Optical refrigeration: the role of parasitic absorption at cryogenic temperatures

Volpi, Azzurra; Meng, Junwei; Gragossian, Aram; Albrecht, Alexander R.; Rostami, Saeid; Lieto, A. Di; Epstein, Richard I.; Tonelli, M.; Hehlen, Markus P.; Sheik‐Bahae, Mansoor

doi:10.1364/oe.27.029710

Cited by 33 publications

(23 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…EQE measurements of the resulting sample were performed using time-gated laser-induced temperature modulation spectroscopy or TG-LITMoS. [6,17] In this technique, the temperature change ΔT in the sample, induced by a tunable laser, is measured as a function of laser frequency ν while keeping the photocarrier density (i.e., the total luminescence power P lum ) constant.…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Near‐Unity External Quantum Efficiency in GaAs|AlGaAs Heterostructures Grown by Molecular Beam Epitaxy

Giannini

Yang

Ashish³

et al. 2021

Physica Rapid Research Ltrs

Self Cite

View full text Add to dashboard Cite

The external quantum efficiency (EQE) of a GaAs|AlGaAs double heterostructure, grown by molecular beam epitaxy, is measured as a function of temperature in the range of 350-100 K. Record EQEs of >80% at 300 K and >98% below 150 K are obtained. The temperature-dependent lifetime measurement that corroborates the EQE data is also reported, suggesting that interface recombination remains the dominant mechanism for nonradiative decay. These results offer promising prospects for using these structures in thermal photovoltaic, electroluminescent, and laser cooling device applications.

show abstract

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Near‐Unity External Quantum Efficiency in GaAs|AlGaAs Heterostructures Grown by Molecular Beam Epitaxy

Giannini

Yang

Ashish³

et al. 2021

Physica Rapid Research Ltrs

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, it should be noted that room temperature measurements are insufficient to predict outcomes at cryogenic temperatures. The absorption coefficients of coolant ions and background impurities decrease with temperature [39], resulting in temperature-dependent saturation intensities. It is only in the case when the background absorption saturates first, at an intensity lower than the coolant ions, that lower minimum temperatures can be realized by increasing pump intensity.…”

Section: Discussionmentioning

confidence: 99%

Saturation, Allowed Transitions and Quantum Interference in Laser Cooling of Solids

2022

View full text Add to dashboard Cite

show abstract

“…[ 23 ] However, a recent study shows the background absorption could be temperature dependent. [ 24,25 ]…”

Section: Fundamentals Of Optical Refrigerationmentioning

confidence: 99%

“…[ 84 ] However, recent studies suggest this assumption needs to be revisited and the absorption parameter α b in Equation () should be temperature‐dependent. [ 24,25 ]…”

Section: Rare‐earth Doped Solidsmentioning

confidence: 99%

Quantum Point Defects for Solid‐State Laser Refrigeration

et al. 2020

View full text Add to dashboard Cite

Herein, the role that point defects have played over the last two decades in realizing solid‐state laser refrigeration is discussed. A brief introduction to the field of solid‐state laser refrigeration is given with an emphasis on the fundamental physical phenomena and quantized electronic transitions that have made solid‐state laser‐cooling possible. Lanthanide‐based point defects, such as trivalent ytterbium ions (Yb3+), have played a central role in the first demonstrations and subsequent development of advanced materials for solid‐state laser refrigeration. Significant discussion is devoted to the quantum mechanical description of optical transitions in lanthanide ions, and their influence on laser cooling. Transition‐metal point defects have been shown to generate substantial background absorption in ceramic materials, decreasing the overall efficiency of a particular laser refrigeration material. Other potential color centers based on fluoride vacancies with multiple potential charge states are also considered. In conclusion, novel materials for solid‐state laser refrigeration, including color centers in diamond that have recently been proposed to realize the solid‐state laser refrigeration of semiconducting materials, are discussed.

show abstract

Optical refrigeration: the role of parasitic absorption at cryogenic temperatures

Cited by 33 publications

References 20 publications

Near‐Unity External Quantum Efficiency in GaAs|AlGaAs Heterostructures Grown by Molecular Beam Epitaxy

Near‐Unity External Quantum Efficiency in GaAs|AlGaAs Heterostructures Grown by Molecular Beam Epitaxy

Saturation, Allowed Transitions and Quantum Interference in Laser Cooling of Solids

Quantum Point Defects for Solid‐State Laser Refrigeration

Contact Info

Product

Resources

About