Optical frequency-domain reflectometry using rapid wavelength tuning of a Cr4+:forsterite laser.

We present a cw chromium-doped forsterite laser that permits rapid wavelength tuning over a broad bandwidth and demonstrate the application of this source to frequency-domain ranging and optical tomography. The entire tuning range of 1200 to 1275 nm can be swept in less than 500 micros . This permits frequency-domain ranging to be performed with a scan rate of 2 kHz and an axial resolution of 15 microm .

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