Two diode-pumped Nd:YAG lasers are combined with their polarization vectors at 90 degrees to each other to create a depolarized source suitable for propagation over long lengths of ordinary, low-birefringence single-mode fiber without a change in the polarization state. The source is demonstrated with an integrated-optical Mach-Zehnder interferometer and provides a constant -3.dB intensity input to the required linear input polarization state.
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Burns et al. (1991) studied this question.
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