We demonstrate a continuous-wave diamond Brillouin laser (DBL) in a ring cavity, operating near 532 nm with a 167 GHz Stokes shift. The DBL is pumped by a narrow-line (<1 MHz), frequency-doubled ytterbium fiber laser with the intracavity power resonantly enhanced via Hänsch-Couillaud locking. The measured threshold enabled the Brillouin gain coefficient in diamond to be determined for the first time, yielding a value of 60 cm/GW for pump and Brillouin polarizations aligned parallel to the 〈111〉 crystallographic direction in diamond (determined by the cut of our diamond in this case). Analysis of diamond’s photoelastic tensor shows that for polarization aligned to 〈110〉 for maximum gain, a coefficient of 115 cm/GW can be deduced, the highest bulk Brillouin gain coefficient reported for any material. The high Brillouin gain coefficient in combination with outstanding optical and thermal properties, indicates great potential for realizing diamond lasers and stimulated Brillouin scattering-enabled devices of performance far exceeding other materials.
We report a second-Stokes diamond Raman laser in eye-safe wavelength capable of high power and large-scale-factor brightness enhancement. Using a quasi-continuous 1.06 μm pump of power 823 W (0.85% duty cycle) and M2 up to 6.4, a maximum output power of 302 W was obtained with an M2 = 1.1 providing an overall brightness enhancement factor of 6.0. The output power is the highest single-mode power reported for Er-doped and Raman fiber lasers (~300 W). The measurements are in good agreement with model calculations, which we use to optimize and predict performance over wider range of power and input beam quality. The results highlight a novel pathway to high brightness eye-safe lasers based on relatively incoherent 1.0–1.1 μm pumps. The concept may be adapted and extended to other wavelength regions by using other pumps or via higher-order (3+) cascading. For example, to generate high brightness red output near 0.62 – 0.67 m by using second harmonic pumps near 0.53 μm. A large number of wavelength options are conceivable as a result of the wide transparency of diamond (0.23–3.8 µm, and > 6 µm).
We present our recent advances in the field of Raman frequency conversion using high-optical quality CVD-diamond. Different diamond Raman lasers were developed for efficiently generating multi-Watt output at specific wavelengths from the visible to the eye-safe spectral range, while single-frequency operation was accomplished by exploiting an intrinsic mode stability mechanism.
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