Abstract:
An optical device may include: a first beam shaping unit configured to transform a first laser beam incident thereon into a second laser beam having an annular cross section; and a first focusing optical element for focusing the second laser beam in a first predetermined location so as to generate a Bessel beam.
Abstract:
An apparatus uses first and second laser beams from a laser apparatus to generate extreme ultraviolet light. The apparatus may include a chamber provided with at least one inlet through which at least one of first and second laser beams outputted from the laser apparatus travels into the chamber. A beam shaping unit is provided on a beam path of the first laser beam for transforming the first laser beam into a hollow laser beam. A first focusing optical element is provided downstream of the beam shaping unit for focusing the hollow laser beam in a first location inside the chamber.
Abstract:
A laser apparatus may include a master oscillator (310) configured to output a laser beam, at least one amplifier (320) provided in a beam path of the laser beam, at least one saturable absorber gas cell (330) provided downstream from the at least one amplifier (320) and configured to contain a saturable absorber gas for absorbing a part of the laser beam, the part of the laser beam having a beam intensity equal to or lower than a predetermined beam intensity, a fan (3304) provided in the saturable absorber gas cell and configured to cause the saturable absorber gas to circulate, and a heat exchanger (3305) provided in the saturable absorber gas cell and configured to cool the saturable absorber gas (3307).
Abstract:
An apparatus for generating extreme ultraviolet light may include a reference member (9), a chamber (2) fixed to the reference member, the chamber including at least one window (38), a laser beam introduction optical system (50) configured to introduce an externally supplied laser beam into the chamber through the at least one window, and a positioning mechanism (10) configured to position the laser beam introduction optical system to the reference member.
Abstract:
A Faraday rotator (100A) may include a magnetic field forming section (101,102) configured to form a magnetic field at a predetermined magnetic flux density in a predetermined region, a Faraday element (110) disposed in the predetermined region, and a first heat exhaust member (111), disposed on the side of one primary plane of the Faraday element, configured to form an optical contact surface with the Faraday element and configured to allow light (L12) at a predetermined wavelength to pass.
Abstract:
A laser apparatus may include a master oscillator, an optical unit provided in a beam path of a laser beam from the master oscillator, a beam adjusting unit provided upstream from the optical unit in a beam path of the laser beam and configured for adjusting at least one of a beam path and a wavefront of the laser beam, a first detection unit provided between the beam adjusting unit and the optical unit in a beam path of the laser beam and configured for detecting the laser beam, a second detection unit provided downstream from the optical unit in a beam path of the laser beam and configured for detecting the laser beam, and a controller configured for controlling the beam adjusting unit based on outputs from the first and second detection units.
Abstract:
A laser apparatus may include a master oscillator (310) configured to output a laser beam, at least one amplifier (320) provided in a beam path of the laser beam, at least one saturable absorber gas cell (330) provided downstream from the at least one amplifier (321) and configured to contain a saturable absorber gas for absorbing a part of the laser beam, the part having a beam intensity equal to or lower than a predetermined beam intensity, and a cooling unit (3304,3305) for cooling the saturable absorber gas. The saturable absorber gas cell (330) includes a chamber (3301) filled with saturable absorber gas (3308) and delimited by input/output windows (3302,3303). Furthermore, the chamber comprises a pair of cooling plates (3304,3305). The cooling plates have flow channels (3306,3307) for water cooling.
Abstract:
A cooling water temperature controlling device includes a heat exchanger for heat- exchanging between primary cooling water and secondary cooling water, a tank for storing the secondary cooling water, an injection pipe connecting the tank and a secondary cooling water supply unit, a valve for controlling a flow rate of the secondary cooling water from the secondary cooling water supply unit to the tank, a fluid level detection unit for detecting a level of the secondary cooling water in the tank, a first circulation pipe connecting the tank and the heat exchanger, a second circulation pipe connecting the heat exchanger and a temperature-control target, a third circulation pipe connecting the tank and the temperature- control target, a pump for circulating the secondary cooling water through the first to third circulation pipes, and a controller for controlling the valve and the pump based on the detected fluid level.