Title :
Frequency modulation optimization of nonlinear optical Z-scan by high repetition rate femtosecond laser
Author :
Abidin, M.S.Z. ; Noor, A.S.M. ; Mahdi, M.A. ; Rashid, Shaufiq Abd
Author_Institution :
Dept. of Comput. & Commun. Eng., Univ. Putra Malaysia, Serdang, Malaysia
Abstract :
Nonlinear optical properties of 2- (2-hydroxyethyl)-6-(morpholin-4-yl) -1H-benzo[de]isoquinoline- 1,3(2H)- dione pigment material is investigated with frequency modulation of 250 MHz femtosecond high repetition rate (HRR) laser by an optical chopper. Thermal lensing formation on the material due to thermal build up from HRR laser leads to measurement ambiguity of nonlinear refractive index (NLRI) and two-photon absorption cross section (TPACS). Optimized optical chopper frequency range of 50% duty cycle modulated laser beam effectively reduces laser contact time on the material and resulted in improved NLRI and TPACS of -8.23 × 10-18 m2/W and 2.96 GM respectively.
Keywords :
frequency modulation; high-speed optical techniques; laser beams; optical elements; optical materials; optical modulation; organic compounds; refractive index; thermal lensing; 2-(2-hydroxyethyl)-6-(morpholin-4-yl) -1H-benzo[de]isoquinoline- 1,3(2H)- dione; NLRI; TPACS; duty cycle modulated laser beam; frequency 250 MHz; frequency modulation optimization; high repetition rate femtosecond laser; measurement ambiguity; nonlinear optical Z-scan; nonlinear optical properties; nonlinear refractive index; optical chopper; pigment material; thermal lensing formation; two-photon absorption cross section; Apertures; IP networks; Laser modes; Optical modulation; Power lasers; Ultrafast electronics; Ultrafast optics; Nonlinear refractive index; Thermal lensing; Two-photon absorption cross-section; Z-scan;
Conference_Titel :
Photonics (ICP), 2013 IEEE 4th International Conference on
Conference_Location :
Melaka
Print_ISBN :
978-1-4673-6073-9
DOI :
10.1109/ICP.2013.6687077
