Nonlinear Optical Properties of CuS Nanocrystals with Modified Surface

1995 ◽  
Vol 405 ◽  
Author(s):  
K. V. Yumashev ◽  
V. P. Mikhailov ◽  
A. M. Malyarevich ◽  
P. V. Prokoshin ◽  
V. S. Gurin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Femtosecond Lasers ◽  
Relaxation Times ◽  
Surface Oxidation ◽  
Bleaching Effect ◽  
Energy Level Scheme ◽  
Saturable Absorbers ◽  
Modified Surface ◽  
Oxidation Surface

AbstractNonlinear bleaching and induced absorption effects in CuS microcrystals with modified (after oxidation) surface have been studied. Relaxation times of these processes demonstrate two components - fast (˜ 80 ps) and slow (>>500 ps). Energy level scheme for explanation of these phenomena was proposed. Appearance of bleaching effect in CuS microcrystals due to surface oxidation makes them as perspective materials for saturable absorbers for pico- and femtosecond lasers.

Four-wave mixing signal intensity: Relaxation time effects on the absorptive and dispersive optical properties in a two-level system

2015 ◽  
Vol 24 (02) ◽  
pp. 1550023
Author(s):  
J. L. Paz ◽  
Luis G. Rodríguez ◽  
Cesar Costa-Vera
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Dipole Moments ◽  
Relaxation Times ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Level System ◽  
Time Effects ◽  
Frequency Space ◽  
Signal Response

A study of the effects of relaxation times on the Four-Wave Mixing (FWM) signal response in frequency space for a two-level system is presented where the collisional effects of the solvent and the presence of the electromagnetic field are considered. The model is a generalization of the conventional two-level approach in that it includes a simplified description of the molecular structure associated with the non-zero permanent dipole moments. Significant changes in both the FWM-intensity and nonlinear optical properties are observed, due mainly to changes in the ratio between the longitudinal and transversal relaxation times.

scholarly journals Carbon nanotube mode-locked fiber lasers: recent progress and perspectives

Nanophotonics ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 749-775
Author(s):  
Lilong Dai ◽  
Zinan Huang ◽  
Qianqian Huang ◽  
Chang Zhao ◽  
Aleksey Rozhin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Optical Properties ◽  
Fiber Lasers ◽  
Nonlinear Optical ◽  
Recent Progress ◽  
State Of The Art ◽  
Mode Locking ◽  
Optical Pulses ◽  
Saturable Absorbers ◽  
Ultrashort Optical Pulses

AbstractCarbon nanotubes (CNTs) possess remarkable nonlinear optical properties; a particular application is to function as a mode locker used in ultrafast fiber lasers to produce ultrashort optical pulses. Various types of CNT saturable absorbers (SAs) and ultrafast fiber lasers have been demonstrated. In this review, typical fabrication process and development of CNT SAs are discussed and we highlight the recent investigation and progress of state-of-the-art ultrafast fiber lasers covering GHz, bidirectional ultrafast fiber lasers, vectorial mode fiber lasers, comb systems, and mode-locking dynamics. Our perspectives of ultrafast fiber lasers based on CNT SAs are given finally.

Relaxation times and symmetries in the nonlinear optical properties of a two-level system

2017 ◽  
Vol 405 ◽  
pp. 238-243 ◽  
Author(s):  
J.L. Paz ◽  
J.R. León-Torres ◽  
Luis Lascano ◽  
César Costa Vera
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Relaxation Times ◽  
Nonlinear Optical Properties ◽  
Level System

Non-Linear Optical Response of Metallic and Emiconducting Nanocrystals in Fused Silica

1996 ◽  
Vol 438 ◽  
Author(s):  
R. G. Elliman ◽  
B. Luther-Davies ◽  
M. Samoc ◽  
A. Dowd
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Response Times ◽  
Relaxation Times ◽  
Optical Response ◽  
Fused Silica ◽  
Nonlinear Optical Properties ◽  
Fast Relaxation ◽  
Non Linear ◽  
Linear And Nonlinear

AbstractThe linear and nonlinear optical properties of Ge-implanted fused-silica were examined and compared with Au- and Si-implanted samples. Samples as-implanted with 1.0 MeV Ge ions to a fluence of 3x1017 Ge.cm-2 exhibited relatively large non-linearities, |n2| ≤5x10-12 cm2/W, and fast relaxation times, ∼lps. In contrast, samples implanted with comparable fluences of Au ions exhibited smaller non-linearities, |n2| ∼1x10-13 cm2/W, and slower response times, ≥ 10ps. The non-linearity for Ge was much larger than that for samples as-implanted with Si.

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