/WO1992014257A1/fr active IP Right Grant
- 1992-01-27 AT AT92902925T patent/ATE185220T1/de not_active IP Right Cessation
- 1992-01-27 EP EP92101273A patent/EP0497244A1/fr active Pending
- 1992-01-27 EP EP92902925A patent/EP0678218B1/fr not_active Expired - Lifetime
- 1992-01-29 IE IE029592A patent/IE920295A1/en not_active IP Right Cessation
-
1993
- 1993-07-28 US US08/094,061 patent/US5362959A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5362959A (en) | 1994-11-08 |
ATE185220T1 (de) | 1999-10-15 |
IE920295A1 (en) | 1992-07-29 |
EP0497244A1 (fr) | 1992-08-05 |
JPH06504649A (ja) | 1994-05-26 |
WO1992014257A1 (fr) | 1992-08-20 |
CA2100266C (fr) | 2002-05-14 |
DE69230075T2 (de) | 2000-01-05 |
CA2100266A1 (fr) | 1992-07-31 |
LU87882A1 (fr) | 1992-10-15 |
DE69230075D1 (de) | 1999-11-04 |
EP0678218A1 (fr) | 1995-10-25 |
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