Experimental setup showing the PID control, the heater, the quartz tube, and the glass injection system. L: live, N: neutral, F1: fuse, PID: proportional, integral, and derivative, TFR: step down transformer, SSR: solid state relay.
A photograph of the vertical tube furnace.
(a) Image of the microspheres made in the tube furnace, the largest sphere in the image is . (b) microsphere laser pumped via a tapered optical fiber around 978 nm. The WGM is clearly evident and the tapered fiber coupler is in contact with the microsphere and at the top.
Single mode lasing at 1532 nm from a IOG-2 microsphere pumped at 978 nm. Typical observed lasing thresholds are . Inset: WGM fluorescence from the same microsphere.
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