Thermal quenching of fluorescence in chromium-doped fluoride laser crystals

Stalder, M.; Bass, Michael; Chai, B. H. T.

doi:10.1364/josab.9.002271

Cited by 112 publications

(42 citation statements)

References 6 publications

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“…A 200 mm radius of curvature mirror was employed to focus the intracavity mode onto the SBR surface to a spot size of 50 μm. than 200 °C, representing a critical threshold for lifetime quenching [16]. The decrease in the upper state lifetime limits the output power by increasing the laser threshold.…”

Section: Methodsmentioning

confidence: 99%

“…Among Cr:colquiriites, Cr:LiCAF has the highest thermal conductivity and maximum thermal quenching temperature combined with minimum quantum defect, excited-state absorption and upconversion rate [12,16,17]. Despite these facts, earlier studies with Cr:colquiriites mostly focused on Cr:LiSAF due to its broader gain bandwidth, slightly higher gain and availability of high-quality crystals with low passive losses in the order of 0.2% cm −1 .…”

Section: Introductionmentioning

confidence: 99%

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Diode-pumped continuous-wave and femtosecond Cr:LiCAF lasers with high average power in the near infrared, visible and near ultraviolet

Demırbas¹,

Baali²,

Acar³

et al. 2015

Opt. Express

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Abstract:We demonstrate continuous-wave (cw), cw frequency-doubled, cw mode-locked and Q-switched mode-locked operation of multimode diode-pumped Cr:LiCAF lasers with record average powers. Up to 2.54 W of cw output is obtained around 805 nm at an absorbed pump power of 5.5 W. Using intracavity frequency doubling with a BBO crystal, 0.9 W are generated around 402 nm, corresponding to an optical-to-optical conversion efficiency of 12%. With an intracavity birefringent tuning plate, the fundamental and frequency-doubled laser output is tuned continuously in a broad wavelength range from 745 nm to 885 nm and from 375 to 440 nm, respectively. A saturable Bragg reflector is used to initiate and sustain mode locking. In the cw mode-locked regime, the Cr:LiCAF laser produces 105-fs long pulses near 810 nm with an average power of 0.75 W. The repetition rate is 96.4 MHz, resulting in pulse energies of 7.7 nJ and peak powers of 65 kW. In Q-switched mode-locked operation, pulses with energies above 150 nJ are generated.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diode-pumped continuous-wave and femtosecond Cr:LiCAF lasers with high average power in the near infrared, visible and near ultraviolet

Demırbas¹,

Baali²,

Acar³

et al. 2015

Opt. Express

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show abstract

“…Além de aumentar a capacidade de armazenamento de energia, este tempo de vida permite o bombeamento por meio de lâmpadas flash. No entanto, este tempo de vida possui uma forte dependência com a temperatura do cristal [124] , como mostrado na Figura II-19, caindo para metade do valor a 69°C. Esta diminuição do tempo de vida resulta numa supressão da luminescência (quenching), causando uma redução da energia armazenada e do desempenho do meio de ganho.…”

Section: Ii31 Propriedades Dos Cristais De Cr:lisafunclassified

“…Esta baixa condutividade resulta na dificuldade da retirada do excesso de calor acumulado em função de um aumento da taxa de repetição do bombeamento, que leva a um aumento da temperatura e do gradiente térmico no meio de bastão. O primeiro efeito do aumento de temperatura é a ocorrência da supressão da luminescência (quenching) do tempo de vida da população do estado excitado [124] , que leva à diminuição de sua população e finalmente à uma menor capacidade de armazenar energia. Finalmente, o gradiente térmico pode levar à quebra do cristal.…”

Section: Ii51 Minimização Da Carga Térmica No Cristal De Cr:lisafunclassified

“…Todavia, esse valor concorda com aquele medido [124] a 77 K que se prevê ser o mesmo que à temperatura ambiente. Figura IV-18 -Medidas experimentais da emissão das lâmpadas a 100 J de bombeamento (quadrados abertos) e da emissão espontânea do Cr:LiSAF (círculos abertos), com a função empírica ajustada à emissão das lâmpadas (linha azul) e a solução numérica para a equação de taxa do Cr:LiSAF com τ=64 µs (linha vermelha), todas normalizadas para (amplitude de pico)=1.…”

Section: Roc=893%unclassified

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"Desenvolvimento de um amplificador de pulsos ultracurtos de Cr:LiSAF para um sistema laser híbrido de alta potência"

Samad¹

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Luminescence Thermometry on the Route of the Mobile‐Based Internet of Things (IoT): How Smart QR Codes Make It Real

Ramalho

Correia

et al. 2019

Advanced Science

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Quick Response (QR) codes are a gateway to the Internet of things (IoT) due to the growing use of smartphones/mobile devices and its properties like fast and easy reading, capacity to store more information than that found in conventional codes, and versatility associated to the rapid and simplified access to information. Challenges encompass the enhancement of storage capacity limits and the evolution to a smart label for mobile devices decryption applications. Organic–inorganic hybrids with europium (Eu3+) and terbium (Tb3+) ions are processed as luminescent QR codes that are able to simultaneously double the storage capacity and sense temperature in real time using a photo taken with the charge‐coupled device of a smartphone. The methodology based on the intensity of the red and green pixels of the photo yields a maximum relative sensitivity and minimum temperature uncertainty of the QR code sensor (293 K) of 5.14% · K−1 and 0.194 K, respectively. As an added benefit, the intriguing performance results from energy transfer involving the thermal coupling between the Tb3+‐excited level (5D4) and the low‐lying triplet states of organic ligands, being the first example of an intramolecular primary thermometer. A mobile app is developed to materialize the concept of temperature reading through luminescent QR codes.

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Thermal quenching of fluorescence in chromium-doped fluoride laser crystals

Cited by 112 publications

References 6 publications

Diode-pumped continuous-wave and femtosecond Cr:LiCAF lasers with high average power in the near infrared, visible and near ultraviolet

Diode-pumped continuous-wave and femtosecond Cr:LiCAF lasers with high average power in the near infrared, visible and near ultraviolet

"Desenvolvimento de um amplificador de pulsos ultracurtos de Cr:LiSAF para um sistema laser híbrido de alta potência"

Luminescence Thermometry on the Route of the Mobile‐Based Internet of Things (IoT): How Smart QR Codes Make It Real

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