| 摘要 |
Method and system for converting a first light beam having a first frequency into a second light beam having a second frequency. A pump photon having (angular) frequency 3omega (or 4omega) is provided within an optical cavity, defined by two mirrors that are fully reflecting at a frequency 2omega. In a first approach, the pump photon is received and down-converted (3omega->2omega+omega) by a first nonlinear crystal, and the 2omega photon is further down-converted (2omega->omega+omega) by a second nonlinear crystal), to produce three photons (omega+omega+omega) that exit from the cavity. In a second approach, the pump photon is received and down-converted (4omega->2omega+2omega) by a first nonlinear crystal, and one or both of the 2omega photons is further down-converted (2omega->omega+omega) by a second nonlinear crystal).
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