Research on key techniques of broad-spectrum solar simulator

To meet the spectral requirements of solar simulators for ground testing and calibration of infrared space optoelectronic devices, a broad-spectrum solar simulator has been designed and studied. A xenon lamp is used as the light source for the visible spectrum, and a cavity black body is used as the radiation source for the mid-infrared spectrum. An infrared field lens set is designed to match the infrared radiation aperture with the visible light beam. After being combined by the beam splitter, the combined beams are then collimated by the off-axis parabolic mirror, achieving uniform illumination on the target surface. Experimental results show that the solar simulator matches the AM0 standard spectrum within the 0.4 μm~0.7 μm range with a consistency level of 0.9~1.1. The effective illuminated area is 150mm in diameter, with the divergence angle of ±1.7°. In the band of 3 μm~5 μm range, the integrated irradiance satisfies with theoretical predictions. This design not only enhances the authenticity of the spectral range, but also provides the radiation resistance and stray light interference resistance of infrared devices. It also lays the foundation for the design of larger-aperture, wider-spectrum solar simulators.