Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Ali Roohforouz"'
Autor:
Ali Roohforouz, Reza Eyni Chenar, Reza Rezaei-Nasirabad, Saeed Azizi, Kamran Hejaz, Ali Hamedani Golshan, Ali Abedinajafi, Vahid Vatani, Seyed Hassan Nabavi
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
Abstract To achieve a 3.02 kW Yb-doped fiber laser oscillator, the behavior of transverse mode instability (TMI) is experimentally studied in different pumping configurations; co, hybrid, counter, and bidirectional. A comparative analysis showed that
Externí odkaz:
https://doaj.org/article/3f17ab48bd0c4965b50e63825c4ed2a5
Publikováno v:
Results in Physics, Vol 39, Iss , Pp 105770- (2022)
The present work studied the scalability of phase change material (PCM) down to a single-digit nm with single wall metallic carbon nanotubes (SWCNT) electrodes. For this purpose, the low bias electron transport properties of Ge2Sb2Te5 (GST) are inves
Externí odkaz:
https://doaj.org/article/d2c85ec2b42540fab45897fb1c97b2d2
Autor:
Ali Roohforouz, Aliasghar Shokri
Publikováno v:
Results in Physics, Vol 16, Iss , Pp 102880- (2020)
We explore the performance improvement of ultra-scaled phase-change memory (PCM) device with graphene- Ge2Sb2Te5 (GST) heterostructure by means of first-principle simulations of electron transport. We compare the tunneling probability of single-barri
Externí odkaz:
https://doaj.org/article/022b8c8366c54ce4b4ef8d5b967e81da
Autor:
Ali Roohforouz, Aliasghar Shokri
Publikováno v:
AIP Advances, Vol 9, Iss 5, Pp 055120-055120-7 (2019)
The electron transport properties of ultra-scaled phase change material Ge2Sb2Te5 (GST) are investigated in a subthreshold bias range. We used ab-initio molecular dynamics (AIMD) and non-equilibrium Green’s function (NEGF) transport formalism based
Externí odkaz:
https://doaj.org/article/503ddfad3b4344f4ba7d66736e08459e
Autor:
Reza Rezaei-Nasirabad, Saeed Azizi, Danial Paygan, Mohammad Tavassoli, Ali Abedinajafi, Ali Roohforouz, Reza Eyni Chenar, Ali Hamedani Golshan, Kamran Hejaz, Vahid Vatani
Publikováno v:
SSRN Electronic Journal.
Autor:
Ali Roohforouz, Aliasghar Shokri
Publikováno v:
The European Physical Journal B. 92
In the present work, we have used ab initio molecular dynamics (AIMD) and non-equilibrium Green’s function (NEGF) formalism to investigate the scaling behavior of electron transport in ultra-thin films of Ge2Sb2Te5 (GST). The relation between the t
Autor:
K. Hejaz, Ali Roohforouz, Saeed Azizi, Vahid Vatani, Ali Abedi Najafi, Seyyed Hassan Nabavi, Reza Rezaee Nasir Abad, Reza Eyni Chenar
Publikováno v:
Laser Congress 2019 (ASSL, LAC, LS&C).
Transverse mode instability power threshold in a 3.02 kW fiber oscillator has been compared in co-, counter-, and bidirectional pumping schemes and results show that the threshold is higher in the bidirectional pumping configuration.
Autor:
Mahdi Shayganmanesh, Reza Rezaei-Nasirabad, Saeed Azizi, Ali Abedinajafi, K. Hejaz, Ali Roohforouz, Vahid Vatani
Publikováno v:
Applied optics. 57(21)
To enhance the transverse mode instability (TMI) threshold of a fiber oscillator, a novel configuration is presented. In this configuration the oscillator cavity length is considerably reduced and the remaining active fiber is released out of the cav
Autor:
Reza Poozesh, A. Amidian, R Rezaei Nasirabad, K. Hejaz, Ali Roohforouz, Ali Hamedani Golshan, A. Norouzy, A. Babazadeh, N. T. Jafari, A. Alavian, A Heidariazar
Publikováno v:
Journal of Lightwave Technology. 30:3199-3202
Fabrication techniques for the manufacture of a high power cladding light stripper are presented. Localized heating and thermal degradation of the recoating materials are the prime limiting factors for the operation of a high power cladding light str
Autor:
Reza Rezaei-Nasirabad, Mahdi Shayganmanesh, Ali Abedinajafi, Vahid Vatani, Saeed Azizi, K. Hejaz, Ali Roohforouz
Publikováno v:
Laser Physics Letters. 15:055102
Transverse mode instability (TMI) is experimentally investigated in a fiber oscillator and a fiber amplifier. For a reasonable comparison of TMI in these two configurations, the same optical components and design parameters are applied to both. Our e