期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.143902
关键词
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资金
- Australian Research Council [FL0992016, CE11E0082]
- Australian Research Council [FL0992016] Funding Source: Australian Research Council
Nonlinear frequency conversion is a well known and widely exploited family of effects in optics, often arising from a Kerr nonlinearity in a crystal medium. Here, we report high stability frequency conversion in the microwave regime due to a chi((3)) nonlinearity in sapphire introduced by a dilute concentration of paramagnetic spins. First, we produce a high stability comb from two microwave fields at 12.029 and 12.037 GHz corresponding to two high Q-factor whispering gallery (WG) modes within the electron spin resonance bandwidth of the Fe3+ ion. The resulting comb is generated by a cascaded four-wave mixing effect with a 7.7 MHz repetition rate. Then, by suppressing four-wave mixing by increasing the threshold power, third harmonic generation is achieved in a variety of WG modes coupled to various species of paramagnetic ion within the sapphire.
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