Multi-wavelength investigation of the influence of polarization orientation on bulk damage resistance of type I doubler KDP crystals

2019 ◽  
Author(s):  
Yinbo Zheng ◽  
Rong Sheng Ba ◽  
Xin Da Zhou ◽  
Jie Li ◽  
Lei Ding ◽  
...  
Keyword(s):  
Type I ◽  
Damage Resistance ◽  
Multi Wavelength ◽  
Polarization Orientation ◽  
Kdp Crystals

Preliminary study of the damage resistance of type I doubler KDP crystals at 532 nm

2016 ◽  
Vol 14 (5) ◽  
pp. 051601-51603 ◽  
Author(s):  
Yinbo Zheng Yinbo Zheng ◽  
Lei Ding Lei Ding ◽  
Xinda Zhou Xinda Zhou ◽  
Rongsheng Ba Rongsheng Ba ◽  
Jing Yuan Jing Yuan ◽  
...  
Keyword(s):  
Type I ◽  
Damage Resistance ◽  
Preliminary Study ◽  
Kdp Crystals ◽  
532 Nm

scholarly journals Performance of rapid-grown KDP crystals with continuous filtration

2015 ◽  
Vol 3 ◽  
Author(s):  
Guohang Hu ◽  
Yueliang Wang ◽  
Junxiu Chang ◽  
Xiaoyi Xie ◽  
Yuanan Zhao ◽  
...  
Keyword(s):  
Near Infrared ◽  
Laser Damage ◽  
Damage Resistance ◽  
Damage Initiation ◽  
Micron Size ◽  
Continuous Filtration ◽  
Laser Induced Damage ◽  
Almost All ◽  
Lower Correlation ◽  
Kdp Crystals

Rapid growth processing of KDP crystals was improved by employing continuous filtration to eliminate bulk defects. The performances of the KDP crystals, including scattering defects, laser damage resistance and transmittance, were measured and analyzed. Compared with rapid-grown KDP without continuous filtration, the transmittance in the near-infrared was increased by at least 2%, almost all of ‘micron size’ defects were eliminated and ‘sub-micron size’ defects were decreased by approximately 90%. Laser damage testing revealed that the laser-induced damage thresholds (LIDTs), as well as the consistency of the LIDTs from sample to sample, were improved greatly. Moreover, it identified that ‘micron size’ defects were the precursors which initiated laser damage at relative lower laser fluence (4–6 J cm−2), and there was a lower correlation between smaller size scattering defects and laser damage initiation. The improved consistency in the LIDTs, attributed to elimination of ‘micron size’ defects, and LIDT enhancement originated from the decreased absorption of the KDP crystals.

scholarly journals A nearby super-luminous supernova with a long pre-maximum & “plateau” and strong C II features

2018 ◽  
Vol 620 ◽  
pp. A67 ◽  
Author(s):  
J. P. Anderson ◽  
P. J. Pessi ◽  
L. Dessart ◽  
C. Inserra ◽  
D. Hiramatsu ◽  
...  
Keyword(s):  
Formation Rate ◽  
Early Time ◽  
Absolute Magnitude ◽  
Host Galaxy ◽  
Type I ◽  
Optical Wavelength ◽  
Near Ir ◽  
Spectral Models ◽  
Multi Wavelength ◽  
Ir Photometry

Context. Super-luminous supernovae (SLSNe) are rare events defined as being significantly more luminous than normal terminal stellar explosions. The source of the additional power needed to achieve such luminosities is still unclear. Discoveries in the local Universe (i.e. z < 0.1) are scarce, but afford dense multi-wavelength observations. Additional low-redshift objects are therefore extremely valuable. Aims. We present early-time observations of the type I SLSN ASASSN-18km/SN 2018bsz. These data are used to characterise the event and compare to literature SLSNe and spectral models. Host galaxy properties are also analysed. Methods. Optical and near-IR photometry and spectroscopy were analysed. Early-time ATLAS photometry was used to constrain the rising light curve. We identified a number of spectral features in optical-wavelength spectra and track their time evolution. Finally, we used archival host galaxy photometry together with H II region spectra to constrain the host environment. Results. ASASSN-18km/SN 2018bsz is found to be a type I SLSN in a galaxy at a redshift of 0.0267 (111 Mpc), making it the lowest-redshift event discovered to date. Strong C II lines are identified in the spectra. Spectral models produced by exploding a Wolf-Rayet progenitor and injecting a magnetar power source are shown to be qualitatively similar to ASASSN-18km/SN 2018bsz, contrary to most SLSNe-I that display weak or non-existent C II lines. ASASSN-18km/SN 2018bsz displays a long, slowly rising, red “plateau” of >26 days, before a steeper, faster rise to maximum. The host has an absolute magnitude of –19.8 mag (r), a mass of M⋆ = 1.5−0.33+0.08 × 109 M⊙, and a star formation rate of = 0.50−0.19+2.22 M⊙ yr −1. A nearby H II region has an oxygen abundance (O3N2) of 8.31 ± 0.01 dex.

Switchable soliton mode-locked and multi-wavelength operation in thulium-doped all-fiber ring laser

2016 ◽  
Vol 25 (03) ◽  
pp. 1650034 ◽  
Author(s):  
A. A. Latiff ◽  
H. Shamsudin ◽  
Z. C. Tiu ◽  
H. Ahmad ◽  
S. W. Harun
Keyword(s):  
Pump Power ◽  
Signal To Noise Ratio ◽  
Gain Medium ◽  
Power Fluctuation ◽  
Pulse Profile ◽  
Soliton Pulse ◽  
Maximum Pulse Energy ◽  
Multi Wavelength ◽  
Nonlinear Polarization Rotation ◽  
Polarization Orientation

A switchable soliton mode-locked and multi-wavelength operation in thulium-doped fiber laser (TDFL) is demonstrated based on nonlinear polarization rotation (NPR) technique. The TDFL produces a soliton pulse operating at 1917.66[Formula: see text]nm using a 5[Formula: see text]m long thulium-doped fiber (TDF) as a gain medium as well as nonlinear medium. The solitonic behavior is further identified with two orders of Kelly sidebands in the output spectrum. The mode-locked emission is obtained from threshold pump power of 522–1052[Formula: see text]mW with consistent pulse repetition rate of 14.7[Formula: see text]MHz. Maximum pulse energy is calculated as 0.89[Formula: see text]nJ at pump power of 1052[Formula: see text]mW, whereas the maximum pulse width is estimated to be approximately 1.36[Formula: see text]ps corresponding to sech2 pulse profile. By shifting the polarization orientation, the cavity can change to multi-wavelength operation with signal-to-noise ratio (SNR) higher than 53[Formula: see text]dB. At pump power of 1037[Formula: see text]mW, three stable peak wavelengths are generated with a power fluctuation and constant spacing of [Formula: see text] dB and 7.4[Formula: see text]nm, respectively.

scholarly journals GRB Progenitors and Observational Criteria

2011 ◽  
Vol 7 (S279) ◽  
pp. 102-109
Author(s):  
Bing Zhang
Keyword(s):  
Compact Star ◽  
High Redshift ◽  
Compact Stars ◽  
Type I ◽  
Type Ii ◽  
Long Duration ◽  
Multi Wavelength ◽  
Third Dimension ◽  
Low Amplitude ◽  
Short Grbs

AbstractPhenomenologically, two classes of GRBs (long/soft vs. short/hard) are identified based on their γ-ray properties. The boundary between the two classes is vague. Multi-wavelength observations lead to identification of two types of GRB progenitors: one related to massive stars (Type II), and another related to compact stars (Type I). Evidence suggests that the majority of long GRBs belong to Type II, while at least the majority of nearby short GRBs belong to Type I. Nonetheless, counter examples do exist. Both long-duration Type I and short-duration Type II GRBs have been observed. In this talk, I review the complications in GRB classification and efforts in diagnosing GRB progenitors based on multiple observational criteria. In particular, I raise the caution to readily accept that all short/hard GRBs detected by BATSE are due to compact star mergers. Finally, I propose to introduce “amplitude” as the third dimension (besides “duration” and “hardness”) to quantify burst properties, and point out that the “tip-of-the-iceberg” effect may introduce confusion in defining the physical category of GRBs, especially for low-amplitude, high-redshift GRBs.

scholarly journals 1.2 Å resolution crystal structure of the periplasmic aminotransferase PvdN fromPseudomonas aeruginosa

2016 ◽  
Vol 72 (5) ◽  
pp. 403-408 ◽  
Author(s):  
Eric J. Drake ◽  
Andrew M. Gulick
Keyword(s):  
Biosynthetic Pathway ◽  
Pyridoxal Phosphate ◽  
Positive Density ◽  
Type I ◽  
Structural Homology ◽  
Peptide Synthetase ◽  
High Resolution Structure ◽  
Multi Wavelength ◽  
Peptide Product ◽  
Resolution Structure

The Gram-negative pathogenPseudomonas aeruginosauses a nonribosomal peptide synthetase (NRPS) biosynthetic cluster for the production of a peptide siderophore. In addition to four multimodular NRPS proteins, the biosynthetic pathway also requires several additional enzymes involved in the production of nonproteinogenic amino acids and maturation of the peptide product. Among the proteins that are required for the final steps in pyoverdine synthesis is PvdN, a pyridoxal phosphate-dependent enzyme that catalyzes an uncharacterized step in pyoverdine production. This study reports the high-resolution structure of PvdN bound to a PLP cofactor solved by multi-wavelength anomalous dispersion (MAD). The PvdN model shows high structural homology to type I aspartate aminotransferases and also contains positive density that suggests an uncharacterized external aldimine.

Laser conditioning process combining N/1 and S/1 programs to improve the damage resistance of KDP crystals

2009 ◽  
Author(s):  
Yuanan Zhao ◽  
Guohang Hu ◽  
Jianda Shao ◽  
Xiaofeng Liu ◽  
Hongbo He ◽  
...  
Keyword(s):  
Damage Resistance ◽  
Laser Conditioning ◽  
Conditioning Process ◽  
Kdp Crystals

Toward a better understanding of multi-wavelength effects on KDP crystals

2009 ◽  
Author(s):  
Stéphane Reyné ◽  
Marc Loiseau ◽  
Guillaume Duchateau ◽  
Jean-Yves Natoli ◽  
Laurent Lamaignère
Keyword(s):  
Multi Wavelength ◽  
Kdp Crystals

Multi-wavelength study of nanosecond laser-induced bulk damage morphology in KDP crystals

2015 ◽  
Vol 119 (4) ◽  
pp. 1317-1326 ◽  
Author(s):  
S. Reyné ◽  
G. Duchateau ◽  
L. Hallo ◽  
J. Y. Natoli ◽  
L. Lamaignère
Keyword(s):  
Nanosecond Laser ◽  
Damage Morphology ◽  
Multi Wavelength ◽  
Kdp Crystals
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