Working Thermal Stresses in AlGaAs/GaAs High-Power Laser Diode Bars Using Infrared Thermography

Qiao, Yanbin; Feng, Shiwei; Cong, Xin; Zhu, Hongtu

doi:10.1109/tdmr.2013.2279253

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…Under varying operating conditions, the heat flux lost to the wall as a percentage of the total discharge power has been found to remain relatively constant [22,23]. For the T-140, average and peak temperatures similar to those reported by Martinez [23] are found if ∼25-27% of the discharge power is applied as a heat flux to the ionization/acceleration region of the T-140 thruster channel wall.…”

Section: Nomenclaturesupporting

confidence: 64%

“…This modeling is informed by prior experimental measurements of HET channel wall temperatures. Mazouffre et al [22] investigated the SPT100-ML and the PPSX000 using a midwave infrared (MWIR) (8-9 μm spectral domain) thermal infrared camera. The average temperatures of the BN-SiO 2 channel walls were well characterized by a power-law relationship, given in Eqs.…”

Section: Nomenclaturementioning

confidence: 99%

“…In comparison, Goebel calculates a 32% discharge power loss to the wall for an SPT-100, given assumptions of 25 eV electron temperatures [3]. This proportion (25-27%) of the discharge power reproduces Martinez's average temperature curve in both the 2D modeling and a simple bulk radiative heat balance model [22]. Figure 3 shows the T-140 channel, the surrounding structures, and the boundary conditions used in modeling the channel wall.…”

Section: Nomenclaturementioning

confidence: 99%

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Investigation of Plasma Material Erosion Under Mechanical Stress

Schinder

Rimoli

Walker

2017

Journal of Propulsion and Power

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The operational lifetime of traditional Hall effect thrusters is limited by the erosion of the discharge channel walls. Erosion during long-duration life testing of Hall effect thrusters produces surface features that are unexplained by present models. Anomalous erosion ridges are one such unexplained feature. Hall effect thrusters are also expected to be under moderate (100 kPa to 6 MPa) thermomechanical stresses when operating, due to heat loads from the plasma. Thus, there may be a relationship between mechanical stress and the erosion features observed in Hall effect thrusters. This work investigates the plasma erosion of materials placed under mechanical loads. An experiment is designed to detect any changes to the erosion of material samples due to stress. Amorphous fused-silica samples are investigated in this paper. Fused silica erodes quickly and has no material heterogeneity. Three pairs of fused-silica samples, each pair with one control sample and one sample loaded to 6.0, 14.4, and 25.0 1.1 MPa, respectively, are exposed to argon plasma for 11 h, producing erosion depths of 20-40 μm. Analysis of line scans made on the pre-and postexposure surfaces reveals the presence of a growth process operating on the initially roughened surface of the samples. Microscopy and line scans show the development of 100 μm parabolic cells bounded by sharp-edged cusps. No difference is detected in the development of surface features between unloaded samples and samples loaded up to 25.0 MPa. A model of the evolution of the surface accurately reproduces the development of the cell pattern, by taking into account the angle dependence of the atomic sputtering yield, yielding surfaces similar to those observed experimentally.

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Section: Nomenclaturesupporting

confidence: 64%

Section: Nomenclaturementioning

confidence: 99%

Section: Nomenclaturementioning

confidence: 99%

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Investigation of Plasma Material Erosion Under Mechanical Stress

Schinder

Rimoli

Walker

2017

Journal of Propulsion and Power

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“…As the need for producing high optical power increases, issues of cooling and packaging become important for stable high-power operation [3][4][5]. Designing an efficient heat sink for an LDB requires various considerations, such as the removal of thermal bottlenecks to obtain a low thermal resistance, matching thermal expansion coefficients for a long lifetime [6], and maintaining compact size.…”

Section: Introductionmentioning

confidence: 99%

Bypass Heat Sink Analysis for a Laser Diode Bar with a Top Canopy

Lee

Park

et al. 2017

Current Optics and Photonics

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With the increasing use of high-power laser diode bars (LDBs) and stacked LDBs, the issue of thermal control has become critical, as temperature is related to device efficiency and lifetime, as well as to beam quality. To improve the thermal resistance of an LDB set, we propose and analyze a bypass heat sink with a top canopy structure for an LDB set, instead of adopting a thick submount. The thermal bypassing in the top-canopy structure is efficient, as it avoids the cross-sectional thermal saturation that may exist in a thick submount. The efficient thickness range of the submount in a typical LDB set is guided by the thermal resistance as a function of thickness, and the simulated bypassing efficiency of a canopy is higher than a simple analytical prediction, especially for thinner canopies.

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“…GaAs-based laser diodes (LDs) have been applied broadly to various aspects, including frequency doubling and pumping sources for many solid state laser systems [1][2][3]. However, these applications http://dx.doi.org/10.1016/j.spmi.2015.01.006 0749-6036/Ó 2015 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%