Littman, Novel geometry for single-mode scanning of tunable lasers. Fujimoto, Optical coherence tomography using a frequency-tunable optical source. Hecht, Optics (Addison-Wesley, Reading, 2002) Siegman, Lasers (University Science Books, Mill Valley, 1986)Į. Teich, Fundamentals of Photonics (Wiley, New York, 1991)Ī.E. Yariv, Photonics: Optical Electronics in Modern Communications (Oxford University Press, New York, 2007)ī.E.A. Vo-Dinh, Biomedical Photonics Handbook (CRC Press, Boca Raton, 2003)Ī. Derickson, Fiber Optic Test and Measurement (Prentice Hall PTR, Upper Saddle River, 1998) Finally, we discuss the principles of various techniques developed to date for high-speed and wide tuning range. We begin with a discussion general specifications of these light sources, the review basic fundamentals of laser and wavelength tuning. In this chapter, we describe a technical overview of these new emerging sources. Alternatively, a tunable light source emitting one wavelength at a time, rapidly swept over a broad spectral range, can also be used to achieve the absolute ranging capability in OCT. OCT traditionally has used broadband light sources providing a wide range of wavelengths, all simultaneously. To accomplish this, OCT is based on interferometry using many optical wavelengths, each serving as a “ruler” with different periodicities. In optical coherence tomography (OCT), one wishes to determine light scattering distances and distribution within a sample, but without the ambiguity. Although this approach offers unrivaled precision, the periodic signal results in a 2π ambiguity for measurement of lengths greater than one wavelength. At a given optical wavelength, an interference signal varies as a sinusoidal function of distance with a period equal to the wavelength. In optical interferometric metrology, the wavelength of light serves as a reference for length.
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