Tunable and continuous wave (cw) near infrared up‐conversion into the dark blue wavelength range (410–465 nm) has been achieved in KNbO3 crystals using the nonlinear optical coefficient d32 (ω1+ω2; ω1,ω2)=20.4 pm/V. High efficiencies have been reached due to the large nonlinearity and the possibility of temperature‐tuned noncritical 90° phase matching. Using a neodymium:yttrium aluminum garnet laser (1064.2 nm) as the signal source and a krypton laser (676.4 nm) as the pump source, a sum signal (413.6 nm) power of over 0.1 mW was reached at a pump power of only 26.2 mW. cw image up‐conversion into the blue wavelength range has been demonstrated using a noncritically phase‐matched configuration in the same crystals at T=−4 °C.
REFERENCES
1.
2.
3.
4.
K. S.
Krishnan
, J. S.
Ostrem
, and E. A.
Stappaerts
, Opt. Eng.
17
, 108
(1978
).5.
E. S.
Voronin
and V. L.
Strizhevskii
, Sov. Phys. Usp.
22
, 26
(1979
).6.
R. Sanctuary, Diploma Thesis, ETH‐Zürich, 1979 (unpublished).
7.
J.‐C.
Baumert
, J.
Hoffnagle
, and P.
Günter
, Proceedings of the 1984 European Conference on Optics, Optical Systems and Applications, Amsterdam, SPIE
492
, 374
(1985
).8.
A. Yariv, Quantum Electronics (Wiley, New York, 1975), Chap. 17.
9.
10.
J.‐C.
Baumert
, P.
Günter
, and H.
Melchior
, Opt. Commun.
48
, 215
(1983
).11.
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1987
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