Solar-pumped Nd:Cr:GSGG parallel array laser

Thompson, George A.

doi:10.1117/12.60023

Cited by 16 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high EQE is retained at high temperatures due to the isolation of the electronic transitions from the phonons 25 . Common materials used for broad absorption and sensitization of Nd 3+ , as used for flash-pumped lasers [31][32][33] , are cerium (Ce 3+ ) and chromium (Cr 3+ ). We examined a variety of these dopant concentrations using both ceramic and SC models.…”

Section: Resultsmentioning

confidence: 99%

“…These materials also have a high EQE when doped in transparent matrices such as single-crystal (SC) and polycrystalline (ceramic) yttrium aluminum garnet (YAG), replacing different elements in the lattice. , The high EQE is retained at high temperatures because of the isolation of the electronic transitions from the phonons . Common materials used for broad absorption and sensitization of Nd 3+ , as used for flash-pumped lasers, − are cerium (Ce 3+ ) and chromium (Cr 3+ ). We examined a variety of these dopant concentrations using both ceramic and SC models.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Luminescent Solar Power—PV/Thermal Hybrid Electricity Generation for Cost-Effective Dispatchable Solar Energy

Haviv

Revivo

Kruger

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The challenge in solar energy today is not the cost of photovoltaic (PV) electricity generation, already competing with fossil fuel prices, but rather utility-scale energy storage and flexibility in supply. Low-cost thermal energy storage (TES) exists but relies on expensive heat engines. Here, we introduce the concept of luminescent solar power (LSP), where sunlight is absorbed in a photoluminescent (PL) absorber, followed by red-shifted PL emission matched to an adjacent PV cell’s band edge. This way the PV cell operates nearly as efficiently as under direct illumination but with minimal excessive heat. The PL absorber temperature rises because of thermalization, allowing it to store the excessive heat, which can later be converted into electricity. Tailored luminescent materials that support an additional 1.5 kW h PV electricity for every 1 kW h of (virtual) heat engine electricity with a dynamic shift between the two sources are experimentally demonstrated. Such an ideal hybrid system may lead to a potential reduction in the cost of electricity for a base-load solution.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Luminescent Solar Power—PV/Thermal Hybrid Electricity Generation for Cost-Effective Dispatchable Solar Energy

Haviv

Revivo

Kruger

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…It is shown that the flashlamp-pumped Cr:Nd:GSGG system has twice the efficiency of analogous Nd:YAG laser systems [2,7]. Similar performance could also be achieved under solar pumping [8][9][10].…”

Section: Introductionmentioning

confidence: 82%

Red-diode-pumped Cr:Nd:GSGG laser: two-color mode-locked operation

et al. 2017

View full text Add to dashboard Cite

We have investigated in detail the continuous-wave (cw) and mode-locked performance of a diode-pumped Cr:Nd:GSGG laser. State-of-the-art single-mode and multimode laser diodes around 665 nm were used as pump sources. In cw operation, we have demonstrated lasing thresholds as low as 14 mW, slope efficiencies as high as 23.4%, and output powers up to 738 mW. The free running emission wavelength was 1061 nm. Lasing could also be obtained at 1051, 1058, 1065, 1068, 1072, 1103, and 1111 nm lines. A saturable Bragg reflector was used to initiate and sustain mode-locking where the Cr:Nd:GSGG laser produced 6-ps-long pulses around 1061 nm with an average power of 160 mW. The repetition rate was 142.65 MHz, resulting in pulse energies of 1.1 nJ and peak powers of 175 W. An off-surface optical axis quartz birefringent filter (BRF) was inserted inside the laser cavity at Brewster's angle to obtain two-color cw and mode-locked laser operation at the 1051 and 1058 nm and 1058 and 1061 transition pairs, resulting in cw powers up to 60 mW and cw mode-locked average powers up to 45 mW. Unlike many other methods applied for two-color mode-locked laser operation, usage of the BRF enabled regulation of the ratio of the power in each line by fine adjustment of its rotation angle. The method could potentially be used for other gain media as well, which could simplify development of multicolor solid-state laser systems.

show abstract

“…Unfortunately, RE's absorption lines are typically narrow and do not absorb sunlight to the required degree. Sensitization of RE elements, which increases broadband absorption, is a well-known method used to increase efficiencies of flash lamp pumped RE lasers and solar powered lasers [16][17][18][19][20][21]. Specifically, neodymium (Nd 3+ ), frequently used for its high luminescent EQE, is promising for TEPL as its spectral emissivity contains lines below and above the bandgap of GaAs PV cells, allowing blueshifting of the high temperature PL emission above the bandgap (figure 1(d)).…”

mentioning

confidence: 99%

“…The Cr 3+ acts as a sensitizer to Nd 3+ emission, allowing for broadband absorption of the excitation spectrum. In addition, a Cr 0.2% :Nd 1.0% :GSGG crystal was examined, as GSGG was also studied as an Nd 3+ host for lasers [20,21]. All crystals were cut into 2×2×5 mm rectangular rods and excited on the 2×2 mm facet.…”

mentioning

confidence: 99%

Thermally enhanced photoluminescence for energy harvesting: from fundamentals to engineering optimization

Kruger

Kurtulik

Revivo

et al. 2018

J. Opt.

View full text Add to dashboard Cite

The radiance of thermal emission, as described by Planck's law, depends only on the emissivity and temperature of a body, and increases monotonically with the temperature rise at any emitted wavelength. Non-thermal radiation, such as photoluminescence (PL), is a fundamental light-matter interaction that conventionally involves the absorption of an energetic photon, thermalization, and the emission of a redshifted photon. Such a quantum process is governed by rate conservation, which is contingent on the quantum efficiency. In the past, the role of rate conservation for significant thermal excitation had not been studied. Recently, we presented the theory and an experimental demonstration that showed, in contrast to thermal emission, that the PL rate is conserved when the temperature increases while each photon is blueshifted. A further rise in temperature leads to an abrupt transition to thermal emission where the photon rate increases sharply. We also demonstrated how such thermally enhanced PL (TEPL) generates orders of magnitude more energetic photons than thermal emission at similar temperatures. These findings show that TEPL is an ideal optical heat pump that can harvest thermal losses in photovoltaics with a maximal theoretical efficiency of 70%, and practical concepts potentially reaching 45% efficiency. Here we move the TEPL concept onto the engineering level and present Cr:Nd:YAG as device grade PL material, absorbing solar radiation up to 1 μm wavelength and heated by thermalization of energetic photons. Its blueshifted emission, which can match GaAs cells, is 20% of the absorbed power. Based on a detailed balance simulation, such a material coupled with proper photonic management can reach 34% power conversion efficiency. These results raise confidence in the potential of TEPL becoming a disruptive technology in photovoltaics.

show abstract

Solar-pumped Nd:Cr:GSGG parallel array laser

Cited by 16 publications

References 7 publications

Luminescent Solar Power—PV/Thermal Hybrid Electricity Generation for Cost-Effective Dispatchable Solar Energy

Luminescent Solar Power—PV/Thermal Hybrid Electricity Generation for Cost-Effective Dispatchable Solar Energy

Red-diode-pumped Cr:Nd:GSGG laser: two-color mode-locked operation

Thermally enhanced photoluminescence for energy harvesting: from fundamentals to engineering optimization

Contact Info

Product

Resources

About