Development of beam brightness enhancement based on diamond Raman conversion

2021 ◽  
Vol 50 (1) ◽  
pp. 20200098-20200098
Author(s):  
白振旭 Zhenxu Bai ◽  
陈晖 Hui Chen ◽  
李宇琪 Yuqi Li ◽  
杨学宗 Xuezong Yang ◽  
齐瑶瑶 Yaoyao Qi ◽  
...  
Keyword(s):  
Brightness Enhancement ◽  
Raman Conversion

Development of beam brightness enhancement based on diamond Raman conversion

2021 ◽  
Vol 50 (1) ◽  
pp. 20200098-20200098
Author(s):  
白振旭 Zhenxu Bai ◽  
陈晖 Hui Chen ◽  
李宇琪 Yuqi Li ◽  
杨学宗 Xuezong Yang ◽  
齐瑶瑶 Yaoyao Qi ◽  
...  
Keyword(s):  
Brightness Enhancement ◽  
Raman Conversion

Underwater Image Enhancement Method Combining color and Luminance

2020 ◽  
Vol 13 ◽  
Author(s):  
ZHAO Baiting ◽  
WANG Feng ◽  
JIA Xiaofen ◽  
GUO Yongcun ◽  
WANG Chengjun
Keyword(s):  
Image Enhancement ◽  
Color Space ◽  
Low Frequency ◽  
Brightness Enhancement ◽  
Color Distortion ◽  
Underwater Image ◽  
Enhancement Method ◽  
Frequency Components ◽  
Image Contour ◽  
Objective Indicators

Background:: Aiming at the problems of color distortion, low clarity and poor visibility of underwater image caused by complex underwater environment, a wavelet fusion method UIPWF for underwater image enhancement is proposed. Methods:: First of all, an improved NCB color balance method is designed to identify and cut the abnormal pixels, and balance the color of R, G and B channels by affine transformation. Then, the color correction map is converted to CIELab color space, and the L component is equalized with contrast limited adaptive histogram to obtain the brightness enhancement map. Finally, different fusion rules are designed for low-frequency and high-frequency components, the pixel level wavelet fusion of color balance image and brightness enhancement image is realized to improve the edge detail contrast on the basis of protecting the underwater image contour. Results:: The experiments demonstrate that compared with the existing underwater image processing methods, UIPWF is highly effective in the underwater image enhancement task, improves the objective indicators greatly, and produces visually pleasing enhancement images with clear edges and reasonable color information. Conclusion:: The UIPWF method can effectively mitigate the color distortion, improve the clarity and contrast, which is applicable for underwater image enhancement in different environments.

Investigation of Yb:CaWO4 as a potential new self-Raman laser crystal

CrystEngComm ◽  
2021 ◽  
Author(s):  
Junxian Chen ◽  
Liang Dong ◽  
Fenfen Liu ◽  
Honghao Xu ◽  
Junhai Liu
Keyword(s):  
Laser Crystal ◽  
Laser Action ◽  
Raman Laser ◽  
Czochralski Method ◽  
High Quality ◽  
Raman Conversion

High-quality Yb:CaWO4 crystal was grown using the Czochralski method; laser action and self-Raman conversion were demonstrated.

Order-selective Raman conversion by dual-wavelength-pumped four-wave mixing

1994 ◽  
Vol 11 (11) ◽  
pp. 2182 ◽  
Author(s):  
Tsuneo Nakata ◽  
Tadashi Yamada ◽  
Fumihiko Kannari
Keyword(s):  
Four Wave Mixing ◽  
Dual Wavelength ◽  
Wave Mixing ◽  
Raman Conversion

scholarly journals Coding Scheme for Assessment of Students’ Explanations and Predictions

2017 ◽  
Vol 8 ◽  
Author(s):  
Mihael Gojkošek ◽  
Gorazd Planinšič ◽  
Josip Sliško
Keyword(s):  
Reliability Analysis ◽  
White Light ◽  
Assessment Tool ◽  
Self Assessment ◽  
Brightness Enhancement ◽  
Coding Scheme ◽  
Reliable Assessment

In the process of analyzing students’ explanations and predictions for interaction between brightness enhancement film and beam of white light, a need for objective and reliable assessment instrumentarose. Consequently, we developed a codingscheme that was mostly inspired by the rubrics for self-assessment of scientific abilities. In the paper we present the grading categories that were integrated in the coding scheme, and descriptions of criteria used for evaluation of students work. We report the results of reliability analysis of new assessment tool and present some examples of its application.

Brightness enhancement and opponent-colors theory

1966 ◽  
Vol 6 (11-12) ◽  
pp. 689-699 ◽  
Author(s):  
Gerald S. Wasserman
Keyword(s):  
Brightness Enhancement

Spectroscopic properties at 1.351 μm of Nd3+-doped KY(WO4)2 and KGd(WO4)2 single crystals for Raman conversion

2001 ◽  
Vol 16 (1-2) ◽  
pp. 207-211 ◽  
Author(s):  
A Brenier ◽  
F Bourgeois ◽  
G Métrat ◽  
N Muhlstein ◽  
G Boulon
Keyword(s):  
Single Crystals ◽  
Spectroscopic Properties ◽  
Raman Conversion
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