The authors survey 26 excited-state transitions of argon (Ar), krypton (Kr), and neon (Ne) around 1.3 and 1.5 mu m. A 1200-lines-per-mm grating mounted on a piezoelectric translator forms the adjustable reflective element of an external cavity semiconductor laser, reducing the laser linewidth to>
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Lucero et al. (1991) studied this question.
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