CERTIFICATION PURSUANT TO
                    18 U.S.C. SECTION 1350,
                    AS ADOPTED PURSUANT TO
          SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


     In connection with the Annual Report of II-VI Incorporated (the
"Corporation") on Form 10-K for the period ending June 30, 2002 as
filed with the Securities and Exchange Commission on the date hereof
(the "Report"), each of the undersigned officers of the Corporation
certifies, pursuant to 18 U.S.C. SS 1350, as adopted pursuant to Section
906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

(1)  The Report fully complies with the requirements of Section 13(a)
     or 15(d) of the Securities Exchange Act of 1934; and

(2)  The information contained in the Report fairly presents, in all
     material respects, the financial condition and result of
     operations of the Corporation.




Date:  September 25, 2002                 /s/ Carl J. Johnson
                                              Carl J. Johnson
                                         Chairman of the Board
                                        and Chief Executive Officer



*This certification is made solely for purposes of 18 U.S.C. Section
1350, subject to the knowledge standard contained therein, and not for
any other purpose.