Nonlinear refraction in potassium gadolinium tungstate: An efficient Raman crystal and laser host

Dharmadhikari, J.A.; Dharmadhikari, A.K.; Kumar, G.R.
September 2003
Applied Physics Letters;9/29/2003, Vol. 83 Issue 13, p2527
Academic Journal
Third order nonlinear optical properties of a promising laser host and Raman shifting crystal—potassium gadolium tungstate are reported. The intensity dependent refractive index, n[sub 2], measured at 1064 and 532 nm are 8.76×10[sup -16] and 43.1×10[sup -16] cm[sup 2] W[sup -1], respectively, using 35 ps pulses by the z-scan technique. The two-photon absorption (TPA) coefficient β at 532 nm is 0.29 cm GW[sup -1]. Furthermore, we examine the behavior of self-focusing and nonlinear lens inside a laser resonator and discuss its influence on laser performance. © 2003 American Institute of Physics.


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