EXHIBIT 99.1

     CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
        (SUBSECTIONS (a) AND (b) OF SECTION 1350, CHAPTER 63 OF TITLE 18,
                               UNITED STATES CODE)

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and
(b) of section 1350, chapter 63 of Title 18, United States Code), each of the
undersigned officers of Zygo Corporation, a Delaware corporation (the
"Company"), does hereby certify with respect to the Annual Report of the Company
on Form 10-K for the year ended June 30, 2002 as filed with the Securities and
Exchange Commission (the "10-K Report") that:

(1)  the 10-K Report fully complies with the requirements of section 13(a) and
     15(d) of the Securities Exchange Act of 1934: and

(2)  the information contained in the 10-K Report fairly presents, in all
     material respects, the financial condition and results of operations of the
     Company.

Dated:  September 13, 2002


/s/ J. Bruce Robinson
------------------------------------
J. Bruce Robinson
Chairman, President, and
Chief Executive Officer of
Zygo Corporation

Dated:  September 13, 2002


/s/ Richard M. Dressler
------------------------------------
Richard M. Dressler
Vice President, Finance,
Chief Financial Officer of
Zygo Corporation


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