Diagnostics of liquid-phase laser ablation plasmas by spectroscopic methods

Diagnostics of silicon plasmas produced by visible nanosecond laser ablation

Ž . The second harmonic of a pulsed Nd:YAG laser 532 nm has been used for the ablation of silicon samples in air at atmospheric pressure. In order to study the interaction for silicon targets, the laser-induced plasma characteristics were examined in detail with the use of a spaceand time-resolved technique. Electron temperatures, ionic temperatures and electron number densities were determined...

Liquid-Phase Pulsed Laser Ablation

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...

Diagnostics of laser-produced plasmas

Laser-produced plasmas are used for a variety of studies, relevant for both basic physics and applications, and are of course essential within the study of inertial confi nement approach to nuclear fusion. Because of this large interest, a large variety of diagnostics have been developed and are routinely used to unveil the physical processes at work during plasma process and laser-plasma inter...

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...