Measurements of Cavity-Length-Dependent Internal Differential Quantum Efficiency and Internal Optical Loss in Laser Diodes

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We measured the cavity length dependence of the internal differential quantum efficiency $\eta_{\text{int}}$ and the internal optical loss $\alpha_{\text{int}}$ in 1500-nm-wavelength laser diodes (LDs). By evaluating $\alpha_{\text{int}}$ directly from gain/absorption spectra for various injection current densities and measuring the external differential quantum efficiency $\eta_{\text{ext}}$, we obtained the $\eta_{\text{int}}$ and $\alpha_{\text{int}}$ values of all the LDs with different cavity lengths. The obtained $\eta_{\text{int}}$ and $\alpha_{\text{int}}$ respectively showed strong and weak cavity length dependences, and were both very different from those derived by the widely used method of plotting $\eta_{\text{ext}}^{-1}$ against the cavity length.
2008-04-25