Coherent light generators – Optical fiber laser
Patent
1998-04-10
1999-11-23
Scott, Jr., Leon
Coherent light generators
Optical fiber laser
372 19, 372 32, 372102, H01S 330
Patent
active
059913142
ABSTRACT:
A Yb-doped cladding pumped fiber laser includes a reflective grating located at each distal end of the laser cavity. Each reflective grating can reflect light propagating inside a fiber core and at a desired wavelength range. A plurality of band-rejecting gratings are disposed between the reflective gratings, whereby the band-rejecting gratings can couple light at an undesired wavelength range and out of the fiber core. When the band-rejecting gratings are in an end-to-end relationship, they are separated by a distance of approximately L whereby L=[(.sigma..sub.e.sup.d +.sigma..sub.a.sup.d)ln 1/T]/[n(.sigma..sub.a.sup.d .sigma..sub.e.sup.u -.sigma..sub.e.sup.d .sigma..sub.a.sup.u)], n is a concentration of ions subject to excitation, .sigma..sub.a.sup.d is an absorption cross section at said desired wavelength range, .sigma..sub.e.sup.u is an emission cross section at said undesired wavelength range, .sigma..sub.e.sup.d is an emission cross section at said desired wavelength range, .sigma..sub.a.sup.u is an absorption cross section at said undesired wavelngth range, and T is a band-rejecting grating transmission factor. The number of band-rejecting gratings is given by N whereby N=d/L.gtoreq.dn (.sigma..sub.a.sup.d .sigma..sub.e.sup.u -.sigma..sub.e.sup.d .sigma..sub.a.sup.u)/[.sigma..sub.e.sup.d +.sigma..sub.a.sup.d) ln 1/T] and d is the length of the laser.
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Vengsarkar, A.M., et al. "Long-Period Fiber Gratings as Band-Rejection Filters" IEEE, Journal of Lightwave Technology, vol. 14, No. 1, (Jan. 1996) pp. 58-65.
Hanna, D.C., et al. "An ytterbium-doped monomode fibre laser; broadly tunable operation from 1.010.mu.m to 1.162.mu.m and three-level operation at 974 nm" Journal of Modern Optics, (1990) vol. 37, No. 4, pp. 517-525.
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Ionov Stanislav I.
Jones Dennis C.
Mangir Metin S.
Duraiswamy V. D.
Hughes Electronics Corporation
Jr. Leon Scott
Sales M. W.
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