Progress in Antimonide-Based Mid-IR Lasers

1999 ◽  
Vol 607 ◽  
Author(s):  
G.W. Turner ◽  
M.J. Manfra ◽  
H.K. Choi ◽  
A.K. Goyal ◽  
S.C. Buchter ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
High Performance ◽  
Optical Pumping ◽  
Beam Quality ◽  
Power Conversion ◽  
Active Regions ◽  
High Gain ◽  
Optically Pumped ◽  
Optical Pump ◽  
Peak Output Power

AbstractMid-infrared optically pumped semiconductor lasers (OPSLs) are presently being investigated for a variety of commercial and military applications. Active regions in such optically pumped lasers must meet the dual requirements of high gain and low loss at mid-IR wavelengths, combined with sufficient absorption of the optical pump at shorter wavelengths for efficient power conversion. In this paper we report the successful growth, fabrication, and characterization of high-performance OPSLs that employ novel active regions consisting of combinations of GalnAsSb integrated-absorber layers with type-II GaInSb/InAs quantum well regions. With 1.85-µm optical pumping at 85 K, OPSLs with such active regions have exhibited a peak output power of 2.1 W at 3.9 pm, improved beam quality, power conversion efficiency of ∼8%, and characteristic temperatures of ∼47 K.

scholarly journals High Sensitivity Optically Pumped Quantum Magnetometer

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Valentina Tiporlini ◽  
Kamal Alameh
Keyword(s):  
Magnetic Field ◽  
Pump Power ◽  
Optimal Design ◽  
Optical Pumping ◽  
High Sensitivity ◽  
Optically Pumped ◽  
Optical Pump ◽  
Operation Temperature ◽  
Quantum Magnetometer ◽  
Sinusoidal Magnetic Field

Quantum magnetometers based on optical pumping can achieve sensitivity as high as what SQUID-based devices can attain. In this paper, we discuss the principle of operation and the optimal design of an optically pumped quantum magnetometer. The ultimate intrinsic sensitivity is calculated showing that optimal performance of the magnetometer is attained with an optical pump power of 20 μW and an operation temperature of 48°C. Results show that the ultimate intrinsic sensitivity of the quantum magnetometer that can be achieved is 327 fT/Hz1/2over a bandwidth of 26 Hz and that this sensitivity drops to 130 pT/Hz1/2in the presence of environmental noise. The quantum magnetometer is shown to be capable of detecting a sinusoidal magnetic field of amplitude as low as 15 pT oscillating at 25 Hz.

scholarly journals Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 79 ◽  
Author(s):  
Tersilla Virgili ◽  
Marco Anni ◽  
Maria Luisa De Giorgi ◽  
Rocio Borrego Varillas ◽  
Benedetta M. Squeo ◽  
...  
Keyword(s):  
Cross Section ◽  
High Performance ◽  
Optical Gain ◽  
High Gain ◽  
Optically Pumped ◽  
Deep Blue ◽  
Light Amplification ◽  
Gain Cross Section ◽  
Low Threshold ◽  
Narrow Emission

The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10−16 cm2 which makes this molecule a good candidate for photonic applications. Amplified Spontaneous Emission measurements (ASE) under 150 fs and 3 ns pump pulses have revealed a narrow emission at 450 nm with a threshold of 5.5 μJcm−2 and 21 μJcm−2 respectively. Our results evidence that this new fluorene molecule is an interesting material for photonic applications, indeed the inclusion of TPA as a lateral substituent leads to a high gain and consequently to a low threshold blue organic ASE.

scholarly journals High performance tandem organic solar cells via a strongly infrared-absorbing narrow bandgap acceptor

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhenrong Jia ◽  
Shucheng Qin ◽  
Lei Meng ◽  
Qing Ma ◽  
Indunil Angunawela ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Organic Solar Cells ◽  
High Performance ◽  
Short Circuit ◽  
Power Conversion ◽  
High Power Conversion Efficiency ◽  
Device Structure ◽  
Narrow Bandgap

AbstractTandem organic solar cells are based on the device structure monolithically connecting two solar cells to broaden overall absorption spectrum and utilize the photon energy more efficiently. Herein, we demonstrate a simple strategy of inserting a double bond between the central core and end groups of the small molecule acceptor Y6 to extend its conjugation length and absorption range. As a result, a new narrow bandgap acceptor BTPV-4F was synthesized with an optical bandgap of 1.21 eV. The single-junction devices based on BTPV-4F as acceptor achieved a power conversion efficiency of over 13.4% with a high short-circuit current density of 28.9 mA cm−2. With adopting BTPV-4F as the rear cell acceptor material, the resulting tandem devices reached a high power conversion efficiency of over 16.4% with good photostability. The results indicate that BTPV-4F is an efficient infrared-absorbing narrow bandgap acceptor and has great potential to be applied into tandem organic solar cells.

Generating High-Order Transverse Patterns in Optically Pumped Semiconductor Lasers

2019 ◽  
Vol 25 (6) ◽  
pp. 1-7 ◽  
Author(s):  
Pi-Hui Tuan ◽  
Yen-Hui Hsieh ◽  
Chin-Wei Tu ◽  
Chi-Chun Lee ◽  
Chia-Han Tsou ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
High Order ◽  
Optically Pumped

scholarly journals 9.0% power conversion efficiency from ternary all-polymer solar cells

2017 ◽  
Vol 10 (10) ◽  
pp. 2212-2221 ◽  
Author(s):  
Zhaojun Li ◽  
Xiaofeng Xu ◽  
Wei Zhang ◽  
Xiangyi Meng ◽  
Zewdneh Genene ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
High Performance ◽  
Polymer Solar Cells ◽  
Power Conversion ◽  
Energy Level Alignment ◽  
Proper Energy

High-performance ternary all-polymer solar cells with outstanding efficiency of 9.0% are realized by incorporating two donor and one acceptor polymers with complementary absorption and proper energy level alignment.

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