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Collimated blue light generation in rubidium vapor
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10.1119/1.4795311
/content/aapt/journal/ajp/81/6/10.1119/1.4795311
http://aip.metastore.ingenta.com/content/aapt/journal/ajp/81/6/10.1119/1.4795311
View: Figures

Figures

Image of Fig. 1.
Fig. 1.

Partial energy level diagram for rubidium.

Image of Fig. 2.
Fig. 2.

Experimental apparatus. Components include grating-feedback diode lasers, quarter-wave plate (QWP), beam splitter (BS), lens, rubidium cell (heated and room temperature), 420-nm bandpass filter, photodetector (PD), and photomultiplier tube (PMT).

Image of Fig. 3.
Fig. 3.

Sample output spectrum from the heated rubidium cell taken using a StellarNet EPP2000 spectrometer. The spectrum shows the blue beam at 420 nm generated within the cell along with the incident (much stronger) laser beams at 776 nm and 780 nm. The near-IR beams were attenuated so that all three beams could be displayed on the same graph.

Image of Fig. 4.
Fig. 4.

Interference pattern of the blue beam through a double-slit aperture with slit separation of 0.25 mm. The interference pattern was monitored using a black and white CCD camera.

Image of Fig. 5.
Fig. 5.

(a) Sample PMT signal (solid line) of the “on-resonance” collimated blue beam as the 780-nm laser is scanned over the Rb (F = 3) and Rb (F = 2) ground-state transitions. The laser powers were 8.5 mW and 8.9 mW, respectively, for the 780-nm and 776-nm laser beams. The rubidium absorption spectrum of the 780-nm laser (dashed line), taken in a room temperature cell, is included for reference. (b) Collimated blue-beam power as a function of cell temperature for the “on-resonance” (squares) and “off-resonance” (circles) beam.

Image of Fig. 6.
Fig. 6.

Photodetector signals for the collimated blue beam as the 780-nm pump laser scans through the D resonance at a cell temperature of T = 87 °C. Approximate detuning (Δ) is: (i) 0 GHz, (ii) −1 GHz, (iii) −1.6 GHz, (iv) −2.9 GHz. The rubidium absorption spectrum of the 780-nm laser (upper trace), taken in a room temperature cell, is included for reference.

Image of Fig. 7.
Fig. 7.

(a) Sample photodetector signals of the “off-resonance” collimated blue beam at a variety of temperatures as the 780-nm laser is scanned over three of the rubidium hyperfine ground states. The laser powers were 21 mW and 13.8 mW, respectively, for the 780-nm and 776-nm laser beams. The rubidium absorption spectrum is included for reference. (b) Collimated blue-beam power as a function of cell temperature for the “off-resonance” beam.

Image of Fig. 8.
Fig. 8.

Blue-beam power as a function of input power of the 780-nm and 776-nm lasers for: (a) the on-resonance beam in the Mayer laboratory, (b) the off-resonance beam in the Dawes laboratory, (c) the off-resonance beam shown on a logarithmic plot.

Image of Fig. 9.
Fig. 9.

(a) Blue-beam output scan for different incident laser polarizations for the on-resonance blue beam. (b) Blue fluorescence spectra for different incident laser polarizations. (c) Blue-beam output scan for different incident laser polarizations for the off-resonance beam. The rubidium absorption spectrum is included in each figure for reference.

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/content/aapt/journal/ajp/81/6/10.1119/1.4795311
2013-05-20
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Collimated blue light generation in rubidium vapor
http://aip.metastore.ingenta.com/content/aapt/journal/ajp/81/6/10.1119/1.4795311
10.1119/1.4795311
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