摘要:
The present invention provides an excimer laser capable of producing a high quality pulsed laser beam at pulse rates of about 4,000 Hz at pulse energies of about 5mJ or greater. A preferred embodiment is an ArF excimer laser specifically designed as a light source for integrated circuit lithography. An improved wavemeter (4K) with special software monitors output beam parameters and controls a very fast PZT driven tuning mirror, which is in a line narrowing module (15K) and the pulse power charging voltage to maintain wavelength and pulse energy within desired limits. In a preferred embodiment two fan motors (16K and 17K) drive a single tangential fan which provides sufficient gas flow to clear discharge debris from the the discharge region during the approximately 0.25 milliseconds between pulses.
摘要:
Feedback timing control equipment and process for an injection seeded modular gas discharge laser (11). A preferred embodiment is a system capable of producing high quality pulsed laser beams at pulse rates of about 4,000 Hz or greater and at pulse energies of about 5 to 10 mJ or greater for integrated outputs of about 20 to 40 Watts or greater. The feedback timing control is programmed to permit in some circumstances discharges timed so that no significant laser energy is output from the system. Use of this technique permits burst mode operation in which the first discharge of a burst is a no-output discharge so that timing parameters for each of the two chambers can be monitored before the first laser output pulse of the burst. Two separate discharge chambers are provided, one of which is a part of a master oscillator producing a very narrow band seed beam which is amplified in the second discharge chamber. The chambers can be controlled separately permitting optimization of wavelength parameters in the master oscillator and optimization of pulse energy parameters in the amplifying chamber.
摘要:
An einem frequenzangeregten Gaslaser (1) für die Materialbearbeitung liegt ein im wesentlichen außengekühlter Entladungsraum (7) zwischen zwei Anregungselektroden zur Energieeinkoppelung in Form zylindrischer Elektrodenrohre (2, 3), die mit einer Quelle (23) für elektrische Anregungsenergie über Halbleiterschaltelemente (22) zur Erzeugung der Anregungsfrequenz in Verbindung stehen und von denen wenigstens eines an seiner dem Entladungsraum (7) zugewandten Seite ein Dielektrikum (5, 6) aufweist.
摘要:
Disclosed is a gas laser utilizing radio frequency discharge excitation in the area of sonic or supersonic/subsonic transfer gas flow. The laser uses various types of gases and mixtures of gases as the active medium and provides for RF or UV pre-ionization of the gaseous medium before using radio frequency discharge excitation. The gas is supplied into a receiver (3a), and has downstream therefrom a supersonic nozzle (1) for acceleration of the active gaseous flow to high subsonic or supersonic speeds in order to provide intensive dynamic cooling of the active gas medium. The gas is excited using radio frequency discharge excitation in the critical area (1b) of the supersonic nozzle or downstream therefrom. The radio frequency discharge and excitation can also occur within the optical resonator region (23) which is located within the supersonic area of the nozzle. The present invention provides compact, efficient and super-powerful continuous, quasi-continuous and pulse laser systems with wavelengths from 2.03 mkm to 10.6 mkm with a high quality output beam. The present laser device may be utilized in scientific, commercial, aerospace and free space applications.
摘要:
This invention relates to an excimer laser oscillation apparatus which has a laser chamber (20) which stores a laser gas containing a gas mixture of at least one inert gas selected from the group consisting of Kr, Ar, and Ne, and F 2 gas, and in which an inner surface thereof has a reflection-free surface (3) with respect to light of a desired wavelength of 248 nm, 193 nm, or 157 nm, and the uppermost surface of the inner surface consists of a fluoride, an optical resonator which is made up of a pair of reflection mirrors (5,6) arranged to sandwich the laser chamber (20) therebetween, and in which the reflectance of the reflection mirror (6) on the output side is 90% or more and microwave introduction means (300,303,302), arranged on the laser chamber (20), for continuously exciting the laser gas in the laser chamber (20).
摘要:
The invention relates to a multi-channel RF-excited gas laser device which has an elongate tubular dielectric housing 1. The housing has a common elongate ground electrode 2 therewithin and a plurality of laser channels 4 defined within and extending along the ground electrode 2 adjacent to an interior surface 3 of the dielectric housing. A laser gas is provided within the dielectric housing and a plurality of RF electrodes 7 are disposed adjacent to and extending along an external surface 8 of the dielectric housing 1. Each RF electrode 7 is disposed in registration with one of the laser channels 4.
摘要:
A transverse RF pumped gas laser has a large area discharge which is of generally rectangular shape in all plan views. In cross-section the geometry of the discharge has a longer and a shorter dimension, the longer dimension being between the electrodes (12,30,32) to which RF power is supplied and the shorter dimension, suitable for guiding intracavity laser light, being defined by ceramic side walls (16,18).