Characterization of laser – induced plasmas by atomic emission spectroscopy

Diagnostics of Laser-Induced Plasmas by Mass Spectrometry and Optical Emission Spectroscopy

Diagnostics of Laser Plasmas by THz-Spectroscopy

We probe the electron dynamics in laser excited, gaseous plasmas by ultrashort pulses of broadband THz radiation as shown in Fig. 1. The plasma is created by an 800 nm, 0.6 mJ, 20 fs pulse from an amplified Ti:sapphire laser. Targets are samples of different gases, such as Ar, Ne, O2, H2, SF6 or Ar-SF6 mixtures, under ambient pressure which become up to 10% ionized. The probing THz pulse is obt...

control of the optical properties of nanoparticles by laser fields

در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...

Hydrogen Balmer Series Spectroscopy in Laser-induced Breakdown Plasmas

A review is presented of recent experiments and diagnostics based on Stark broadening of hydrogen Balmer lines in laser-induced optical breakdown plasmas. Experiments primarily utilize pulsed Nd:YAG laser radiation at 1064-nm and nominal 10 nanosecond pulse duration. Analysis of Stark broadening and shifts in the measured H-alpha spectra, combined with Boltzmann plots from H-alpha, H-beta and H...

Characterization of malignant tissue cells by laser-induced breakdown spectroscopy.

Cancer diagnosis and classification is extremely complicated and, for the most part, relies on subjective interpretation of biopsy material. Such methods are laborious and in some cases might result in different results depending on the histopathologist doing the examination. Automated, real-time diagnostic procedures would greatly facilitate cancer diagnosis and classification. Laser-induced b...