Annular beam with segmented phase gradients
نویسندگان
چکیده
منابع مشابه
Gouy phase shift for annular beam profiles in attosecond experiments.
Attosecond pump-probe measurements are typically performed by combining attosecond pulses with more intense femtosecond, phase-locked infrared (IR) pulses because of the low average photon flux of attosecond light sources based on high-harmonic generation (HHG). Furthermore, the strong absorption of materials at the extreme ultraviolet (XUV) wavelengths of the attosecond pulses typically preven...
متن کاملPartially Coherent, Radially Polarized Beam with Annular Apodization
Based on the vectorial Debye theory, the tight focusing properties of partially coherent, radially polarized vortex beams are investigated in detail. In this paper, we propose to use an amplitude modulated filter in combination with a high NA lens to generate long focal depth in the focal region. Numerical results show that the generation of long focal depth of FWHM (22.08λ) is achieved, which ...
متن کاملHigh-order harmonic generation with an annular laser beam.
High-order harmonics have been generated by the use of an annular laser beam. The nonlinearity of harmonic production and the shorter wavelengths involved cause the harmonics to emerge strongly peaked on the laser axis. Thus the harmonics emerge from the focus inside the missing portion of the laser beam. This permits the laser to be blocked by an aperture that passes the harmonics.
متن کاملAnnular Groove Phase Mask Coronagraph
We present a new phase mask coronagraph consisting in an optical vortex induced by a space-variant surface relief subwavelength grating. Phase mask coronagraphy is a recent technique aiming at accommodating both high dynamic and high angular resolution imaging of faint sources around bright objects such as exoplanets orbiting their parent stars or host galaxies of active galactic nuclei. Subwav...
متن کاملMitral annular calcification as a cause of mitral valve gradients.
BACKGROUND Mitral annular calcification (MAC) is common, particularly in the elderly. While thought to occasionally produce significant mitral regurgitation, it is considered a rare cause of mitral stenosis. METHODS Echocardiogram reports from general cardiology outpatients were searched for phrases regarding severe MAC and, separately, for mitral stenosis. Rheumatic disease or other mitral v...
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: AIP Advances
سال: 2016
ISSN: 2158-3226
DOI: 10.1063/1.4962301