scholarly journals Low-threshold power and tunable integrated optical limiter based on an ultracompact VO2/Si waveguide

APL Photonics ◽  
2021 ◽  
Author(s):  
Jorge Parra ◽  
Juan Navarro ◽  
Mariela Menghini ◽  
Maria Recaman ◽  
Jean-Pierre Locquet ◽  
...  
Keyword(s):  
Threshold Power ◽  
Optical Limiter ◽  
Integrated Optical ◽  
Low Threshold

Electro-Optic Power Limiter: Broadband, Self-Actuating Optical Limiter for Visible and Infrared Radiation

1994 ◽  
Vol 374 ◽  
Author(s):  
Tallis Y. Chang ◽  
Ian McMichael ◽  
John H. Hong ◽  
Monte Khoshnevisan
Keyword(s):  
Wavelength Range ◽  
Infrared Radiation ◽  
Nonlinear Optical ◽  
Optical Power ◽  
Threshold Power ◽  
Near Ir ◽  
Electro Optic ◽  
Optical Limiter ◽  
Low Threshold ◽  
Unique Capability

AbstractWe present studies of an optical power limiter that uses a combination of the photoconductive and linear electro-optic effects. The electro-optic power limiter (EOPL), first demonstrated using CdTe in the near IR, possesses many desirable qualities including broadband wavelength responsivity, self-actuation, and low threshold power. One unique capability of EOPL, not found in any other nonlinear optical power limiter, is the fact that any light - coherent or incoherent - can be used. Our studies in CdTe, GaAs, and BSO crystals resulted in extending the wavelength range from the visible to MWIR wavelengths.

The sensitization of laser-induced heat of Er3+ doped Y2O3 nanocrystals by codoped with Mn2+

2015 ◽  
Vol 29 (22) ◽  
pp. 1550158
Author(s):  
Yunfeng Bai ◽  
Minjie Luan ◽  
Linjun Li ◽  
Zhelong He ◽  
Dongyu Li
Keyword(s):  
Power Density ◽  
Thermal Emission ◽  
Energy Levels ◽  
Excitation Power ◽  
Threshold Power ◽  
Excitation Power Density ◽  
Ir Laser ◽  
Order Of Magnitude ◽  
Low Threshold ◽  
Density Threshold

Low threshold power density cw laser-induced heat has been observed in [Formula: see text] and [Formula: see text] codoped [Formula: see text] nanocrystals under excitation by a 980 nm IR laser. Codoped [Formula: see text] remarkably reduces the power density threshold of laser-induced heat compared with [Formula: see text] doped [Formula: see text] nanocrystals. When the excitation power density exceed [Formula: see text], [Formula: see text] codoped [Formula: see text] nanocrystals emit strong blackbody radiation. The thermal emission of [Formula: see text] should originate from the multiphonon relaxation between neighboring energy levels. One additional UC-PL enhancement is observed. The UC-PL intensity can be enhanced by an order of magnitude through high temperature calcination caused by light into heat.

scholarly journals Ultra-low threshold lasing through phase front engineering via a metallic circular aperture

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Zhixin Wang ◽  
Filippos Kapsalidis ◽  
Ruijun Wang ◽  
Mattias Beck ◽  
Jérôme Faist
Keyword(s):  
Semiconductor Lasers ◽  
Continuous Wave ◽  
Threshold Power ◽  
Circular Aperture ◽  
Phase Front ◽  
Reflective Coating ◽  
Low Threshold ◽  
Ridge Lasers ◽  
Reflective Coatings ◽  
Electrical Consumption

AbstractSemiconductor lasers with extremely low threshold power require a combination of small volume active region with high-quality-factor cavities. For ridge lasers with highly reflective coatings, an ultra-low threshold demands significantly suppressing the diffraction loss at the facets of the laser. Here, we demonstrate that introducing a subwavelength aperture in the metallic highly reflective coating of a laser can correct the phase front, thereby counter-intuitively enhancing both its modal reflectivity and transmissivity at the same time. Theoretical and experimental results manifest a decreasing in the mirror loss by over 40% and an increasing in the transmissivity by 104. Implementing this method on a small-cavity quantum cascade laser, room-temperature continuous-wave lasing operation at 4.5 μm wavelength with an electrical consumption power of only 143 mW is achieved. Our work suggests possibilities for future portable applications and can be implemented in a broad range of optoelectronic systems.

Soft-solution route to ZnO nanowall array with low threshold power density

2010 ◽  
Vol 97 (4) ◽  
pp. 043109 ◽  
Author(s):  
Eue-Soon Jang ◽  
Xiaoyuan Chen ◽  
Jung-Hee Won ◽  
Jae-Hun Chung ◽  
Du-Jeon Jang ◽  
...  
Keyword(s):  
Power Density ◽  
Threshold Power ◽  
Low Threshold ◽  
Solution Route

scholarly journals Bidirectional-pumped tunable fiber laser using a voltage-controlled Fabry-Perot Etalon filter

2017 ◽  
Vol 13 (3) ◽  
Author(s):  
Anir Syazwan Sharbirin ◽  
Muhamad Zharif Samion ◽  
Aisah Muhamad ◽  
Mohammad Faizal Ismail ◽  
Harith Ahmad
Keyword(s):  
Fiber Laser ◽  
Exponential Growth ◽  
Tuning Range ◽  
Threshold Power ◽  
Electronic Control ◽  
Simple Construction ◽  
Narrow Bandwidth ◽  
Fabry Perot ◽  
Low Threshold ◽  
Tunable Fiber Laser

Fabry-Perot based filters have long been an attractive interferometric device due to its simple construction and versatility for various applications. In this paper, we demonstrate a bidirectional-pumped tunable Thulium-doped Fiber Laser (TDFL) using a voltage-controlled Fabry-Perot Etalon (FPE) filter. The filter allows a maximum tuning range of ~42.0 nm, from 1965.40 nm, up to 2007.35 nm. The generated laser also exhibits a relatively low threshold power of ~62.57 mW and narrow bandwidth of ~0.16 nm. The tuning capability exhibits an exponential growth relationship which can be exploited for precise automatic electronic control.

scholarly journals Plasmonic switch Based on asymmetric cavities with embedding square of gold inside the cavities

2021 ◽  
Author(s):  
Majid Ghadrdan ◽  
Mojtaba Shahraki ◽  
Mohammad Ali Mansouri-Birjandi
Keyword(s):  
Transmission Spectrum ◽  
Threshold Power ◽  
Metal Insulator ◽  
Low Input ◽  
Nonlinear Properties ◽  
Plasmonic Switch ◽  
Metal Insulator Metal ◽  
All Optical ◽  
Gold Nanostructure ◽  
Low Threshold

Abstract In this paper, we proposed an all-optical plasmonic switch based on metal-insulator-metal (MIM) structures. We used the intrinsic nonlinear properties of gold to implement the switch. The proposed switch consists of a bus waveguide side coupled with a pair of asymmetric vertical cavities. We obtained the transmission spectrum of the structure for low input intensities. The results showed that a sharp dip occurs at the wavelength of 860 nm. Due to the nonlinear properties of gold and the nonlinear Kerr effects, the proposed switch has a high transmission ratio of about 0.8 and a low threshold power of 0.07 mW/µm2. The threshold power of the structure with and without using the gold nanostructure shows a reduction of 50%. The result showed that the proposed switch has the potentiality to be applied in the plasmonic integration circuits.

A novel, highly-strained structure with an integrated optical cavity for a low threshold germanium laser

CLEO: 2015 ◽  
2015 ◽  
Author(s):  
Shashank Gupta ◽  
Donguk Nam ◽  
Jan Petykiewicz ◽  
David Sukhdeo ◽  
Jelena Vuckovic ◽  
...  
Keyword(s):  
Optical Cavity ◽  
Integrated Optical ◽  
Low Threshold ◽  
Germanium Laser ◽  
Highly Strained
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