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News Release
December 5, 1997


MIDDLEFIELD, CONNECTICUT (December 5, 1997)......Zygo Corporation (NASDAQ:ZIGO) announced today that it has shipped its 500th Growth Potential Interferometer since introducing the product family in 1994. The GPI family further extended the core interferometry technology which ZYGO first introduced in 1973. ZYGO has more than 2,500 large aperture systems installed around the world today.

The Growth Potential Interferometer, or GPI, family of products is designed to allow the user of the equipment to quantitatively measure the surface profile of a sample in three dimensions. GPIs are found in many high technology applications particularly in the production of optical components for precision measurement equipment, data storage products, semiconductors, and other parts requiring high precision metrology measurements.

Zygo Corporation designs, develops, manufactures, and markets high performance measurement and yield improvement instruments, systems, and accessories used in high technology industries. The Company is headquartered in Middlefield, Connecticut, and also has operations in Asslar, Germany; Longmont, Colorado; and in Newbury Park, Sunnyvale, and Simi Valley, California.

This press release may contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which reflect the Company's current judgment on certain issues. Because such statements apply to future events, they are subject to risks and uncertainties that could cause the actual results to differ materially. Important factors which could cause actual results to differ materially are described in the Company's reports on Form 10-K and 10-Q on file with the Securities and Exchange Commission.

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Defense+Sensing 04/17 - 04/19
CONTROL 04/24 - 04/27
Optatec 05/15 - 05/17
STLE Ann. Mtg. 05/20 - 05/24
SAMPE 05/22 - 05/23
Astro. Tel. & Inst. 06/12 - 06/14
SEMICON West 07/10 - 07/12
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