System and method for dose control in a lithographic system
First Claim
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1. An apparatus, comprising:
- an illumination system comprising,a light source; and
an adjusting system including an optical attenuator that adjusts light output from the light source to produce a desired light output signal; and
a spatial light modulator arranged to receive the light output signal.
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Abstract
A system and method are used for pulse to pulse dose control in an illumination system, used, for example, in a lithography or a maskless lithography machine. The system and method can be used to decrease effective laser pulse-to-pulse variability in lithographic lasers, allowing adequate dose control using a minimum number of pulses (e.g. as little as one pulse).
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Citations
23 Claims
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1. An apparatus, comprising:
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an illumination system comprising, a light source; and an adjusting system including an optical attenuator that adjusts light output from the light source to produce a desired light output signal; and a spatial light modulator arranged to receive the light output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An illumination system, comprising:
a light source including, a first light source that produces a first light beam having an energy value with an energy variation value; and a second light source that produces a second light beam having an energy value about equal to the energy variation value. - View Dependent Claims (11, 12, 13)
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14. A method, comprising:
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generating a first beam of light with a first light source; measuring an energy level of the first beam of light; comparing the measured energy level with a desired energy level; generating a second beam of light with a second light source that has an energy level that compensates for the difference between the measured energy level and the desired energy level; and summing the first beam of light and the second beam of light to produce a summed beam of light. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification