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Article
Using Frequency Resolved Optical Gating for Optimization of Thermal Lensing Compensated Ti:Sapphire Femtosecond Laser System

Authors: Mukhtar Hussain --- Tayyab Imran
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2015 Volume: 11 Issue: 3 Pages: 9-12
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

We report the characterization and optimization of thermal lensing compensated high peak power Ti:Sapphire femtosecond laser system, 4.0mJ pulse energy operating at 1-kHz repetition rate. Thermal lensing is compensated by employing convex folding mirrors and Peltier coolers while thermal eigenmode post-amplifier has introduced to retain the amplified laser pulse beam on the amplifier crystal. Single-shot second harmonic generation (SHG) frequency-resolved optical gating (FROG) diagnostic technique is employed to characterize the output compressed laser pulses. FROG image is monitored by charged-couple device (CCD) attached to the personal computer and optimization of the laser system is observed by FROG image in real time. Grating detuning is carried out in the compressor to optimize the minimum possible pulse duration and pulse of 30 fs duration is measured at the zero detuning scale.


Article
Optimization and Fine-Tuning of Controlled White-Light Continuum Generation in Transparent Solid Medium by 1-kHz Repetition Rate Femtosecond Laser Pulses

Authors: Tayyab Imran --- Mukhtar Hussain
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2016 Volume: 12 Issue: 1 Pages: 27-30
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

We report on the generation and optimization of the well-controlled white-light continuum in 1-mm thick sapphire plate by 1-kHz repetition rate 30 fs laser pulses. The white-light continuum generation observed and investigated by using general purpose digital camera and broadband spectrometer. We controlled the incident seed beam power by neutral density filter, variable iris, and focusing lens. Further, we employed two collimating parabolic mirrors and a variable iris to control the collimation of a white-light continuum extended from 400 nm to 1100 nm. The incident seed beam energy and focal position within the optical medium are found critical to stabilizing and controlling the white-light continuum generation. We have investigated and observed the blue-shift in white-light continuum generation at lower incident seed beam power and multi-filamentation at the higher power of the incident beam. The white-light continuum triggering and initializing processes are discussed and reviewed briefly. We have also fine-tuned the white-light continuum generation spectrum by changing the grating separation in the compressor.


Article
Optimization and Fine-Tuning of Controlled White-Light Continuum Generation in Transparent Solid Medium by 1-kHz Repetition Rate Femtosecond Laser Pulses
أمثلية والتنغيم الدقيق للتوليد المستمر المحكوم للضوء الأبيض في الوسط الصلب الشفاف

Authors: Tayyab Imran --- Mukhtar Hussain
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2017 Volume: 13 Issue: 1 Pages: 27-30
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

We report on the generation and optimization of the well-controlled white-light continuum in 1-mm thick sapphire plate by 1-kHz repetition rate 30 fs laser pulses. The white-light continuum generation observed and investigated by using general purpose digital camera and broadband spectrometer. We controlled the incident seed beam power by neutral density filter, variable iris, and focusing lens. Further, we employed two collimating parabolic mirrors and a variable iris to control the collimation of a white-light continuum extended from 400 nm to 1100 nm. The incident seed beam energy and focal position within the optical medium are found critical to stabilizing and controlling the white-light continuum generation. We have investigated and observed the blue-shift in white-light continuum generation at lower incident seed beam power and multi-filamentation at the higher power of the incident beam. The white-light continuum triggering and initializing processes are discussed and reviewed briefly. We have also fine-tuned the white-light continuum generation spectrum by changing the grating separation in the compressor.

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