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:
A system (11A) for generating extreme ultraviolet light, in which a target material (27) inside a chamber (2A) is irradiated with a laser beam to be turned into plasma, includes a first laser apparatus (40) configured to output a first laser beam (41), a second laser apparatus (3A) configured to output a second laser beam having a pedestal and a peak portion, and a controller (5A)connected to the first and second laser apparatuses and configured to cause the first laser beam to be outputted first, the pedestal to be outputted after the first laser beam, and the peak portion having higher energy than the pedestal to be outputted after the pedestal.
Abstract:
A laser apparatus may include a seed laser device configured to output a pulse laser beam, a pulse energy adjusting unit configured to vary pulse energy of the pulse laser beam, at least one amplifier for amplifying the pulse laser beam, at least one power source for varying an excitation intensity in the at least one amplifier, and a controller configured to control the pulse energy adjusting unit on a pulse-to-pulse basis for the pulse laser beam passing therethrough and to control the at least one power source for a group of multiple pulses of the pulse laser beam.
Abstract:
A laser apparatus may include a seed laser device configured to output a pulse laser beam, a pulse energy adjusting unit configured to vary pulse energy of the pulse laser beam, at least one amplifier for amplifying the pulse laser beam, at least one power source for varying an excitation intensity in the at least one amplifier, and a controller configured to control the pulse energy adjusting unit on a pulse-to-pulse basis for the pulse laser beam passing therethrough and to control the at least one power source for a group of multiple pulses of the pulse laser beam.
Abstract:
A laser apparatus may include: a master oscillator configured to output a pulsed laser beam at a repetition rate; at least one amplifier disposed on a beam path of the pulsed laser beam; at least one optical shutter disposed on the beam path of the pulsed laser beam; and a controller configured to switch the at least one optical shutter.
Abstract:
An optical device may include: an optical module disposed in a beam delivery path of a laser beam; a beam adjusting unit disposed in the beam delivery path for adjusting the beam delivery path of the laser beam; a measuring unit disposed in the beam delivery path for detecting the beam delivery path; and a control unit for controlling the beam adjusting unit based on a detection result of the beam delivery path of the laser beam detected by the measuring unit.
Abstract:
An extreme ultraviolet light generation system used with a laser apparatus may be provided, and the extreme ultraviolet light generation system may include: a chamber including at least one window for at least one laser beam and a target supply unit for supplying a target material into the chamber; and at least one polarization control unit, provided on a laser beam path, for controlling a polarization state of the at least one laser beam.
Abstract:
A regenerative amplifier (20) according to one aspect of this disclosure is used in combination with a laser device, and the regenerative amplifier may include: a pair of resonator mirrors (21a, 21b) constituting an optical resonator; a C02 slab amplifier (25) provided between the pair of the resonator mirrors for amplifying a laser beam with a predetermined wavelength outputted from the laser device; and an optical system (26, 27) disposed to configure a multipass optical path (C2) along which the laser beam is reciprocated inside the slab amplifier, the optical system transferring an optical image of the laser beam at a first position (la) as an optical image of the laser beam at a second position (lb).
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:
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.