Narrow linewidth emissions from organic crystals with diffraction gratings engraved directly on their surface (Conference Presentation)

2016 ◽  
Author(s):  
Hiroyuki Yamamoto ◽  
Takeshi Yamao ◽  
Shu Hotta
Keyword(s):  
Diffraction Gratings ◽  
Organic Crystals ◽  
Narrow Linewidth

Spectrally narrowed emissions from organic crystals mounted on transfer-printed parylene diffraction gratings

2013 ◽  
Vol 53 (1S) ◽  
pp. 01AD08 ◽  
Author(s):  
Yoshihide Fukaya ◽  
Yuki Obama ◽  
Shu Hotta ◽  
Takeshi Yamao
Keyword(s):  
Diffraction Gratings ◽  
Organic Crystals

Interpretation of irradiation-induced changes in electron diffractograms and images of extinction contours at low temperatures

1984 ◽  
Vol 42 ◽  
pp. 268-269
Author(s):  
E. Knapek ◽  
H. Formanek ◽  
G. Lefranc ◽  
I. Dietrich
Keyword(s):  
Low Temperatures ◽  
Carbon Films ◽  
Organic Crystals ◽  
Wide Spread ◽  
Lens System ◽  
Preparation Conditions ◽  
Thin Carbon ◽  
Electron Diffractograms ◽  
Diffraction Patterns ◽  
Induced Changes

A few years ago results on cryoprotection of L-valine were reported, where the values of the critical fluence De i.e, the electron exposure which decreases the intensity of the diffraction reflections by a factor e, amounted to the order of 2000 + 1000 e/nm2. In the meantime a discrepancy arose, since several groups published De values between 100 e/nm2 and 1200 e/nm2 /1 - 4/. This disagreement and particularly the wide spread of the results induced us to investigate more thoroughly the behaviour of organic crystals at very low temperatures during electron irradiation.For this purpose large L-valine crystals with homogenuous thickness were deposited on holey carbon films, thin carbon films or Au-coated holey carbon films. These specimens were cooled down to nearly liquid helium temperature in an electron microscope with a superconducting lens system and irradiated with 200 keU-electrons. The progress of radiation damage under different preparation conditions has been observed with series of electron diffraction patterns and direct images of extinction contours.

638 nm narrow linewidth diode laser with a grating external cavity

2020 ◽  
Vol 13 (6) ◽  
pp. 1-8
Author(s):  
LIU Ye ◽  
◽  
LIU Yu ◽  
XIAO Hui-dong ◽  
LI Hong-ling ◽  
...  
Keyword(s):  
Diode Laser ◽  
External Cavity ◽  
Narrow Linewidth

Organic Crystals, Germanates, Semiconductors

1980 ◽  
Author(s):  
L. N. Demianets ◽  
G. A. Emelchenko ◽  
J. Hesse ◽  
N. Karl ◽  
A. N. Lobachev ◽  
...  
Keyword(s):  
Organic Crystals
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