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News Release
April 22, 2004

ZYGO Selected to Supply the Large Beam Splitter Assembly

MIDDLEFIELD, CT, Apr. 22, 2004 (MARKET WIRE via COMTEX) -- Zygo Corporation (NASDAQ: ZIGO) announced today that they have received an order from the Massachusetts Institute of Technology Lincoln Laboratory (MIT LL) to supply the Large Beam Splitter Assembly (LBSA) for use in a high precision terrestrial laboratory based optical test-bed. The LBSA consists of a Large Beam Splitter (LBS) mounted in a Large Beam Splitter Mount (LBSM) to provide ultra-precision pointing and stabilization of a high power, high quality, laser beam for testing of free-space laser communication transceivers.

Under this agreement, ZYGO Optical Systems in Costa Mesa, California, will act as the prime contractor and perform the LBSA system design, integration and testing. ZYGO is recognized as the leader in the fabrication of large, precision, optical flats and the challenging beam splitter element will be fabricated in ZYGO's advanced optics facility in Middlefield, Connecticut.

"ZYGO is proud to be a supplier for MIT LL," said Bruce Robinson, Zygo Corporation's president and CEO. "MIT LL's selection of ZYGO is another major step toward our goal of expanding our presence in the defense and aerospace segment of our business."

Zygo Corporation (NASDAQ: ZIGO), headquartered in Middlefield, Connecticut, is a worldwide supplier of optical metrology instruments, precision optics, and electro-optical design and manufacturing services, serving customers in the semiconductor capital equipment and industrial markets. See ZYGO's web site at www.zygo.com for additional information.

All statements other than statements of historical fact included in this news release regarding the Company's financial position, business strategy, plans, anticipated growth rates, and objectives of management of the Company for future operations are forward-looking statements. Forward-looking statements are intended to provide management's current expectations or plans for the future operating and financial performance of the Company based upon information currently available and assumptions currently believed to be valid. Forward-looking statements can be identified by the use of words such as "anticipate," "believe," "estimate," "expect," "intend," "plans," "strategy," "project," and other words of similar meaning in connection with a discussion of future operating or financial performance. Actual results could differ materially from those contemplated by the forward-looking statements as a result of certain factors. Among the important factors that could cause actual events to differ materially from those in the forward-looking statements are fluctuations in capital spending in the semiconductor industry, fluctuations in net sales to our major customer, manufacturing and supplier risks, dependence on new product development, rapid technological and market change, international operations, dependence on proprietary technology and key personnel, length of the sales cycle, environmental regulations, and changes in expected costs of discontinued operations. Further information on potential factors that could affect Zygo Corporation's business is described in the Company's reports on file with the Securities and Exchange Commission, including its Form 10-K for the fiscal year ended June 30, 2003.

For Further Information Call:
Eric D'Ippolito
General Manager
ZYGO's Optics Business Segment
Costa Mesa, California

SOURCE: Zygo Corporation

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