1.  The Invention The Suzhou Submission Form
	Title: Vertical-cavity surface-emitting diode laser (VCSEL) with two different oxide apertures. The problem the inventor(s) wanted to solve: Enhance mode selectivity in large-size oxide-confined VCSELs, strong enough to enable higher output stable single-fundamental-mode operation over a wide range changes of the ambient temperature. Description. Oxide apertures in VCSELs are located typically on both sides of the active region in anti-node positions of the optical standing wave, acting as both optical and electrical apertures. For an efficient radial optical confinement mechanism, it is enough to place only one oxide aperture in the anti-node position (optical aperture) and the second one may be shifted even to the node position, where it is working as the electrical aperture only. Presentation: The new VCSEL structure consists of larger upper oxide aperture (assumed to be equal to active region diameter) located in the anti-node position of the radiation standing wave and the smaller one located below the active region in the node position. Fields of application: optoelectronics Advantages: As a result, mode selectivity mechanism is considerably enhanced and the device thermal properties are essentially improved. VCSELs of the proposed design enable single-fundamental-mode operation achieved at much higher output power and/or at much higher temperatures. Stage of development. Design Documentation available:  (X) No   ( ) Yes
2.  The inventor (or inventors)
	Name(s) Robert P. SARZALA, Wlodzimierz NAKWASKI, and Michal WASIAK Self introduction. He is interested in simulation of optical, electrical thermal and mechanical phenomena taking place during the operation of in-plane diode lasers and vertical-cavity surface-emitting diode lasers as well as of diode-laser arrays. Owner of the invention? (Is it the inventor?)   (X) No  () Yes Technical University of Lodz
3.  Protection
	Patent Status:     - Patent pending. Poland nr P-370876 Priority (date of the very first patent application) 25.10.2004
4.  Business intention Looking for investor(s)
5.  Contact
	Name Robert P. SARZALA, Institute of Physics, Technical University of Lodz Address: 90-924 Lodz, ul. Wolczanska 219, Poland Fax (+4842 6313639)      Tel +4842 6313668 E-mail: rpsarzal@p.lodz.pl