MENLO PARK, CA, JANUARY 9, 2008—Ultra Clean Technology (Ultra Clean Holdings, Inc. - NASDAQ: UCTT), a leading developer and supplier of critical subsystems for the semiconductor capital equipment industry announced today it has entered into a partnership agreement with Photon Dynamics, Inc. (NASDAQ: PHTN) to manufacture, integrate and test Photon Dynamics’ ArrayCheckerTM test products. The agreement includes ArrayChecker test products of earlier generations as well as current development products. As module manufacturing requires a considerable amount of time and resources - and can have direct impact on equipment development costs, Photon Dynamics, Inc. has chosen to partner with Ultra Clean for these critical systems. The first shipment of Photon Dynamics’ test products will be manufactured in Ultra Clean’s South San Francisco facility in the first quarter of 2008, and is expected to be ready for delivery later the same quarter.  Subsequent manufacturing will take place in the second quarter of 2008 at UCT's Shanghai facility with delivery scheduled for summer 2008. The ArrayChecker product line is Photon Dynamics’ market leading LCD (Liquid Crystal Display) array test system.

Ultra Clean Technology will provide turnkey manufacturing (including highly specialized electromechanical modules) for new and legacy versions of Photon Dynamics' ArrayChecker test products. The systems will be assembled, tested and qualified as part of a large-scale system integration program. The industry’s migration toward larger display panels is driving the need to maximize manufacturing yields. Advanced test equipment thus becomes increasingly critical with each successive product generation.

"Our ability to deliver an end-to-end solution for these unique systems on schedule, in key locations, demonstrates that Ultra Clean has the agility and means to participate in a successful, long-term relationship with Photon Dynamics," remarked Mr. Clarence Granger, Ultra Clean’s Chairman and Chief Executive Officer. Granger continued, "I believe our proven manufacturing expertise, exceptional customer support and sound business practices were significant factors contributing to this new strategic partnership."
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About Ultra Clean Holdings, Inc.
Ultra Clean Holdings, Inc. (Ultra Clean Technology) is a developer and supplier of critical subsystems for the semiconductor capital equipment industry. Having gained a global reputation for gas delivery systems, Ultra Clean now offers its customers a complete outsourced solution for liquid and gas delivery systems, and a growing list of critical subsystems. Ultra Clean can facilitate improved design-to-delivery cycle times and offers component neutral design and manufacturing and component testing capabilities. Ultra Clean’s customers are primarily original equipment manufacturers of semiconductor capital equipment. Ultra Clean is headquartered in Menlo Park, California. Additional information is available at the UCT web site www.uct.com

About Photon Dynamics, Inc.
Photon Dynamics, Inc. (NASDAQ: PHTN), is a global supplier utilizing advanced machine vision technology for market leading LCD flat panel display test and repair systems and for high performance digital imaging systems for defense, surveillance, industrial inspection and medical imaging applications. For more information about Photon Dynamics, Inc. visit: www.photondynamics.com.

Safe Harbor Statement
The foregoing information contains, or may be deemed to contain, "forward- looking statements" (as defined in the U.S. Private Securities Litigation Reform Act of 1995) which reflect our current views with respect to future events and financial performance. We use words such as "anticipates," "believes," "plan," "expect," "future,"' "intends," "may," "will," "should," "estimates," "predicts," "potential," "continue" and similar expressions to identify these forward-looking statements. All forward-looking statements address matters that involve risks and uncertainties. Accordingly, our actual results may differ materially from the results predicted or implied by these forward- looking statements. These risks, uncertainties and other factors include, among others, those identified in "Risk Factors," "Management's Discussion and Analysis of Financial Condition and Results of Operations'' and elsewhere in Ultra Clean’s annual report on Form 10-K for the year ended December 29, 2006 and quarterly report on Form 10-Q for the quarter ended September 28, 2007 and Photon Dynamic’s annual report on Form 10-K for the year ended September 30, 2006 and quarterly report on the Form 10-Q for the quarter ended March 31, 2007 filed with the Securities and Exchange Commission. Ultra Clean Technology and Photon Dynamic’s undertakes no obligation to publicly update or review any forward-looking statements, whether as a result of new information future developments or otherwise.