scholarly journals Diode-pumped, electro-optically Q-switched, cryogenic Tm:YAG laser operating at 1.88 μm

2021 ◽  
Vol 9 ◽  
Author(s):  
Jörg Körner ◽  
Venkatesan Jambunathan ◽  
Fangxin Yue ◽  
Jürgen Reiter ◽  
Ondřej Slezák ◽  
...  
Keyword(s):  
Energy Storage ◽  
Pump Power ◽  
Rate Equation ◽  
Laser Crystal ◽  
Equation Model ◽  
Design Constraints ◽  
Rate Equation Model ◽  
Tm:Yag Laser ◽  
Diode Pumped ◽  
Pulse Pump

Abstract We present a diode-pumped, electro-optically Q-switched Tm:YAG laser with a cryogenically cooled laser crystal at 120 K. Output pulses of up to 2.55 mJ and 650 ns duration were demonstrated in an actively Q-switched configuration with a repetition rate of 1 Hz. By using cavity dumping the pulse duration was shortened to 18 ns with only a slightly lower output energy of 2.22 mJ. Furthermore, using a simplified rate equation model, we discuss design constraints on the pump fluence in a pulse pump approach for Tm:YAG to maximize the energy storage capability at a given pump power.

scholarly journals Sub-nanosecond, megawatt compact diode-pumped Nd:YLF laser

2018 ◽  
Vol 64 (5) ◽  
pp. 512 ◽  
Author(s):  
Roger Sean Cudney ◽  
Citlali Minor
Keyword(s):  
Rate Equation ◽  
Repetition Rate ◽  
Laser Pulses ◽  
Equation Model ◽  
Experimental Results ◽  
Rate Equation Model ◽  
Compact Source ◽  
Nanosecond Pulses ◽  
Diode Pumped ◽  
Mode Locked Lasers

We present a compact source of sub-nanosecond infrared laser pulses. The system is a diode-pumped, passively Q-switched Nd:YLF laser that emits 1.047µm pulses with a FWHM duration of 750 ps, an energy of 2.3 mJ per pulse at a repetition rate of over 40 Hz. We also provide a simple rate-equation model that adequately describes the experimental results. This laser is ideal for several applications that require energetic sub-nanosecond pulses that cannot be obtained easily with actively Q-switched lasers or mode-locked lasers.

PERIOD-DOUBLING ROUTE TO CHAOS IN DIODE-PUMPED PASSIVELY Q-SWITCHED Nd:GdVO4 AND Nd:YVO4 LASERS

2006 ◽  
Vol 16 (09) ◽  
pp. 2689-2696 ◽  
Author(s):  
S. P. NG ◽  
D. Y. TANG ◽  
L. J. QIN ◽  
X. L. MENG ◽  
Z. J. XIONG
Keyword(s):  
Experimental Observation ◽  
Rate Equation ◽  
Period Doubling ◽  
Equation Model ◽  
Dynamic Behaviors ◽  
Rate Equation Model ◽  
Diode Pumped ◽  
Route To Chaos ◽  
Chaotic Nature

We report on the experimental observation of dynamic behaviors in diode pumped passively Q-switched Nd:GdVO 4 and Nd:YVO 4 lasers. In addition to the period-doubling route to chaos, various periodic windows have also been observed. Based on an extended rate equation model the chaotic nature of the lasers is numerically simulated. It was found that under the experimental condition the model could qualitatively reproduce the experimental observations.

scholarly journals Efficiency Droop and Effective Active Volume in GaN-Based Light-Emitting Diodes Grown on Sapphire and Silicon Substrates

2019 ◽  
Vol 9 (19) ◽  
pp. 4160 ◽  
Author(s):  
Ryu ◽  
Ryu ◽  
Onwukaeme
Keyword(s):  
Quantum Well ◽  
Rate Equation ◽  
Equation Model ◽  
Efficiency Droop ◽  
Internal Electric Field ◽  
Active Volume ◽  
Light Emitting ◽  
Rate Equation Model ◽  
Sapphire Substrates ◽  
The Difference

We compared the efficiency droop of InGaN multiple-quantum-well (MQW) blue light-emitting diode (LED) structures grown on silicon(111) and c-plane sapphire substrates and analyzed the efficiency droop characteristics using the rate equation model with reduced effective active volume. The efficiency droop of the LED sample on silicon was observed to be reduced considerably compared with that of the identical LED sample on sapphire substrates. When the measured external quantum efficiency was fitted with the rate equation model, the effective active volume of the MQW on silicon was found to be ~1.45 times larger than that of the MQW on sapphire. The lower efficiency droop in the LED on silicon could be attributed to its larger effective active volume compared with the LED on sapphire. The simulation results showed that the effective active volume decreased as the internal electric fields increased, as a result of the reduced overlap of the electron and hole distribution inside the quantum well and the inhomogeneous carrier distribution in the MQWs. The difference in the internal electric field of the MQW between the LED on silicon and sapphire could be a major reason for the difference in the effective active volume, and consequently, the efficiency droop.

A rate equation model for the energy transfer mechanism of a novel multi-color-emissive phosphor, Ca1.624Sr0.376Si5O3N6:Eu2+

2019 ◽  
Vol 6 (12) ◽  
pp. 3493-3500
Author(s):  
Jin Hee Lee ◽  
Satendra Pal Singh ◽  
Minseuk Kim ◽  
Myoungho Pyo ◽  
Woon Bae Park ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rate Equation ◽  
Equation Model ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Rate Equation Model ◽  
Broadband Emission

A novel multi-color-emissive phosphor (Ca1.624Sr0.376Si5O3N6:Eu2+) and a rate equation model to elucidate the mechanism of energy-transfer leading to broadband emission.

Application of a diffusion–desorption rate equation model in astrochemistry

2014 ◽  
Vol 168 ◽  
pp. 517-532 ◽  
Author(s):  
Jiao He ◽  
Gianfranco Vidali
Keyword(s):  
Rate Equation ◽  
Equation Model ◽  
Experimental Investigations ◽  
Desorption Rate ◽  
Desorption Energy ◽  
Energy Distributions ◽  
Rate Equation Model ◽  
Adsorption Sites ◽  
Adsorption Desorption ◽  
And Diffusion

Desorption and diffusion are two of the most important processes on interstellar grain surfaces; knowledge of them is critical for the understanding of chemical reaction networks in the interstellar medium (ISM). However, a lack of information on desorption and diffusion is preventing further progress in astrochemistry. To obtain desorption energy distributions of molecules from the surfaces of ISM-related materials, one usually carries out adsorption–desorption temperature programmed desorption (TPD) experiments, and uses rate equation models to extract desorption energy distributions. However, the often-used rate equation models fail to adequately take into account diffusion processes and thus are only valid in situations where adsorption is strongly localized. As adsorption–desorption experiments show that adsorbate molecules tend to occupy deep adsorption sites before occupying shallow ones, a diffusion process must be involved. Thus, it is necessary to include a diffusion term in the model that takes into account the morphology of the surface as obtained from analyses of TPD experiments. We take the experimental data of CO desorption from the MgO(100) surface and of D2 desorption from amorphous solid water ice as examples to show how a diffusion–desorption rate equation model explains the redistribution of adsorbate molecules among different adsorption sites. We extract distributions of desorption energies and diffusion energy barriers from TPD profiles. These examples are contrasted with a system where adsorption is strongly localized – HD from an amorphous silicate surface. Suggestions for experimental investigations are provided.

Rate-equation model of spin dynamics and polarized light emission for spin light-emitting diodes

2010 ◽  
Vol 81 (11) ◽  
Author(s):  
Oliver Brandt ◽  
Manfred Ramsteiner ◽  
Timur Flissikowski ◽  
Jens Herfort ◽  
Holger T. Grahn
Keyword(s):  
Rate Equation ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Spin Dynamics ◽  
Polarized Light ◽  
Equation Model ◽  
Light Emitting ◽  
Rate Equation Model
Sign in / Sign up

Export Citation Format

Share Document