Attached files

                                                                 Exhibit 32.2

ROFIN-SINAR TECHNOLOGIES INC.
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 Quarterly Report of Rofin-Sinar Technologies Inc. (the
"Company") on Form 10-Q for the quarter ended March 31, 2011 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Ingrid Mittelstaedt, Chief Financial Officer of the Company, certify,
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)
    or 15(d), as applicable, 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 results of operations of the
    Company.

This Certification has not been, and shall not be deemed, "filed" with the
Securities and Exchange Commission.


Date:   May 10, 2011

                                            /s/ Ingrid Mittelstaedt
                                         -------------------------------
                                              Ingrid Mittelstaedt

                                          Chief Financial Officer,
                                          Executive Vice President,
                                          Finance and Administration,
                                          and Treasurer