Objective 800 nm diode lasers with high power and high beam quality are the recommended laser sources for long-distance laser illumination and laser wireless energy transfer applications. However, due to the restricti...
详细信息
Objective 800 nm diode lasers with high power and high beam quality are the recommended laser sources for long-distance laser illumination and laser wireless energy transfer applications. However, due to the restrictions of material gain and epitaxial structure, 800 nm diode lasers have the drawbacks of relatively low power and poor beam quality. Spectral beam combining (SBC) is one of the most dependable beam combining techniques for high-power diode lasers to achieve high beam quality and high brightness. SBC in an external cavity feedback configuration has been implemented with success in the 800-900 nm band. In order to increase the SBC power, it is necessary to further increase the numbers of laser units, but this will lead to the increase of the size of optical components and the length of optical path, which brings great difficulties for installation and adjustment. The physical size of the SBC laser can be lowered by adding the relay imaging structure, but the issue of the huge size of optical elements also exists. Especially for the SBC source with the combining number of over 10 diode laser arrays (LDAs), the output pointing of each LDA is susceptible to be inconsistent due to packaging, micro lens assembly, and other factors. Moreover, the conventional relay imaging structure cannot be optimized for each LDA, and the SBC performance will be significantly reduced, including the power, beam quality, and efficiency. Methods An SBC structure with separated reflection relay imaging is suggested (Fig. 1). The large-size relay imaging lens is decomposed into a combination of multiple small-size cylindrical mirrors with the same focal length as that of the large-size lens. Each cylindrical mirror matches a specific LDA, and its optical axis aligns with the corresponding LDA emission direction. By modifying the cylindrical mirror, the separated relay imaging structure can compensate for the pointing inconsistency and optical aberration to a certain extent, achievi
暂无评论