Processing

Please wait...

Settings

Settings

Goto Application

1. WO1995034927 - LASER GAS CONTROLLER AND CHARGING-DISCHARGING DEVICE FOR DISCHARGE-EXCITED LASER

Publication Number WO/1995/034927
Publication Date 21.12.1995
International Application No. PCT/JP1995/001015
International Filing Date 26.05.1995
Chapter 2 Demand Filed 13.10.1995
IPC
H01S 3/036 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
02Constructional details
03of gas laser discharge tubes
036Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering or replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube
H01S 3/134 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
131by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
134in gas lasers
CPC
H01S 3/036
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
02Constructional details
03of gas laser discharge tubes
036Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube
H01S 3/134
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
131by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
134in gas lasers
Applicants
  • KOMATSU LTD. [JP]/[JP] (AllExceptUS)
  • MIZOGUCHI, Hakaru [JP]/[JP] (UsOnly)
  • NISHISAKA, Toshihiro [JP]/[JP] (UsOnly)
  • KOMORI, Hiroshi [JP]/[JP] (UsOnly)
Inventors
  • MIZOGUCHI, Hakaru
  • NISHISAKA, Toshihiro
  • KOMORI, Hiroshi
Agents
  • KIMURA, Takahisa
Priority Data
6/13446816.06.1994JP
6/20227326.08.1994JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) LASER GAS CONTROLLER AND CHARGING-DISCHARGING DEVICE FOR DISCHARGE-EXCITED LASER
(FR) REGULATEUR DE GAZ LASER ET DISPOSITIF DE CHARGE-DECHARGE POUR LASER A DECHARGE
Abstract
(EN)
The main purpose of this invention is to stabilize the output power of a laser. In order to accomplish this purpose, the amount of the laser gas supplied to a laser chamber (4) is controlled while the voltage of a power source (17) is maintained at a fixed value or within a fixed range so that the output power (E) of the laser beam (La) can be a target value when the output power (E) is detected deviating from the target value. The second purpose of this invention is to prevent the drop of the output power (E) by reducing the consumption of preionizing electrode. This purpose is accomplished as follows. A secondary capacitor (C2) is charged with a pulse current discharged from a primary capacitor (C1) and boosted through a pulse transformer (20). When the capacitor (C2) is charged, a magnetic switch (SR) connected to the capacitor (C2) is saturated and conductive, and the current passes through the preionizing electrode (6) connected in series with the switch (SR). When the transfer of electric charge to the capacitor (C2) is completed, a reverse discharge current tends to flow to the capacitor (C2), but the switch (SR) blocks the reverse current and stops the preionizing discharge. Simultaneously, the magnetic core of the transformer (20) is saturated, and transfer of electric charge to a peaking capacitor (C4) from the capacitor (C2) is started. As a result, the voltage across the capacitor (C4) rises to a discharge start voltage, resulting in laser oscillation.
(FR)
L'objet principal de l'invention consiste à stabiliser la puissance rayonnée d'un laser. A cette fin, la quantité de gaz laser fournie à une chambre laser (4) est régulée pendant que la tension d'une source d'alimentation (17) est maintenue à une valeur fixe ou dans une plage fixe afin que la puissance rayonnée (E) du faisceau laser (La) puisse être ramenée à une valeur cible lorsque l'on constate que la puissance rayonnée (E) s'écarte de la valeur cible. Le deuxième objet de l'invention est d'empêcher la chute de la puissance rayonnée (E) par réduction de la consommation de l'électrode préionisante. Ce résultat est obtenu comme suit: un condensateur secondaire (C2) est chargé au moyen d'un courant pulsé provenant d'un condensateur primaire (C1) et relevé au moyen d'un transformateur d'impulsions (20). Lorsque le condensateur (C2) est chargé, un commutateur magnétique (SR) relié au condensateur (C2) est saturé et conducteur, et le courant passe à travers l'électrode préionisante (6) relié en série avec le commutateur (SR). Lorsque le transfert de la charge électrique vers le condensateur (C2) est terminé, un courant de décharge inverse a tendance à circuler en direction du condensateur (C2), mais le commutateur (SR) bloque le courant inverse et interrompt la décharge préionisante. Simultanément, le noyau magnétique du transformateur (20) est saturé et le transfert de la charge électrique du condensateur (C2) vers un condensateur de correction (C4) commence. Il en résulte une augmentation de la tension du condensateur (C4) jusqu'à la tension de d'amorçage de décharge, ce qui produit l'oscillation laser.
Also published as
Latest bibliographic data on file with the International Bureau