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Measurement of laser heating in spin exchange optical pumping by NMR diffusion sensitization gradients
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Image of FIG. 1.
FIG. 1.

Schematic showing (a) the various hardware and software functions of the spectrometer, the software functions are indicated in light gray and the hardware dark gray. The experimental setup is shown in (b), this shows specifically the laser, holding field , gradient coils, and volume transmit/receive coil in the oven.

Image of FIG. 2.
FIG. 2.

Schematic showing the pulse sequence used for (a) gradient recalled echo and (b) diffusion sensitization gradients. In the all cases the length while the ramp time was 0.5 ms.

Image of FIG. 3.
FIG. 3.

Typical data for the diffusion sensitization plots for low pressure cell 1 (closed circles) and higher pressure cell 3 (open circles).

Image of FIG. 4.
FIG. 4.

Cell 3 data: (a) transmitted laser power measured as a function of cell temperature. (b) Temperature dependence of the measured diffusion coefficient measured in situ in the oven with the laser off (closed points) and on (open points). Lines are calculations from Chapman–Enskog theory, (i) taking into account only the explicit temperature dependence and (ii) the temperature and cell pressure dependence. Calculation assumes pressures of and at room temperature. (c) Comparison of oven temperature and cell temperature converted from the measured diffusion coefficient. Line is for no heating.

Image of FIG. 5.
FIG. 5.

(a) Flip angle profile (open triangles) of the spherical cell (cell 3), with cell profile from the gradient echo shown (closed circles). Inset figure showing end on views of the transmit/receive coil showing angle as in Sec. VI. (b) Spatially localized measurement of diffusion coefficient of cell 2 at showing spatial distribution of across the cell.


Generic image for table
Table I.

Cell parameters, pressures are as measured by neutron transmission, measured using pulse-acquire NMR at room temperature .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurement of laser heating in spin exchange optical pumping by NMR diffusion sensitization gradients