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Using the Z-scan technique with an 800-nm 28 femtosecond laser running at 82-MHz, we verify thermal lensing effect accumulated across pulses in a transparent (both linear and nonlinear) liquid: methanol.
A negative lensing effect is observed in transparent liquids C2H4Cl2 and C2H4Br2 using the Z-scan technique and 28 femtosecond titanium: sapphire laser pulses. Two possible mechanisms, Raman induced Kerr effect and thermal lensing effect, are invoked to account for the sign change of nonlinear refraction.
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