Exhibit 23.1


                         Consent of Independent Auditors


We consent to the incorporation by reference in the Registration Statement (Form
S-3  Nos.  333-33968,  333-44104,  and  333-33966) and in the related Prospectus
Supplement  and Form S-8 Nos. 333-44500, 333-44488, and 333-44486 of APA Optics,
Inc.  of our report dated May 11, 2001, with respect to the financial statements
of  APA  Optics,  Inc.  included  in this Form 10-K for the year ended March 31,
2001.

                                             /s/  Ernst  &  Young  LLP

Minneapolis,  Minnesota
June  28,  2001