Optical: systems and elements – Single channel simultaneously to or from plural channels – By surface composed of lenticular elements
Patent
1996-01-16
1998-06-16
Nelms, David C.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By surface composed of lenticular elements
359619, 372103, 264 137, G02B 2710, H01S 0308, B29D 1100
Patent
active
057680221
ABSTRACT:
This invention teaches a method for fabricating a microlens within a window of a laser diode assembly, and a laser diode assembly fabricated in accordance with the method. The method includes the steps of (a) providing a laser diode assembly that includes a window that is substantially transparent at wavelengths emitted by a laser diode within the assembly, the window comprising a wavelength-selective absorber of electromagnetic radiation; and (b) irradiating a portion of a surface of the window with electromagnetic radiation having wavelengths within a range of wavelengths that are absorbed by the wavelength selective absorber such that a portion of the electromagnetic radiation is absorbed for heating and melting the material adjacent to the surface region, whereby the melted material rises up above the surface to form, when re-solidified, the microlens. In one embodiment of this invention the step of irradiating includes a step of focussing the electromagnetic radiation to have a shape that corresponds to a shape of the microlens. In another embodiment of this invention the step of irradiating includes a step of translating the window with respect to the electromagnetic radiation so as to form a generally cylindrical microlens. The microlens may be so formed to have a length and width in the range of micrometers to hundreds of micrometers.
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Brown University Research Foundation
Mack Ricky
Nelms David C.
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