| 摘要 |
<p>The appts. includes a laser diode, two dichroic mirrors (M1,M2), and a non-linear medium. The laser diode emits a wave through the first inclined mirror (M1), the medium and the second return mirror (M2). The mirrors are highly transparent to the emitted wavelength and highly reflective to the wave of half the wavelength. The second mirror introduces a phase shift, x, in the harmonic wave and a phase shift, y, in the pump wave such that mod(2x-y)=PI. The tuning is ensured by the medium's birefringence or by the periodic spacial modulation of a physical property of the medium. The source may emit in the near infra-red at 860 nm and the medium be a waveguide of lithium titanate, potassium titanium phosphate or lithium niobate integrated with the mirrors.</p> |
