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duct The review of this paper was arranged by lGa de ver am In addition, the effective thermal diffusivity of chip increases with total operating current. On the hori-zontal thermal conduction path, the time constant varies linearly with the distance increasing, and the effective thermal diffusivity remains almost constant. The results suggest that the thermal crosstalk between emitters increases with the total operating current. As act-state ions, a emitter has been used to understand the behavior and degradation of the individual emitters [11]. Laikhtman et al. have optimized the structure of laser diode arrays that higher output powers require higher fill factors for minimum active region temperatures [12]. As mentioned above, the thermal properties of laser diode bars have critical effects on the performance of LDBs. However the properties of transient thermal crosstalk between emitters are A high-power LDB is an array of parallel single emitters, which share a common substrate and heat sink. The commercial 808 nm emitting high-power laser diode bars grown by metal–organic chemical vapor deposition (MOCVD) were used in this work, and they were designed for 10-W continuous-wave (CW) operation with AlGaAs/GaAs quantum well (QW) structure. Fig. 1a presents the schematic diagram of the LDB. The bar contained a linear array of 10 emitters which were 100-lm wide, 1000-lm long, and sep-arated by 200 lm isolation regions. Among the bar each emitter had an individual p-side electrode and all emitters shared