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Keywords = 1314 nm

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11 pages, 3520 KiB  
Communication
Diode-End-Pumped Continuous-Wave Tunable Nd3+:LiYF4 Laser Operating on the 4F3/2→4I13/2 Transition
by Chu Chu, Shuang Wang, Xinhua Fu and Zhenhua Du
Photonics 2025, 12(6), 613; https://doi.org/10.3390/photonics12060613 - 14 Jun 2025
Viewed by 308
Abstract
A laser diode (LD) end-pumped continuous-wave (CW) tunable Nd3+:LiYF4 (Nd:YLF) laser operating on the 4F3/2→4I13/2 transition was performed. Four single-wavelength (SW) lasing at 1321, 1314, 1371, and 1364 nm in the π-polarized direction and [...] Read more.
A laser diode (LD) end-pumped continuous-wave (CW) tunable Nd3+:LiYF4 (Nd:YLF) laser operating on the 4F3/2→4I13/2 transition was performed. Four single-wavelength (SW) lasing at 1321, 1314, 1371, and 1364 nm in the π-polarized direction and three SW lasing at 1314, 1326, and 1371 nm in the σ-polarized direction were achieved using a tuning prism. At 20 W pump power, the σ-polarized 1314 nm emission generated 7.3 W power output with 39.4% slope efficiency. Further, the three-pair of switchable π-polarized dual-wavelengths (DWs) at 1321/1314 nm, 1371/1364 nm, and 1321/1364 nm and the two-pair of switchable σ-polarized DWs at 1314/1326 nm and 1314/1371 nm were also realized by rotating an intracavity birefringence filter (BF). In addition, by employing dual intracavity BFs, the balanced DW output power was attained, achieving 6.4 W total maximum output at 1314/1321 nm in the π-polarized direction. Full article
(This article belongs to the Section Lasers, Light Sources and Sensors)
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16 pages, 8157 KiB  
Article
Evaluation and Validation on Sensitivity of Near-Infrared Diffuse Reflectance in Non-Invasive Human Blood Glucose Measurement
by Qing Ge, Tongshuai Han, Rong Liu, Zengfu Zhang, Di Sun, Jin Liu and Kexin Xu
Sensors 2024, 24(18), 5879; https://doi.org/10.3390/s24185879 - 10 Sep 2024
Cited by 2 | Viewed by 2955
Abstract
In non-invasive blood glucose measurement, the sensitivity of glucose-induced optical signals within human tissue is a crucial reference point. This study evaluates the sensitivity of glucose-induced diffuse reflectance in the 1000–1700 nm range. A key factor in understanding this sensitivity is the rate [...] Read more.
In non-invasive blood glucose measurement, the sensitivity of glucose-induced optical signals within human tissue is a crucial reference point. This study evaluates the sensitivity of glucose-induced diffuse reflectance in the 1000–1700 nm range. A key factor in understanding this sensitivity is the rate at which the scattering coefficient changes due to glucose, as it is significantly higher than in non-living media and predominantly influences the diffuse light signal level when blood glucose levels change. The study measured and calculated the changes in the scattering coefficient at 1314 nm, a wavelength chosen for its minimal interference from glucose absorption and other bodily constituents. Based on the Mie scattering theory and the results at 1314 nm, the changes in the scattering coefficient within the 1000–1700 nm range were estimated. Subsequently, the sensitivity of the glucose signal across this range was determined through Monte Carlo (MC) simulations. The findings from 25 human trials indicate that the measured sensitivities at five other typical wavelengths within this band generally align with the sensitivities calculated using the aforementioned method. This research can guide the identification of blood glucose signals and the selection of wavelengths for non-invasive blood glucose measurements. Full article
(This article belongs to the Special Issue IMU and Innovative Sensors for Healthcare)
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10 pages, 2689 KiB  
Article
Efficient Trichromatic Nd:YLF Laser Emitting at 1047 nm, 1053 nm and 1314 nm
by Felipe Maia Prado, Tomás Junqueira Franco and Niklaus Ursus Wetter
Photonics 2023, 10(10), 1146; https://doi.org/10.3390/photonics10101146 - 12 Oct 2023
Cited by 4 | Viewed by 1755
Abstract
We report a Nd:YLF laser, side-pumped by a diode-stack at 797 nm with 1545 W peak power, resulting in triple-wavelength emission at 1314 nm, 1053 nm, and 1047 nm. The resonator is capable of emitting each wavelength separately as well as any combination [...] Read more.
We report a Nd:YLF laser, side-pumped by a diode-stack at 797 nm with 1545 W peak power, resulting in triple-wavelength emission at 1314 nm, 1053 nm, and 1047 nm. The resonator is capable of emitting each wavelength separately as well as any combination of them simply by cavity alignment. When operating at 1314 nm, the laser reached record optical-to-optical efficiency of 49%, with a slope efficiency of 53%. Full article
(This article belongs to the Section Lasers, Light Sources and Sensors)
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