Characteristics of 1520 nm InGaAs multijunction laser power converters

Eight-junction In0.53Ga0.47As laser power converters (LPCs) designed for converting the laser energy around 1520 nm are demonstrated with a maximum room-temperature (RT) conversion efficiency of 36.9 & PLUSMN; 0.9% at 53.9 W/cm(2). Subcell photocurrents of the LPC are extracted from current steps in wide-voltage-range I-V curves, and the current mismatching degree (C-m) at RT is determined to be & SIM;5%. Temperature dependence of the C-m of the InGaAs LPC confirms that the LPC reaches its minimal C-m around RT. Finally, the LPCs are characterized under different temperatures and laser powers, and the temperature coefficients of the open circuit voltage and conversion efficiency are fitted to be -12 mV/K and -0.155%abs/K, respectively. The experimental results show the potential of In0.53Ga0.47As multijunction LPCs for applications in free space and fiber-based long distance laser power transmission.

Automated summary

This study demonstrates high efficiency and superior performance of In0.53Ga0.47As multijunction LPCs in converting laser energy around 1520 nm, with minimal current mismatching degree near room temperature. Furthermore, characterization under different temperatures and laser powers shows stable temperature coefficients of the open circuit voltage and conversion efficiency.