首页|Optical nonlinearities of mercury telluride quantum dots measured by nanosecond pulses
Optical nonlinearities of mercury telluride quantum dots measured by nanosecond pulses
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NSTL
Elsevier
We synthesized the colloidal mercury telluride quantum dots (QDs) and analyzed their low-order nonlinear optical properties using 1064 nm and 532 nm, 10 ns pulses. HgTe QDs colloidal suspension showed the strong saturable absorption and negative nonlinear refraction (saturation intensity I-SA = 5 x10(8)W cm(-2), nonlinear absorption coefficients attributed to saturable absorption and reverse saturable absorption beta(SA) =-4 x10(-9)cm W-1 and beta(RSA) = 1 x10-8 cm W-1, nonlinear refractive index gamma =-6 x10(-13) cm(2) W-1) while using the 532 nm probe pulses. The nonlinear optical parameters of this suspension at 1064 nm were smaller (nonlinear absorption coefficient attributed to the two-photon absorption beta(2PA) = 6 x10(-10) cm W-1, gamma =-5 x10(-14) cm(2) W-1). The negative nonlinear refraction of HgTe QDs was attributed to the thermal and Kerr effects in the case of 532 nm and 1064 nm probe pulses, respectively.
NSTL
Elsevier
