scholarly journals Research on spectral peaks thermal-drifting in multi-wavelength infrared laser diode

2014 ◽  
Vol 63 (15) ◽  
pp. 154206
Author(s):  
Xue Ming-Xi ◽  
Chen Zhi-Bin ◽  
Wang Wei-Ming ◽  
Ouyang Hui-Quan ◽  
Liu Xian-Hong ◽  
...  
Keyword(s):  
Laser Diode ◽  
Infrared Laser ◽  
Spectral Peaks ◽  
Multi Wavelength

Preparation of multi-wavelength infrared laser diode

2014 ◽  
Vol 10 (3) ◽  
pp. 194-197
Author(s):  
Ming-xi Xue ◽  
Zhi-bin Chen ◽  
Wei-ming Wang ◽  
Xian-hong Liu ◽  
Yan Song ◽  
...  
Keyword(s):  
Laser Diode ◽  
Infrared Laser ◽  
Multi Wavelength

Research on Quasi-Coaxial Beams Collimation Technique of Multi-Wavelength Infrared Laser Diode

2014 ◽  
Vol 41 (5) ◽  
pp. 0502008
Author(s):  
薛明晰 Xue Mingxi ◽  
陈志斌 Chen Zhibin ◽  
王伟明 Wang Weiming ◽  
王晓燕 Wang Xiaoyan
Keyword(s):  
Laser Diode ◽  
Infrared Laser ◽  
Multi Wavelength

scholarly journals Single lateral mode mid-infrared laser diode using wavelength-scale modulation of the facet reflectivity

2012 ◽  
Vol 100 (1) ◽  
pp. 011103 ◽  
Author(s):  
G. R. Nash ◽  
J. L. Stokes ◽  
J. R. Pugh ◽  
S. J. B. Przeslak ◽  
P. J. Heard ◽  
...  
Keyword(s):  
Laser Diode ◽  
Infrared Laser ◽  
Mid Infrared ◽  
Wavelength Scale ◽  
Facet Reflectivity ◽  
Lateral Mode

scholarly journals Strain variations in cone wavelength peaks in situ during zebrafish development

2019 ◽  
Vol 36 ◽  
Author(s):  
Ralph F. Nelson ◽  
Annika Balraj ◽  
Tara Suresh ◽  
Meaghan Torvund ◽  
Sara S. Patterson
Keyword(s):  
Physiological Measures ◽  
Cone Structure ◽  
Spectral Signal ◽  
Spectral Peaks ◽  
Old Adult ◽  
Multi Wavelength ◽  
Cone Opsins ◽  
Chromatic Processing ◽  
Cone Signal

Abstract There are four cone morphologies in zebrafish, corresponding to UV (U), blue (B), green (G), and red (R)-sensing types; yet genetically, eight cone opsins are expressed. How eight opsins are physiologically siloed in four cone types is not well understood, and in larvae, cone physiological spectral peaks are unstudied. We use a spectral model to infer cone wavelength peaks, semisaturation irradiances, and saturation amplitudes from electroretinogram (ERG) datasets composed of multi-wavelength, multi-irradiance, aspartate-isolated, cone-PIII signals, as compiled from many 5- to 12-day larvae and 8- to 18-month-old adult eyes isolated from wild-type (WT) or roy orbison (roy) strains. Analysis suggests (in nm) a seven-cone, U-360/B1-427/B2-440/G1-460/G3-476/R1-575/R2-556, spectral physiology in WT larvae but a six-cone, U-349/B1-414/G3-483/G4-495/R1-572/R2-556, structure in WT adults. In roy larvae, there is a five-cone structure: U-373/B2-440/G1-460/R1-575/R2-556; in roy adults, there is a four-cone structure, B1-410/G3-482/R1-571/R2-556. Existence of multiple B, G, and R types is inferred from shifts in peaks with red or blue backgrounds. Cones were either high or low semisaturation types. The more sensitive, low semisaturation types included U, B1, and G1 cones [3.0–3.6 log(quanta·μm−2·s−1)]. The less sensitive, high semisaturation types were B2, G3, G4, R1, and R2 types [4.3-4.7 log(quanta·μm−2·s−1)]. In both WT and roy, U- and B- cone saturation amplitudes were greater in larvae than in adults, while G-cone saturation levels were greater in adults. R-cone saturation amplitudes were the largest (50–60% of maximal dataset amplitudes) and constant throughout development. WT and roy larvae differed in cone signal levels, with lesser UV- and greater G-cone amplitudes occurring in roy, indicating strain variation in physiological development of cone signals. These physiological measures of cone types suggest chromatic processing in zebrafish involves at least four to seven spectral signal processing pools.

scholarly journals Two-wavelength thermal–optical determination of light-absorbing carbon in atmospheric aerosols

2019 ◽  
Vol 12 (6) ◽  
pp. 3173-3182 ◽  
Author(s):  
Dario Massabò ◽  
Alessandro Altomari ◽  
Virginia Vernocchi ◽  
Paolo Prati
Keyword(s):  
Laser Diode ◽  
Atmospheric Aerosols ◽  
Direct Determination ◽  
Optical Transmittance ◽  
Carbonaceous Aerosol ◽  
Electromagnetic Spectrum ◽  
Multi Wavelength ◽  
Physics Department ◽  
The University

Abstract. Thermal–optical analysis is widely adopted for the quantitative determination of total (TC), organic (OC), and elemental (EC) carbon in atmospheric aerosol sampled by suitable filters. Nevertheless, the methodology suffers from several uncertainties and artifacts such as the well-known issue of charring affecting the OC–EC separation. In the standard approach, the effect of the possible presence of brown carbon, BrC, in the sample is neglected. BrC is a fraction of OC, usually produced by biomass burning with a thermic behavior intermediate between OC and EC. BrC is optically active: it shows an increasing absorbance when the wavelength moves to the blue–UV region of the electromagnetic spectrum. Definitively, the thermal–optical characterization of carbonaceous aerosol should be reconsidered to address the possible BrC content in the sample under analysis. We introduce here a modified Sunset Lab Inc. EC–OC analyzer. Starting from a standard commercial instrument, the unit has been modified at the physics department of the University of Genoa (Italy), making possible the alternative use of the standard laser diode at λ=635 nm and of a new laser diode at λ=405 nm. In this way, the optical transmittance through the sample can be monitored at both wavelengths. Since at shorter wavelengths the BrC absorbance is higher, a better sensitivity to this species is gained. The modified instrument also gives the possibility to quantify the BrC concentration in the sample at both wavelengths. The new unit has been thoroughly tested, with both artificial and real-world aerosol samples: the first experiment, in conjunction with the multi-wavelength absorbance analyzer (MWAA; Massabò et al., 2013, 2015), resulted in the first direct determination of the BrC mass absorption coefficient (MAC) at λ=405 nm: MAC =23±1 m2 g−1.

scholarly journals Multi-wavelength transmittance photoplethysmography with near infrared laser diodes during exercise

2005 ◽  
Author(s):  
S. M. Lopez Silva ◽  
R. Giannetti ◽  
M. L. Dotor ◽  
D. Golmayo ◽  
P. Martin ◽  
...  
Keyword(s):  
Near Infrared ◽  
Laser Diodes ◽  
Infrared Laser ◽  
Multi Wavelength
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