scholarly journals Исследование шумовых характеристик вертикально-излучающих лазеров с ромбовидной токовой апертурой для применения в компактном квантовом цезиевом магнитометре

2021 ◽  
Vol 47 (24) ◽  
pp. 3
Author(s):  
М.А. Бобров ◽  
С.А. Блохин ◽  
Н.А. Малеев ◽  
А.Г. Кузьменков ◽  
А.А. Блохин ◽  
...  
Keyword(s):  
Optical Power ◽  
Zero Magnetic Field ◽  
Narrow Linewidth ◽  
Frequency Range ◽  
Optically Pumped ◽  
Vapor Cell ◽  
Output Optical Power ◽  
Amplitude Noise ◽  
Ultimate Sensitivity ◽  
Emitting Lasers

The possibility of using vertical-emitting lasers with intracavity contacts (IC-VCSEL) and a rhomboidal oxide current aperture for creating a non-zero magnetic field optically pumped atomic magnetometers (OPM) with a 133Cs vapor cell for magnetoencephalographic (MEG) systems were demonstrated. Relative intensity noise (RIN) and polarization resolved RIN of the IC-VCSEL in the 895 nm range with different mirror losses (linewidth) in the frequency range from 1 Hz to 100 kHz were experimentally investigated. Lasers with low mirror loss (narrow linewidth) have polarization resolved RIN comparable to amplitude noise. For IC-VCSEL with an output optical power of 0.8 mW and a linewidth of 55 MHz, the noise level measured is 148 dB/Hz in 1 Hz bandwidth at 40 kHz frequency. The ultimate sensitivity of OPM based on two-beam MX scheme with studied VCSELs was estimated as ~ 11 fT/√Hz.

scholarly journals Influence of Pumping Beam Width on Vecsel Output Power

2014 ◽  
Vol 60 (3) ◽  
pp. 239-245 ◽  
Author(s):  
Adam K. Sokoł ◽  
Robert P. Sarzała
Keyword(s):  
Thermal Properties ◽  
Output Power ◽  
Laser Power ◽  
External Cavity ◽  
Beam Width ◽  
Cavity Surface ◽  
Beam Diameter ◽  
Optically Pumped ◽  
Surface Emitting Lasers ◽  
Emitting Lasers

Abstract The paper is devoted to a numerical analysis of an influence of a pumping beam diameter on output power of optically pumped vertical-external-cavity surface-emitting lasers. Simulations have been carried out for a structure with a GaInNAs/GaAs active region operating at 1.32 urn. Various assembly configurations have been considered. Results obtained show that laser power scaling is strongly affected by thermal properties of the device.

scholarly journals EDFA AND EYCDFA POWER BOOSTER FOR SECURED, HIGH SPEED AND MULTIPLE WAVELENGTH SERVICES IN OPTICAL COMMUNICATION SYSTEMS USING WDM AND QUAD-SINGLE FORWARD AND TRI BACKWARD PUMPING TECHNIQUE

2021 ◽  
Vol 5 (12) ◽  
Author(s):  
S. Semmalar ◽  
S. Malarkkan
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
Communication Systems ◽  
High Speed ◽  
Optical Power ◽  
Fiber Amplifier ◽  
Signal Power ◽  
Erbium Doped Fiber Amplifier ◽  
Output Optical Power ◽  
Wavelength Division

Proposed the EDFA and EYCDFA power booster (Erbium Doped Fiber Amplifier- Erbium ytterbium co doped fiber amplifier) with quad pumping for high speed and multi wavelength services in an optical communication. The proposed EDFA and EYCDFA power booster with WDM(Wavelength division multiplexing) simulated by dual forward and Backward pumping, Dual-backward pumping, Tri-single forward and dual backward pumping and Quadsingle forward and tri-backward pumping with respect to Pump power and fiber Length. The parameters Input Optical power, Output Optical power, Forward Signal power, Backward Signal power measured and determined the speed of transmission in all types of pumping methods. From that the proposed EDFA- ans EYCDFA power booster with WDM quad pumping is the best suitable for secured high speed optical telecommunication systems. The results shown in Quad pumping Output optical power is maximum 25.2dB and optimum spectral forward Signal power is 30.5dBm and very less spectral optical backward signal power of -25.4dBm with Length 5m

scholarly journals Brownian motion-induced amplitude noise in vapor-cell frequency standards

2020 ◽  
Vol 22 (8) ◽  
pp. 083050
Author(s):  
S Micalizio ◽  
A Godone ◽  
M Gozzelino ◽  
F Levi
Keyword(s):  
Brownian Motion ◽  
Cell Frequency ◽  
Vapor Cell ◽  
Amplitude Noise ◽  
Frequency Standards

scholarly journals Practice and perspectives of using ultrasensitive magnetometers in biomedical research.

2021 ◽  
Author(s):  
Yu.V. Maslennikov ◽  
◽  
◽  
Keyword(s):  
Magnetic Field ◽  
Biomedical Research ◽  
Magnetic Measurements ◽  
Signal To Noise Ratio ◽  
Frequency Range ◽  
Optically Pumped ◽  
Technical Solutions ◽  
Further Development ◽  
The Magnetic Field

There are a large number of sensors for measuring the magnetic field of biological objects. They are characterized by the type of the measured physical parameter (magnetic field strength, magnetic flux, etc.), the level of intrinsic sensitivity, and the frequency range of the recorded signals. The long-term practice of studying biomagnetic signals shows that only SQUID-based magnetometers and optically pumped magnetometers have sensitivity levels sufficient for recording biomagnetic signals with the required signal-to-noise ratio. This chapter reflects the main directions of using such magnetometers and methods of magnetic measurements in biomedical research, gives examples of existing technical solutions, and shows possible ways of their further development.

scholarly journals Characterization of Optically-Reconfigurable Metasurfaces by a Free Space Microwave Bistatic Technique

2020 ◽  
Vol 10 (12) ◽  
pp. 4353
Author(s):  
Houssemeddine Krraoui ◽  
Charlotte Tripon-Canseliet ◽  
Ivan Maksimovic ◽  
Stefan Varault ◽  
Gregoire Pillet ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Power ◽  
Frequency Selective Surface ◽  
Infrared Region ◽  
Photon Absorption ◽  
60 Ghz ◽  
Frequency Range ◽  
Specific Incident ◽  
Absorption Phenomenon

Microwave performance extraction of optically-controlled squared frequency-selective surface (FSS) structures printed on highly resistive (HR) silicon substrate are presented, from a innovative bistatic microwave photonic characterization technique operating in the 40 to 60 GHz frequency range, commonly used for radar cross section (RCS) measurements. According to typical physical photon absorption phenomenon occurring in photoconductive materials, these structures demonstrate experimentally a bandpass filtering frequency response cancellation through reflection coefficient measurements, under specific incident collective illumination in the Near-infrared region (NIR). This behaviour is attributed to their microwave surface impedance modification accordingly to the incident optical power, allowing ultrafast reconfigurability of such devices by optics

scholarly journals Narrow linewidth operation of a tunable optically pumped semiconductor laser

2004 ◽  
Vol 12 (22) ◽  
pp. 5434 ◽  
Author(s):  
Richard H. Abram ◽  
Kyle S. Gardner ◽  
Erling Riis ◽  
Allister I. Ferguson
Keyword(s):  
Semiconductor Laser ◽  
Narrow Linewidth ◽  
Optically Pumped

Optical Power Optimization of the Single Mode Vertical Cavity Surface Emitting Lasers by Two Oxide Layers

2011 ◽  
Vol 383-390 ◽  
pp. 6283-6288 ◽  
Author(s):  
Mohamad Yazdanypoor ◽  
Asghar Gholami
Keyword(s):  
Output Power ◽  
Optical Power ◽  
Single Mode ◽  
Threshold Current ◽  
Cavity Surface ◽  
Oxide Layers ◽  
High Frequency Response ◽  
Vertical Cavity Surface ◽  
Emitting Lasers ◽  
Vertical Cavity

Influence of using two oxide layers in the both sides of active layer with different position and aperture size on Vertical Cavity Surface Emitting Laser (VCSEL) performance is analyzed showing effects on the output power, single mode operation and threshold current. In addition, for improving speed we use ion implant area along with thick oxide layer to minimize parasitic elements. As the result, the proposed design exhibits much better stability of the fundamental mode over a wider current range, much higher output power, lower threshold current, than the conventional one with a high frequency response.

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