Impulsive rotational Raman scattering of N_2 by a remote “air laser” in femtosecond laser filament
نویسندگان
چکیده
منابع مشابه
Surface-enhanced Raman scattering microchip fabricated by femtosecond laser.
We report a surface-enhanced Raman scattering (SERS) microchip that is capable of measuring SERS signals of liquid samples with high sensitivity. The microdevice is an integration of a silicon-based SERS substrate, a multimode optical fiber (MMF), and a microchannel embedded in the photosensitive glass fabricated by the femtosecond laser followed by thermal treatment, wet etching, and annealing...
متن کاملDirect Measurement of Laser Fluence of Femtosecond Laser Filament in Air
Laser filaments appear spontaneously during the propagation of intense ultrashort laser pulses with a power exceeding a critical value Pcr (Pcr = 5 GW at 800 nm in air) [1]. The intense beam tends to collapse due to the optical Kerr self-focusing effect until the intensity is high enough to ionize the medium, giving rise to a defocusing plasma. Thereafter, a dynamic competition between these tw...
متن کاملSimple method of measuring laser peak intensity inside femtosecond laser filament in air.
Measurement of laser intensity inside a femtosecond laser filament is a challenging task. In this work, we suggest a simple way to characterize laser peak intensity inside the filament in air. It is based on the signal ratio measurement of two nitrogen fluorescence lines, namely, 391 nm and 337 nm. Because of distinct excitation mechanisms, the signals of the two fluorescence lines increase wit...
متن کاملcontrol 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...
15 صفحه اولFemtosecond Laser Filamentation in Air
Femtosecond laser filamentation was excited in air. Measurement of the length of the light filament formed was carried out, using calibration method with an analysis on the precision of the measurement. From the photoemission spectra obtained by optic spectrometer, valuable information on the mechanism of interaction of strong laser pulses with atoms and molecules could be obtained. Furthermore...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Optics Letters
سال: 2014
ISSN: 0146-9592,1539-4794
DOI: 10.1364/ol.39.002250