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Franks, Catherine A; Palisano, Robert J.; Darbee, Joan C

doi:10.1093/ptj/71.8.579

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Second Order Nonlinear Processes1

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2012

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“…The quantity χ is a constant only in the sense of being independent of E; its magnitude is a function of the frequency. With sufficiently intense laser radiation this relation does not hold good and has to be generalized to equation (2), which can be written in the vector form, as by a power series…”

Section: Second Order Nonlinear Processesmentioning

confidence: 99%

Tuning of Wavelengths for Producing Eye Safe Laser Using Second Order Nonlinear Processes

Semwal¹,

Bhatt²

2012

OPTICS

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We are introducing here conversion of eye hazardous laser to the eye safe region by Optical Parametric Oscillation (OPO) method, using nonlinear optical crystals. The practical optical parametric oscillator device consists of a nonlinear crystal enclosed in an optical resonant cavity pumped by Nd:YAG laser. Optical parametric devices generate broadly tunable coherent optical radiations by the phase-matching nonlinear optical interaction of an intense laser beam with this nonlinear crystal. In this process the high energy pump photon is converted into a pair of lower frequency signal and idler photons while conserving the total energy and momentum. Tunability of the signal-idler pair is usually achieved by changing the crystal birefringence of the angular dependence of the extraordinary index of the nonlinear crystal. The output energy is an eye safe radiation at either, or both the signal and idler wavelengths.

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Section: Second Order Nonlinear Processesmentioning

confidence: 99%