Frequency Stabilization of AlGaAs Semiconductor Laser to the Absorption Line of Water Vapor

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<jats:p> The absorption spectrum of water vapor in the (2, 1, 1) vibration-rotation band has been observed by using an AlGaAs semiconductor laser around 0.82 µm. The laser frequency was stabilized to one of the absorption lines by controlling the injection current. A frequency stability of 1.9×10<jats:sup>-9</jats:sup>≧σ≧1.1×10<jats:sup>-11</jats:sup> was obtained for 10 ms≦τ≦500 s. </jats:p>

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