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Collimation of high-power diode lasers using fast gradient index lenses with wavefront correction elements

 

AMA Fachverband für Sensorik e.V., Wunstorf:
OPTO '98. 3. Internationaler Kongreß und Fachausstellung für Optische Sensorik, Meßtechnik und Elektronik. Kongreßband
Wunstorf: ACS Organisations GmbH, 1998
S.29-34
Internationaler Kongreß und Fachausstellung für Optische Sensorik, Meßtechnik und Elektronik (OPTO) <3, 1998, Erfurt>
Englisch
Konferenzbeitrag
Fraunhofer IOF ()
cylindrical GRIN lens; high power diode laser collimation; micro optics; wavefront correction element

Abstract
A wavefront correction element (WFCE) is produced to make a cylindrical Ag-ion exchanged gradient index (GRIN) lens with a high numerical aperture (0.53) diffraction limited (wavefront error: 0.02 lambda root mean square). The wavefront aberrations of the cylindrical GRIN lens are measured by a phase-shifting shearing interferometer, using a conventional microscope objective as compensation lens. The continuous surface relief of the WFCE is produced by a lithographic process. The wavefront corrected GRIN lens is applied to collimate the strongly divergent light (57 degree full diverging angle measured at 1/e2 of maximum intensity) emitted by a highpower diode laser. The power irradiated into a full angle of 2 mrad could be enhanced by a factor of 1.8 using the WFCE.

: http://publica.fraunhofer.de/dokumente/PX-8054.html