15 Questions 77 Answers 0 Followers
Questions related from Nguyễn Thanh Lâm
Dear professors and colleagues, I am going to to study effect of the two photons absorption in Safranin O. Safranin O is organic material, so I think that the power needed to activate this effect...
24 January 2020 736 9 View
Dear colleagues, We are conducting experiments on battery-magnet systems running in copper tube (also known as World's Simplest Electric Train). Our equipments includes: -A pin size AAA...
13 September 2018 403 4 View
Dear colleagues, Without nonlinear absorption, the Z-scan curve corresponding to the pure nonlinear refraction will be symmetric around the origin O. The nonlinear absorption will lead to...
07 February 2018 4,490 10 View
Dear colleagues, The Z-scan technique is proposed by Sheik-Bahae et al [1]. Theoretically, when there is no nonlinear absorption, the Z-scan curve must be symmetric around the origin of the...
03 February 2018 3,385 4 View
Dear colleagues, I have used LBP-1-USB Laser Beam Profiler, Newport. This device can measure two-dimensional and three-dimensional beam profiles as well as measure the beam radius very well. The...
27 October 2017 3,219 3 View
Dear Colleagues, I'm studying the optical limiting effect in organic material due to reverse saturation absorption. As we know, in reverse saturation absorption, the transmission coefficient...
23 September 2017 1,296 4 View
Dear Colleagues, I'm studying self-defocusing effect in organic material. In the light beam on the screen, I observe the rings like attached images. Is this the result of diffraction? What is the...
21 September 2017 6,372 18 View
Dear Colleagues, From relation: P=ε_0 χ^((1)) E I suppose that in an isotropic medium, χ^((1)) is the scalar quantity, vector P and E are in the same direction, while for an anisotropic medium,...
18 September 2017 5,235 4 View
Dear Colleagues, I am studying a third order nonlinear optical organic material with a negative nonlinear refractive index, but the total refractive index is positive (n=n0+n2I, n2
18 September 2017 4,599 2 View
Dear Colleagues,I'm investigating third-order nonlinear optical effects in dyes such as Acid Blue 29, Oil Red O, ect. To exploit the applications of these materials, we have to convert them into...
11 September 2017 7,391 2 View
In Z-scan technique, we often use motor (digital mcrometer transformer) to move sample. I think that motor is ued to automate measurement. If there is no motor, for example, we can move sample...
03 September 2017 2,654 13 View
Dear colleagues, As far as I know, reverse saturation absorption is one of the mechanisms of optical limiting effect. Because when the light intensity is strong, the absorption coefficient...
20 August 2017 2,173 11 View
Dear colleagues, I have read many papers on Z-Scan measurements of material, I see that the error is in the range of 25 to 40%. Some authors claim that the error is up to 50%. And the...
31 July 2017 9,777 26 View
Dear Colleagues, It was showed that conversion efficiency of second harmonic generation or third harmonic generation depends on the square of crystal length L ^ 2. So, does the nonlinear...
03 January 2016 6,697 18 View
Dear Professors, Can you please send me your paper entitled " A Quantitative Study of the Laser-Induced Ring Pattern and optical limiting From 4-Chloro-3-methoxynitrobenzene solution" Thank you in...
01 January 1970 2,429 1 View
