Radiation pulse energy control system, lithographic apparatus and device manufacturing method
First Claim
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1. A radiation pulse energy control system configured to control energy in a pulse of radiation passing through the system, comprising:
- a radiation detector that is configured to monitor the energy in the pulse of radiation; and
an optical shutter that is configured to close in response to the radiation detector in order to trim part of the pulse of radiation passing through the system,wherein the radiation detector is configured such that a speed of response of the radiation detector equals a speed of response of the optical shutter.
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Abstract
A system for controlling the energy of radiation pulses. A detector monitors energy of the pulses and an optical shutter trims the radiation pulses after a suitable optical delay line. The accuracy of the control of the energy of the radiation pulses can be improved by matching a rate of response of the radiation detector to a rate of response of the optical shutter.
21 Citations
11 Claims
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1. A radiation pulse energy control system configured to control energy in a pulse of radiation passing through the system, comprising:
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a radiation detector that is configured to monitor the energy in the pulse of radiation; and an optical shutter that is configured to close in response to the radiation detector in order to trim part of the pulse of radiation passing through the system, wherein the radiation detector is configured such that a speed of response of the radiation detector equals a speed of response of the optical shutter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A laser, comprising:
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a radiation detector that is configured to monitor energy in a pulse of radiation; and an optical shutter that is configured to close in response to the radiation detector in order to trim part of the pulse of radiation passing through the system, wherein the radiation detector is configured such that a speed of response of the radiation detector equals a speed of response of the optical shutter.
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8. A lithographic apparatus, comprising:
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an illuminator configured to condition a pulsed beam of radiation; a radiation pulse energy control system configured to control energy in the pulse of radiation passing through the system, the radiation pulse energy control system comprising a radiation detector that is configured to monitor energy in a pulse of radiation, and an optical shutter that is configured to close in response to the radiation detector in order to trim part of the pulse of radiation passing through the system, wherein the radiation detector is configured such that a speed of response of the radiation detector equals a speed of response of the optical shutter; a patterning device configured to pattern the pulse of radiation leaving the shutter; and a projection system configured to project the patterned beam onto a target portion of a substrate.
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9. A device manufacturing method including modulating a pulsed beam of radiation and projecting the modulated beam onto a substrate, the method comprising:
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monitoring energy in the pulse of radiation using a radiation detector; and trimming the pulse of radiation through closure of an optical shutter, wherein a speed of response of the radiation detector is equal to a speed of response of the optical shutter. - View Dependent Claims (10, 11)
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Specification