Measurement of high conversion efficiency to 123.6-nm radiation in a four-wave-mixing scheme enhanced by electromagnetically induced transparency - art. no. 013802
C. Dorman et al., Measurement of high conversion efficiency to 123.6-nm radiation in a four-wave-mixing scheme enhanced by electromagnetically induced transparency - art. no. 013802, PHYS REV A, 6001(1), 2000, pp. 3802
We report measurements of the absolute yield of 123.6-nm vacuum ultraviolet
(VUV) radiation produced in a resonant four-wave-mixing scheme in krypton
enhanced by electromagnetically induced transparency. One of the mixing fie
lds, in the ultraviolet (UV) at 212.55 nm, was in two-photon resonance with
the 4p(6) S-1(0)-4p(5)5p[0, 1/2] transition of krypton, while a second fie
ld (the coupling field) at 759 nm was resonant with the 4p(5)5p[0, 1/2]-4p(
5)5s[1, 1/2] transition. Electromagnetically induced transparency has been
predicted to be induced by this coupling field and to enhance the efficienc
y of the generation of the field at 123.6 nm, on the 4p(5)5s[1, 1/2] to 4p(
6) S-1(0) transition. This was confirmed by measurements of the absolute VU
V radiation yield using a calibrated photodiode in the limit of a large den
sity-length product. Energies of similar to 30 nJ were produced. which gave
a conversion efficiency, from the coupling field energy of similar to 1%.
Higher yields are thought to be achievable by increasing the coupling laser
. intensity, the path length of the medium, and by the use of a transform-l
imited UV pulse of the same duration as the coupling field.