A fiber-based wave-mixing probe is presented as a simple spectroscopic measurement tool with minimum optical alignment requirements for trace-concentration analytes. For a multi-photon nonlinear laser-induced grating method to become widely accessible, the optical setup must be compact, easy to align and portable. We demonstrate a significant improvement in the forward-scattering (self-diffraction) wave-mixing optical setup using optical fibers for both laser input and signal output interfaces. There is considerable flexibility inherent in the design, since the wave-mixing probe can be used in multiple configurations. Wave-mixing spectroscopy is presented as an effective and sensitive analytical method for trace analysis, offering advantages such as detection in very small sample volumes, remote and in-situ analyses, and convenient and efficient alignment enhancements obtained by the use of optical fibers.
展开▼
