Увеличение оптической мощности микродисковых лазеров InGaAs/GaAs, перенесенных на кремниевую подложку методом термокомпрессии

The output power is studied under continuous-wave operation of microdisk lasers with InGaAs/GaAs quantum well-dots hybridly integrated with a silicon substrate with the epitaxial side down using the thermocompression bonding method. Owing a decrease in the thermal resistance and suppression of self-heating, an increase in the values of currents is observed at which the power is saturated and the lasing is quenched, as well as an increase in the peak power. In microdisks with a diameter of 19 µm, the highest output optical power in the continuous wave regime was 9.4 mW.

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Излучательные характеристики мощных полупроводниковых лазеров (1060 нм) с узким мезаполосковым контактом на основе асимметричных гетероструктур AlGaAs/GaAs с широким волноводом

Физика и техника полупроводников ◽

10.21883/ftp.2020.04.49149.9333 ◽

2020 ◽

Vol 54 (4) ◽

pp. 408

Author(s):

И.С. Шашкин ◽

А.Ю. Лешко ◽

Д.Н. Николаев ◽

В.В. Шамахов ◽

Н.А. Рудова ◽

...

Keyword(s):

Peak Power ◽

Continuous Wave ◽

Optical Power ◽

Maximum Efficiency ◽

Thermal Heating ◽

Cw Operation ◽

Power Profile ◽

Low Efficiency ◽

Narrow Stripe ◽

A Current

Light characteristics of narrow-stripe lasers (5.5 m) based on asymmetric AlGaAs/GaAs heterostructures are studied. It was shown that the maximum optical power achieved under continuous-wave (CW) operation is limited by thermal heating and reaches 1695 mW at a current of 2350 mA at +25°C, and the maximum efficiency reaches 54.8 %. By reducing the operating temperature to -8°C, we were able to increase the maximum power to 2 W. A peak power of 2930 mW was obtained under pulsed operation (pulse width 240 ns, amplitude 4230 mA). It is shown there is a region of an “optical dip” in the power profile with a low-efficiency lasing of a train of pulses of sub-ns duration under pulsed operation.

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Room temperature continuous wave operation of InAs/GaAs quantum dot photonic crystal nanocavity laser on silicon substrate

Optics Express ◽

10.1364/oe.17.007036 ◽

2009 ◽

Vol 17 (9) ◽

pp. 7036 ◽

Cited By ~ 44

Author(s):

Katsuaki Tanabe ◽

Masahiro Nomura ◽

Denis Guimard ◽

Satoshi Iwamoto ◽

Yasuhiko Arakawa

Keyword(s):

Photonic Crystal ◽

Quantum Dot ◽

Silicon Substrate ◽

Room Temperature ◽

Continuous Wave ◽

Continuous Wave Operation ◽

Gaas Quantum Dot

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Room temperature continuous wave operation of quantum cascade lasers with watt-level optical power

Applied Physics Letters ◽

10.1063/1.2894569 ◽

2008 ◽

Vol 92 (10) ◽

pp. 101105 ◽

Cited By ~ 104

Author(s):

Y. Bai ◽

S. R. Darvish ◽

S. Slivken ◽

W. Zhang ◽

A. Evans ◽

...

Keyword(s):

Room Temperature ◽

Continuous Wave ◽

Quantum Cascade Lasers ◽

Optical Power ◽

Quantum Cascade ◽

Continuous Wave Operation ◽

Cascade Lasers

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Erratum: Continuous-wave operation of lateral current injection multiquantum-well laser

Electronics Letters ◽

10.1049/el:19880924 ◽

1988 ◽

Vol 24 (21) ◽

pp. 1351

Author(s):

A. Furuya ◽

M. Makiuchi ◽

O. Wada

Keyword(s):

Continuous Wave ◽

Current Injection ◽

Continuous Wave Operation ◽

Lateral Current ◽

Multiquantum Well

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Continuous Wave Operation of a Ka-Band Broadband High-Power Sheet Beam Traveling-Wave Tube

IEEE Electron Device Letters ◽

10.1109/led.2021.3078484 ◽

2021 ◽

pp. 1-1

Author(s):

Jianxun Wang ◽

Yixin Wan ◽

Xinjie Li ◽

Qiang Liu ◽

Hao Li ◽

...

Keyword(s):

High Power ◽

Traveling Wave ◽

Continuous Wave ◽

Traveling Wave Tube ◽

Wave Tube ◽

Ka Band ◽

Continuous Wave Operation

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Enhancement of Photoacoustic Signal Strength with Continuous Wave Optical Pre-Illumination: A Non-Invasive Technique

Sensors ◽

10.3390/s21041190 ◽

2021 ◽

Vol 21 (4) ◽

pp. 1190

Author(s):

Anjali Thomas ◽

Souradip Paul ◽

Joy Mitra ◽

Mayanglambam Suheshkumar Singh

Keyword(s):

Methylene Blue ◽

Continuous Wave ◽

Optical Power ◽

Signal Strength ◽

Optical Beam ◽

Clinical Translation ◽

Optical Absorption Coefficient ◽

Invasive Technique ◽

Light Sources ◽

Chicken Tissue

Use of portable and affordable pulse light sources (light emitting diodes (LED) and laser diodes) for tissue illumination offers an opportunity to accelerate the clinical translation of photoacoustic imaging (PAI) technology. However, imaging depth in this case is limited because of low output (optical) power of these light sources. In this work, we developed a noninvasive technique for enhancing strength (amplitude) of photoacoustic (PA) signal. This is a photothermal-based technique in which a continuous wave (CW) optical beam, in addition to short-pulse ~ nsec laser beam, is employed to irradiate and, thus, raise the temperature of sample material selectively over a pre-specified region of interest (we call the process as pre-illumination). The increase in temperature, in turn enhances the PA-signal strength. Experiments were conducted in methylene blue, which is one of the commonly used contrast agents in laboratory research studies, to validate change in temperature and subsequent enhancement of PA-signal strength for the following cases: (1) concentration or optical absorption coefficient of sample, (2) optical power of CW-optical beam, and (3) time duration of pre-illumination. A theoretical hypothesis, being validated by numerical simulation, is presented. To validate the proposed technique for clinical and/or pre-clinical applications (diagnosis and treatments of cancer, pressure ulcers, and minimally invasive procedures including vascular access and fetal surgery), experiments were conducted in tissue-mimicking Agar phantom and ex-vivo animal tissue (chicken breast). Results demonstrate that pre-illumination significantly enhances PA-signal strength (up to ~70% (methylene blue), ~48% (Agar phantom), and ~40% (chicken tissue)). The proposed technique addresses one of the primary challenges in the clinical translation of LED-based PAI systems (more specifically, to obtain a detectable PA-signal from deep-seated tissue targets).

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Generation of spectrally-stable continuous-wave emission and ns pulses at 800 nm and 975 nm with a peak power of 4 W using a distributed Bragg reflector laser and a ridge-waveguide power amplifier

10.1117/12.2075652 ◽

2015 ◽

Cited By ~ 2

Author(s):

A. Klehr ◽

H. Wenzel ◽

J. Fricke ◽

F. Bugge ◽

A. Liero ◽

...

Keyword(s):

Power Amplifier ◽

Peak Power ◽

Continuous Wave ◽

Ridge Waveguide ◽

Bragg Reflector ◽

Distributed Bragg Reflector ◽

Wave Emission

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A Passively Q-Switched Holmium-Doped Fiber Laser with Graphene Oxide at 2058 nm

Applied Sciences ◽

10.3390/app11010407 ◽

2021 ◽

Vol 11 (1) ◽

pp. 407

Author(s):

Jinho Lee ◽

Ju Han Lee

Keyword(s):

Graphene Oxide ◽

Pump Power ◽

Fiber Laser ◽

Ring Resonator ◽

Continuous Wave ◽

Optical Power ◽

Polished Surface ◽

Fiber Ring ◽

Q Switching ◽

Side Polished Fiber

This study reports a Q-switching-based, 2058-nm holmium (Ho) fiber laser incorporating a saturable absorber (SA) based on graphene oxide (GO). The SA was prepared with a side-polished fiber, while GO particles were deposited onto the fiber-polished surface to realize an all-fiber SA. A continuous-wave thulium-doped all-fiber laser, which was configured with a master-oscillator power-amplifier (MOPA) structure, was constructed as a pumping source. By inserting the fabricated SA into an all-fiber ring resonator based on 1-m length of Ho-doped fiber, Q-switched pulses could readily be obtained at a wavelength of 2058 nm. The pulse width was observed to vary from 2.01 to 1.56 μs as the pump power was adjusted from ~759 to 1072 mW, while the repetition rate was tunable from 45.56 to 56.12 kHz. The maximum values of average optical power and pulse energy were measured as ~11.61 mW and 207.05 nJ, respectively, at a ~1072 mW pump power.

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