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This letter presents a high-fill-factor $60\,\, \times \,\, 1$ linear array of single-photon avalanche diodes (SPADs) and 60 integrated time-to-digital converters (TDCs). The 100-$\mu \text{m}$ diameter SPAD has high photon detection efficiency (50% at 420 nm), very low dark count rate (2.5 kcps at room temperature), and negligible crosstalk ($\sim 0.1$ % between adjacent pixels). The TDC resolution...
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