Spectroscopic study and laser operation of Cr4+-doped (Sr,Ca)Gd4(SiO4)3O single crystals

Moncorgé, R.; Manaa, H.; Deghoul, F.; Borel, C.; Wyon, C.

doi:10.1016/0030-4018(95)00063-e

Cited by 14 publications

(5 citation statements)

References 6 publications

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“…In addition to the abovementioned structural models, there are still several structures with tetrahedral coordination such as Y 2 SiO 5 , Li 2 TiGeO 5 , Ca 2 Al 2 SiO 7 , SrGa 4 O 7 , Sr(Ga,Al) 2 O 4 , LiAlO 2 , LiGaO 2 , Li 2 NbGeO 5 , SrGd 4 (SiO 4 ) 3 O, and CaGd 4 (SiO 4 ) 3 O, which can accommodate Cr 4+ ions to produce NIR emission. [ 273–279 ] Therefore, more structures with four‐coordinated environment can be found for Cr 4+ to present broadband NIR luminescence.…”

Section: Advances In Chromium‐activated Phosphors: Structure Properti...mentioning

confidence: 99%

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Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Zhao

Song

Liu

2022

Laser & Photonics Reviews

248

145

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Cr3+/Cr4+‐activated near‐infrared (NIR) luminescent materials have attracted extensive attention owing to their tunable emission wavelength and widespread applications in plant growth, food analysis, biomedical imaging, night vision, and so on. Plenty of excellent NIR materials are developed by introducing Cr3+/Cr4+ ion to various inorganic hosts. Herein, the effect of crystal field on Cr3+/Cr4+ luminescence by combining the Tanabe–Sugano energy level diagram and configuration coordinate model is discussed. Research progress of Cr3+/Cr4+‐doped NIR luminescent materials, including the phosphors designed from structural models with octahedral, tetrahedral, and other coordination types, is then outlined. The luminescence properties of more than 200 kinds of Cr3+/Cr4+‐doped materials are summarized. In particular, several strategies for tuning emission wavelength, broadening emission band, enhancing NIR luminescence efficiency, and improving thermal stability, are listed. Finally, the current challenges and future prospects in the research of Cr3+/Cr4+‐doped NIR luminescent materials are presented. This review will contribute to a deeper understanding of not only Cr3+/Cr4+ luminescence mechanism but also the current research progress of chromium‐doped luminescent materials, so as to develop more Cr3+/Cr4+‐activated NIR luminescent materials with better performance and explore more applications.

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Section: Advances In Chromium‐activated Phosphors: Structure Properti...mentioning

confidence: 99%

“…LiGaO 2 , Li 2 NbGeO 5 , SrGd 4 (SiO 4 ) 3 O, and CaGd 4 (SiO 4 ) 3 O, which can accommodate Cr 4+ ions to produce NIR emission. [273][274][275][276][277][278][279] Therefore, more structures with four-coordinated environment can be found for Cr 4+ to present broadband NIR luminescence.…”

Section: Other Types Of Structuresmentioning

confidence: 99%

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Zhao

Song

Liu

2022

Laser & Photonics Reviews

248

145

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“…7). [21,110,111] 22 Note. σa and σa/σesa are the transverse absorption cross sections from the ground and excited states; τ is the bleaching relaxation time.…”

Section: Crmentioning

confidence: 98%

“…12c). Absorption in the range 0.85-1.20 μm is due to split transitions into states )) of TC Cr 4+ ions and is 2.6 μsec in CaGd 4 (SiO 4 ) 3 and 3.0 μsec in SrGd 4 (SiO 4 ) 3 crystals[21] …”

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confidence: 99%

Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

Malyarevich

Yumashev

2009

J Appl Spectrosc

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Published data on spectroscopic characteristics of saturable absorbers based on crystals doped with tetrahedrally coordinated transition-metal ions (Cr 2+ , Cr 4+ , Cr 5+ , V 3+ , Cr 2+ , Fe 2+ ) in addition to their use as passive Q-switches for solid-state lasers emitting in the visible and near-infrared regions are reviewed.Introduction. The use of saturable absorbers (SA) as passive Q-switches (PS) in solid-state lasers is an effective method for generating nanosecond and subnanosecond light pulses. This method differs favorably from active control of laser cavity gain by the lack of mechanical perturbations of the optical devices, additional sources of power supply, and external electrical control circuits. This simplifies the construction and operation of the laser and reduces its cost. Compact solid-state mini-lasers and ultra-small lasers (so-called microchip lasers) can be fabricated if PS are used.A SA is an optical material for which the transmission increases with increasing power density of the incident radiation. The SA should satisfy several requirements in order to be used as a PS. First of all this applies to SA characteristics at the laser operating wavelength such as absorption saturation energy density, coefficient of residual absorption in the fully bleached state, bleaching rise and fall time, and optical destruction threshold. The requirements for their absolute values depend on the spectroscopic properties of the lasing medium (LM) and the laser cavity parameters.In most instances with certain exceptions, SA based on tetrahedrally coordinated (TC) transition-metal ions of the iron group have bleaching relaxation times that are longer than the generation time of the laser pulses obtained using them. Such SA are usually called slowly relaxing. Relaxation processes leading to a restoration of their initial absorption can be ignored in analyzing their operation in a laser. In the simplest instance (if a four-level diagram is used for the spectroscopic model of the SA), the criterion for SA functioning as a PS is written [1-8]:

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“…1 Presently, the better tunable solid-state laser materials are mainly sapphire doped with Ti 3+ ion (tunable lasing wavelength range from 660 to 1100 nm) and crystals doped with tetrahedrally oxo coordinated Cr 4+ (tunable lasing wavelength range from 1130 to 1370 nm). [2][3][4][5][6] Their practical applications are limited due to small tuning range or low quantum efficiency of these materials in the NIR wavelength region. 3,7 Thus, it is a challenge to find tunable laser gain materials with higher quantum efficiency and operating with extended tuning range in the NIR wavelength region.…”

mentioning

confidence: 99%

Spectroscopic Investigation on BaSO₄:(Mn⁶⁺, Mn⁵⁺) Crystal

Cao

Qiu

et al. 2013

ECS J. Solid State Sci. Technol.

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BaSO4:(Mn6+, Mn5+) crystal was grown using MnCO3 as manganese source at high temperature from 650 to 750°C by the NaCl-KCl flux method in air and its spectroscopic properties were investigated. The experimental results indicate that Mn6+ and Mn5+ ions coexisted in the crystal. A broadband emission band peaking at ∼1060 nm due to the 2T2 → 2E transition of Mn6+ ion and a sharp emission band peaking at ∼1183 nm due to the 1E → 3A2 transition of Mn5+ ion were observed. Mn-doped BaSO4 single crystal may be a promising candidate as tunable near-infrared solid-state laser material.

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Spectroscopic study and laser operation of Cr4+-doped (Sr,Ca)Gd4(SiO4)3O single crystals

Cited by 14 publications

References 6 publications

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

Spectroscopic Investigation on BaSO₄:(Mn⁶⁺, Mn⁵⁺) Crystal

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Spectroscopic study and laser operation of Cr4+-doped (Sr,Ca)Gd4(SiO4)3O single crystals

Cited by 14 publications

References 6 publications

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

Spectroscopic Investigation on BaSO4:(Mn6+, Mn5+) Crystal

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Spectroscopic Investigation on BaSO₄:(Mn⁶⁺, Mn⁵⁺) Crystal