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).
Zhenxu Bai, Robert J. Williams, Ondrej Kitzler, Soumya Sarang, David J. Spence, and Richard P. Mildren, "Large-scale brightness enhancement of quasi-continuous cascaded diamond Raman laser at eye-safe wavelength (Conference Presentation)," Proc. SPIE 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, 109021C (Presented at SPIE LASE: February 07, 2019; Published: 4 March 2019); https://doi.org/10.1117/12.2510043.6008601228001.
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