THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

Coherent, Inc. (COHR)

2/28/2006 Proxy Information

Bernard J. Couillaud served as President and Chief Executive Officer as well as a member of the board from July 1996 through September 2002.

Henry E. Gauthier is a former Chairman and executive of Coherent, Inc.

Robert J. Quillinan was Executive Vice President of Mergers and Acquisitions from April 2002 through April 2003. He served as Coherent's Executive Vice President and Chief Financial Officer from July 1984 through March 2002, Vice President and Treasurer from March 1982 to July 1984, and as Corporate Controller from May 1980 to March 1982.

The following table sets forth information with respect to all executive officers and directors of the Company who had indebtedness outstanding during the past fiscal year. This indebtedness arose as a result of the delivery of promissory notes in connection with the exercise of stock options: (see page 24 of proxy for table).

All promissory notes are full recourse and, except for the $30,000 of principal outstanding on the loans to Dr. Ambroseo, are secured by the shares of common stock of the Company issued upon exercise of the options.

Interest on stock notes is compounded. Interest on Dr. Ambroseo’s note on which $30,000 of principal is outstanding is paid quarterly as a deduction from his Variable Compensation Plan.

3/7/2005 Proxy Information

Bernard J. Couillaud served as President and Chief Executive Officer as well as a member of the board from July 1996 through September 2002.

Henry E. Gauthier is a former Chairman and executive of Coherent, Inc.

Robert J. Quillinan was Executive Vice President of Mergers and Acquisitions from April 2002 through April 2003. He served as Coherent's Executive Vice President and Chief Financial Officer from July 1984 through March 2002, Vice President and Treasurer from March 1982 to July 1984, and as Corporate Controller from May 1980 to March 1982.

2/27/2004 Proxy Information

Bernard J. Couillaud served as President and Chief Executive Officer as well as a member of the board from July 1996 through September 2002.

Henry E. Gauthier is a former Chairman and executive of Coherent, Inc.

Robert J. Quillinan was Executive Vice President of Mergers and Acquisitions from April 2002 through April 2003. He served as Coherent's Executive Vice President and Chief Financial Officer from July 1984 through March 2002, Vice President and Treasurer from March 1982 to July 1984, and as Corporate Controller from May 1980 to March 1982.