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News Release
April 1, 1998


MIDDLEFIELD, CONNECTICUT (April 1, 1998)......Zygo Corporation (NASDAQ:ZIGO) announced today that it has received the first order for its new MESA system from a customer in the industrial sector. MESA, introduced in late 1997, provides customers the ability to measure the surface shape, in three dimensions, of parts which are nonspecular and previously could not be measured using standard interferometry. The advantages of ZYGO's patented approach are its noncontact, high speed, and large field-of-view as well as its three-dimensional capability. Additionally, the MESA system has many features previously not available in interferometric measurement systems including a long working distance, ability to measure from nonspecular to specular parts, a reduction in vibration sensitivity and departure tolerance of 20 times that of standard interferometry, as well as high spatial resolution.

Thom Connolly, product manager of Large Aperture Systems for ZYGO, commenting on the significance of this order for an industrial application commented, "This initial order for MESA for an industrial application is extremely important as we have penetrated what we expect will be a very significant market for years to come. We are extremely encouraged by the performance of the system as evidenced by consistent gauge repeatability and reproducibility (GRR) performance." ZYGO is working with many producers of precision machined parts where part dimensional tolerances require the use of fast and accurate optical measurement. Examples include pump and internal combustion engine parts for the automotive industry, semiconductor parts, and a variety of parts used in hard disk drives. The first MESA orders, received since January of this year, have been installed at data storage customers using the system for disk flatness measurement.

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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