Laser offset-frequency locking against energy pooling fluorescence in thermal caesium vapour

We have shown that energy pooling fluorescence lock provides an effective method for stabilizing a diode laser to a broad, stable atomic reference. We achieved typically a stable lock with a laser linewidth of 1.1 MHz and continuous tunability of ?600 MHz, against the two off-centre peaks fluorescence of 7P(3/2, 1/2) ? 6S1/2 caused by 6P3/2 + 6P3/2 ? 7P(3/2, 1/2) + 6S1/2 energy pooling collisions in thermal caesium vapour.

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