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Compact diffraction grating laser wavemeter with sub-picometer accuracy and picowatt sensitivity using a webcam imaging sensor
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10.1063/1.4765744
/content/aip/journal/rsi/83/11/10.1063/1.4765744
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/11/10.1063/1.4765744
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of the wavemeter. Doublet lens focal lengths ; grating 1800 line/mm planar reflective holographic; θ1, 2 = 30°, 65°; and webcam CMOS sensor, 1920 × 1080 pixels each 3μm square (lens and IR filter removed).

Image of FIG. 2.
FIG. 2.

Sample of spectrum. Inset shows expanded region near laser line, with Gaussian fit (solid line).

Image of FIG. 3.
FIG. 3.

Calibration of wavelength from peak location for wavelengths between 778.8  nm to 782.8  nm. Each discrete point is an average of 100 measurements of the spectral peak location determined from a Gaussian fit to the raw spectrum. The solid line is a second-order polynomial fit, λ(nm) = λ2x 2 + λ1x + λ0, where x is the pixel number and λ2 = −8.42237 × 10−8, λ1 = 4.43609 × 10−3, λ0 = 777.948.

Image of FIG. 4.
FIG. 4.

Temperature dependence of the wavelength offset calibration. Temperature changes affect the grating pitch, producing a nearly linear offset over the tested range.

Image of FIG. 5.
FIG. 5.

Known and measured frequencies for the rubidium D2 hyperfine transitions compared to a measured saturated absorption spectrum. The horizontal error bars indicate the spectrometer wavelength uncertainty of .

Image of FIG. 6.
FIG. 6.

Sample of spectrum for ECDL operating in multiple longitudinal modes of the semiconductor diode cavity (1 mm length, 40 GHz mode spacing). Inset detail shows clear separation of the two modes.

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/content/aip/journal/rsi/83/11/10.1063/1.4765744
2012-11-27
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Compact diffraction grating laser wavemeter with sub-picometer accuracy and picowatt sensitivity using a webcam imaging sensor
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/11/10.1063/1.4765744
10.1063/1.4765744
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