Scanning apparatus to detect the spectral directivity of optically-emissive materials

TL;DR

This paper introduces a scanning apparatus capable of measuring the spectral directivity of various optically-emissive materials, providing detailed angular emission profiles across the optical spectrum.

Contribution

The paper presents a novel device that characterizes the spectral directivity of emissive materials, including LEDs and ASE materials, across different angles and wavelengths.

Findings

Successfully measured the angular emission profile of an LED with a hemispherical diffuser.

Demonstrated the device's ability to characterize both fluorescence and ASE in materials.

Proved the apparatus's versatility for diverse emissive systems.

Abstract

An apparatus that records the optical spectrum of emissive materials as a function of the polar coordinate angles is reported. The ability for the device to characterize the directive gain of a light source over the optical spectrum is demonstrated. The angular emission profile of an electrically driven LED with a hemispherical diffuser cap was measured. In addition, the device was used to characterize optically pumped materials exhibiting both fluorescence and amplified spontaneous emission (ASE), demonstrating its versatility for diverse emissive systems.