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Author(s):  
Nina Ogrinc ◽  
Serge Schneider ◽  
Adèle Bourmaud ◽  
Michel Salzet ◽  
Isabelle Fournier

In the recent years, Cannabis and hemp-based products have become increasingly popular for various applications ranging from recreational use, edibles, beverages to health care products and medicines. The rapid detection and differentiation of phytocannabinoids is, therefore, essential to assess the potency, therapeutic and nutritional values of cannabis cultivars. Here, we implemented the SpiderMass technology for the in vivo detection of cannabidiol acid (CBDA) and tetrahydrocannabinol acid (THCA) and other endogenous organic plant compounds to access distribution gradients within the plants and differentiate cultivars. The SpiderMass system is composed of an IR- laser handheld microsampling probe connected to the mass spectrometer through a transfer tube. The analysis was performed in situ on different plant organs from freshly cultivated Cannabis plants in only a few seconds. SpiderMass analysis easily discriminated the two acid phytocannabinoid isomers by MS/MS and the built statistical models differentiated between four Cannabis cultivars. Different abundancies of acid phytocannabinoids were also found along the plant as well as between different cultivars. All together, these results introduce the direct analysis by SpiderMass as a compelling analytical alternative for forensic and hemp industrial analysis.


2021 ◽  
Vol 11 (24) ◽  
pp. 11875
Author(s):  
Chencheng Shen ◽  
Xianglong Cai ◽  
Tiancheng Zheng ◽  
Yuxi Jia ◽  
Dong Liu ◽  
...  

We demonstrated mid-infrared gaseous stimulated Raman scattering lasers in free space. Mixed gases of hydrogen and deuterium were used as Raman gain media in one Raman cell. Pumped by laser pulses at 1064 nm, the first Stokes Raman components at 1560 nm and 1907 nm were generated. A four-wave mixing process with the pump laser at 1064 nm and Raman lasers at 1560 nm and 1907 nm contributed to dramatically reducing the threshold of mid-IR laser generation at 4432 nm. The maximum output peak power of a mid-IR laser at 4432 nm reached 121 kW. Furthermore, by scattering on the rotational transition of deuterium, multispectral mid-IR Raman lasers at wavelengths of 2071 nm, 2266 nm, 2604 nm, 2920 nm, 3322 nm, 3743 nm, 4432 nm, and 5431 nm were also generated. Our results show that this is a convenient method to reduce the threshold and achieve a high power output with mid-IR Raman lasers.


2021 ◽  
Author(s):  
Enhao Li ◽  
Hiyori Uehara ◽  
Weichao Yao ◽  
Shigeki Tokita ◽  
Fedor Potemkin ◽  
...  

2021 ◽  
Vol 2127 (1) ◽  
pp. 012047
Author(s):  
V V Bliznyuk ◽  
V A Parshin ◽  
N S Savinov ◽  
A A Selivanov ◽  
A E Tarasov

Abstract In active optical-electronic systems for stream research that regulate thermal-physical parameters of diagnosed stream volume, the controlled source of the heat flow can be acquired by radiation of high-power IR laser diodes into the void. In the current work the peculiarities of measurement of this radiation are considered, specified by its strong divergence. It is shown that the measurements can involve laser wattmeters IMO-4M with planar thermoelectric primary measuring transformers of the laser radiation with a flat receiving site provided.


2021 ◽  
Vol 2127 (1) ◽  
pp. 012046
Author(s):  
N V Berezovskaya ◽  
V V Bliznyuk ◽  
A V Dolgov ◽  
V A Parshin ◽  
N S Savinov ◽  
...  

Abstract The paper proposes a method for predicting the service life of high-power laser diodes used in optoelectronic measuring systems which allow adjusting the thermophysical parameters of the diagnosed flow volume in a certain range of their values. The method based on the analysis of the current dependence of the shape of the line enveloping the laser radiation spectrum after 200 hours of their operation. It is shown that for such an analysis the emission spectrum must be considered as a superposition of the emission spectra of single-mode laser diodes.


2021 ◽  
Vol 51 (11) ◽  
pp. 1038-1043
Author(s):  
P A Ryabochkina ◽  
S A Khrushchalina ◽  
A N Belyaev ◽  
O S Bushukina ◽  
I A Yurlov ◽  
...  

2021 ◽  
Vol 2103 (1) ◽  
pp. 012107
Author(s):  
S S Rochas ◽  
I I Novikov ◽  
L Ya Karachinsky ◽  
A V Babichev ◽  
S A Blokhin ◽  
...  

Abstract The paper presents the results of studies of the conditions for the formation of A3B5 compound semiconductors heterointerfaces including InP, InGaAsP and GaAs layers. The heterostructures were grown by molecular-beam epitaxy and were fused by wafer fusion technique. Improvement of planarity and homogeneity over the thickness of heterointerface due to using optimized preliminary preparation of semiconductor wafer surfaces was demonstrated. No additional extended defects such as dislocations were found.


2021 ◽  
Vol 13 (18) ◽  
pp. 3628
Author(s):  
Gang Liang ◽  
Xinglei Zhao ◽  
Jianhu Zhao ◽  
Fengnian Zhou

The discrimination of water–land waveforms is a critical step in the processing of airborne topobathy LiDAR data. Waveform features, such as the amplitudes of the infrared (IR) laser waveforms of airborne LiDAR, have been used in identifying water–land interfaces in coastal waters through waveform clustering. However, water–land discrimination using other IR waveform features, such as full width at half maximum, area, width, and combinations of different features, has not been evaluated and compared with other methods. Furthermore, false alarms often occur when water–land discrimination in coastal areas is conducted using IR laser waveforms because of environmental factors. This study provides an optimal feature for water–land discrimination using an IR laser by comparing the performance of different waveform features and proposes a dual-clustering method integrating K-means and density-based spatial clustering applications with noise algorithms to improve the accuracy of water–land discrimination through the clustering of waveform features and positions of IR laser spot centers. The proposed method is used for practical measurement with Optech Coastal Zone Mapping and Imaging LiDAR. Results show that waveform amplitude is the optimal feature for water–land discrimination using IR laser waveforms among the researched features. The proposed dual-clustering method can correct mislabeled water or land waveforms and reduce the number of mislabeled waveforms by 48% with respect to the number obtained through traditional K-means clustering. Water–land discrimination using IR waveform amplitude and the proposed dual-clustering method can reach an overall accuracy of 99.730%. The amplitudes of IR laser waveform and the proposed dual-clustering method are recommended for water–land discrimination in coastal and inland waters because of the high accuracy, resolution, and automation of the methods.


2021 ◽  
Author(s):  
Viktor Kompanets ◽  
Svetlana Shelygina ◽  
Eteri Tolordava ◽  
Sergey Kudryashov ◽  
Irina Saraeva ◽  
...  

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