Abstract
Optical frequency combs are radiation patterns of discrete, equally-spaced frequencies, originally conceived for frequency metrology and nowadays routinely used in a wide range of scientific and technological applications [1]. Ultrafast mode-locked lasers, first used for comb generation, have then been joined by continuously-pumped Kerr microresonators, exploiting the third-order nonlinearity of the materials [2], and by quantum cascade lasers [3]. Materials with second-order susceptibility, χ(2), have been used for transferring otherwise generated OFCs to different spectral regions. However, more recently, frequency comb generation has been observed in a continuously-pumped singly-resonant optical parametric oscillator (OPO) with an additional nonlinear crystal [4].
© 2015 IEEE
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