As to date, there are several relatively new crystals that have been developed for nonlinear or "parametric" optical applications, including KTP, LAP, KNbO3, m=NA, and BaB204 (barium borate, or simply BBO). The latter crystal, BBO, and the use of BBo to achieve parametric oscillation around an eyesafe wavelength of 1.54 microns is the emphasis of this paper.
Unpublished material includes determining the optimum type of coupling and pump wavelength used when generating 1.54 μm eyesafe radiation based upon Poynting vector walk off, suscpetibilityies, and both signal angular and spectral acceptance widths. Poynting vector walk off curves for linearly polarized extraordinary waves are presented for the second, third, and fourth harmonics of a Nd:YAG source. Both angular and spectral acceptance width curves represent second order sensitivity analysis that are extended to include general three wave mixing opposed to just second harmonic generation. The generation of a 1.54 micron signal will be shown to be most efficient using type I coupling and a 532 nm pump. And, for this type I/532 nm pump process, both angle tuning sensitivity and gain bandwidth curves are introduced. Type III phase matching curves are also presented for both 532 nm and 355 nm pumps. It will be shown, however, that 1.54 micron generation via type III mixing exhibits the lowest suceptibility while inducing the highest Poynting vector walk off when a 532 nm pump is used. Finally, with BBO's extreme temperature stability and solid state compactness (parametric oscillation), BBO is proposed as a viable alternative to more traditional sources of eyesafe radiation, such as Er:glass (lasing medium) and methane (Raman medium), for operation in changing environments and where the added option of tunable radiation is desired.
Walters, Roy A.
Master of Science (M.S.)
College of Engineering
Electrical Engineering and Communication Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic
Kerrigan, Mark, "Barium borate in parametric oscillation and 1.54 micron generation" (1988). Retrospective Theses and Dissertations. 4297.