Lambda Physik Ag

Guenter Nowinsk

Uwe Stamm

Hans-Stephan Albrecht

A lithography laser system for incorporating with a semiconductor processing system includes a discharge chamber filled with a laser gas including molecular fluorine and a buffer gas, multiple electrodes within the discharge chamber and connected with a discharge circuit for energizing the laser gas, a resonator including the discharge chamber for generating a laser beam, and a processor. The processor runs an energy control algorithm and sends a signal to the discharge circuit based on said algorithm to apply electrical pulses to the electrodes so that the laser beam exiting the laser system has a specified first energy distribution over a group of pulses. The energy control algorithm is based upon a second energy distribution previously determined of a substantially same pattern of pulses as the group of pulses having the first energy distribution. The second energy distribution is determined for the laser beam at a location after passing the beam through beam shaping optical elements of the semiconductor processing system while a value of the energy of the laser beam exiting the laser system is maintained at an approximately constant first energy.

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Unterwellenborn, Germany

Guenter Nowinsk