EXHIBIT 99.1


              CERTIFICATION OF CHIEF EXECUTIVE OFFICER 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 Quarterly Report of AXT, Inc. (the "Company") on Form
10-Q for the period ending June 30, 2002 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), Morris S. Young, as Chief
Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C.
Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of
2002, that:

        (1) The Report fully complies with the requirements of section 13(a) 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
Company.


August 12, 2002                           /s/ Morris S. Young

                                              Morris S. Young
                                              Chief Executive Officer