Traceable laser power measurements of diode laser radiation in the near infrared

MAPAN ◽  
2010 ◽  
Vol 25 (1) ◽  
pp. 29-35 ◽  
Author(s):  
Friedhelm Brandt ◽  
Stefan Kück ◽  
André Grütz
Keyword(s):  
Laser Radiation ◽  
Diode Laser ◽  
Laser Power ◽  
Near Infrared ◽  
Power Measurements

Near-Infrared Raman Spectroscopy with a 783-nm Diode Laser and CCD Array Detector

1989 ◽  
Vol 43 (3) ◽  
pp. 372-375 ◽  
Author(s):  
James M. Williamson ◽  
Robert J. Bowling ◽  
Richard L. McCreery
Keyword(s):  
Raman Spectroscopy ◽  
Diode Laser ◽  
Laser Power ◽  
Near Infrared ◽  
High Sensitivity ◽  
Array Detector ◽  
Charge Coupled Device ◽  
Ccd Array ◽  
Visible Lasers ◽  
Higher Sensitivity

A GaAlAs diode laser operating at 783 nm was combined with an unintensified charge coupled device (CCD) array detector and single grating spectrograph to obtain near-infrared (NIR) Raman spectra. The spectrometer has no moving parts and retains the high sensitivity expected for multichannel, shot-noise-limited detectors. Diode laser excitation permits high-sensitivity Raman spectroscopy with reduced fluorescence interference, in comparison to that produced with conventional visible lasers. The diode laser/CCD approach should exhibit much higher sensitivity than FT-Raman systems operating at 1064 nm, at much lower laser power. The sensitivity of the system was demonstrated by an S/N ratio of 17 for the 981-cm−1 band of 0.01 M (NH4)2SO4, obtained with 30 mW of 783 nm laser power.

scholarly journals Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process

Sensors ◽  
2015 ◽  
Vol 15 (4) ◽  
pp. 9582-9591 ◽  
Author(s):  
Hengtai Chang ◽  
Jun Chang ◽  
Qingjie Huang ◽  
Qiang Wang ◽  
Changbin Tian ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Diode Laser ◽  
Laser Power ◽  
Power Variation ◽  
Division Process ◽  
Optical Gas Sensor

scholarly journals Temperature Calibration Measurements based on Laser-Induced Phosphorescence Technique for Combustion Applications

2015 ◽  
Vol 10 (1) ◽  
Keyword(s):  
Laser Radiation ◽  
Laser Beam ◽  
Intensity Ratio ◽  
Laser Power ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Temperature Calibration ◽  
Phosphor Powder ◽  
Calibration Methods

Phosphor powder and phosphor-binder mixtures are successfully employed for temperature calibration measurements by using laser-induced phosphorescence (LIP) technique with an emphasis on higher precisions and accuracies than other non-intrusive methods. The phosphorescence intensities are used to perform these calibrations in three different strategies. The influence of laser power regular changes on particles heating and the calibration analyses is also carried out. A pulsed laser at 355 nm was used for exciting specimens of the phosphor powder as well as the phosphor-binder mixtures. The laser beam was directed onto the specimens and varied in three laser power levels (LPLs). The samples were kept in an oven with temperatures ranging from room temperature up to 1800 °C. The three strategies which are expressed in terms of non-dimensional intensity versus wavelength (NDI-W), normalised intensity (NI) and intensity ratio (IR) were used for the calibration assessments. A modified IR was compared with two different IRs. A precision of around ± (0.50-1.41)% was attained for different calibration methods. This research confirmed that these calibrations are possible using three different strategies, given high precisions and accuracies. The laser power alternations influenced the NI and do affect neither the NDI-W nor the IR curves. The laser radiation does not play any role for heating the particles of the studied powder.

Indocyanine Green Dye Enhanced Vascular Welding With the Near Infrared Diode Laser

1990 ◽  
Vol 24 (8) ◽  
pp. 564-570 ◽  
Author(s):  
Mehmet C. Oz ◽  
Roy S. Chuck ◽  
Jeffrey P. Johnson ◽  
Sareh Parangi ◽  
Lawrence S. Bass ◽  
...  
Keyword(s):  
Indocyanine Green ◽  
Diode Laser ◽  
Near Infrared ◽  
Indocyanine Green Dye
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