Actively stabilized, single input beam, interference...

Details Actively stabilized, single input beam, interference... Actively stabilized, single input beam, interference...

2007-12-04

2007-12-04

Chang, Audrey (Department: 2872)

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

C359S010000, C359S001000, C359S035000, C430S001000

Reexamination Certificate

active

09798746

ABSTRACT:
An interference lithography system is described that is capable of exposing high resolution patterns in photosensitive media and employing yield increasing active stabilization techniques needed in production environments. The inventive device utilizes a division-of-wavefront interference lithography configuration which divides a single large field size optical beam using one or more mirrors, and is actively stabilized with a subsystem employing; a phase modulator operating on each divided wavefront section; a novel feedback apparatus for observing the relative phase shifts between interfering wavefront sections; and a control system for holding the relative phase shifts constant. The present invention also includes; a method for shaping the illumination beam's intensity distribution for more efficient power utilization and greater feature size uniformity; a horizontal substrate loading configuration compatible with robotic handling; an automated pattern pitch calibration for simple, flexible system reconfiguration; a compact clean-room compatible superstructure for increased passive stability in high vibration manufacturing environments; and a method for optimizing the polarization state of the interfering beam sections in a multiple mirror system.

REFERENCES:
patent: 5142385 (1992-08-01), Anderson et al.
patent: 5216527 (1993-06-01), Sharnoff et al.
patent: 5892597 (1999-04-01), Iwata et al.
patent: 5949557 (1999-09-01), Powell

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