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We experimentally demonstrate the dual synchronization of chaos in two pairs of Nd:YVO(4) microchip lasers in a one-way coupling configuration over one transmission channel. Dual synchronization is achieved when the optical frequency is matched between the corresponding pairs of lasers by using injection locking. We investigate the influence of optical injection from the two master lasers to one slave laser, and found that the dual synchronization is observed when the injection locking is achieved between either of the master lasers and the slave laser. Under the condition of the injection locking between both of the master lasers and the slave laser, the injection locking is alternately achieved and the accuracy of dual synchronization is degraded. We also confirm these results by numerical calculation.

Near-infrared distributed feedback (DFB) semiconductor laser spectroscopy of acetylene has been carried out from 6450 to 6570 cm-1 with an accuracy of about 0.0033 cm-1. The molecular constants of the (1010000)–(0000000), (1011100)–(0001100), and (1010011)–(0000011) bands of 12C2H2 and the (1010000)–(0000000) and (0020000)–(0000000) bands of 12C13CH2 have been precisely determined. The transition frequencies calculated from the constants can be used as references for optical communication systems.

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We have achieved dual synchronization of chaos in two pairs of one-way coupled Nd:YVO4 microchip lasers, using only one transmission channel, by experiment and numerical calculation. We observed the individual synchronization of chaos in each pair of two lasers by adjusting the optical frequencies for injection locking between the corresponding pairs. The achievement of dual synchronization is dependent on the injection-locking condition, which is different from the locking condition for a single pair of lasers because of the presence of an additional injection signal from the master laser of the other pair.