Cascaded random Raman fiber lasers (CRRFLs) have been used as a new platform for designing high power and wavelength-agile laser sources. Recently, CRRFL pumped by ytterbium-doped random fiber laser (YRFL) has shown both high power output and low relative intensity noise (RIN). Here, by using a wavelength- and bandwidth-tunable point reflector in YRFL, we experimentally investigate the impacts of YRFL on the spectral and RIN properties of the CRRFL. We verify that the bandwidth of the point reflector in YRFL determines the bandwidth and temporal stability of YRFL. It is found that with an increase in the bandwidth of the point reflector in YRFL from 0.2nm to 1.4nm, CRRFL with higher spectral purity and lower RIN can be achieved due to better temporal stability of YRFL pump. By broadening the point reflector’s bandwidth to 1.4nm, the lasing power, spectral purity, and RIN of the 4th-order random lasing at 1349nm can reach 3.03W, 96.34%, and −115.19 dB/Hz, respectively. For comparison, the spectral purity and RIN of the 4th-order random lasing with the point reflector’s bandwidth of 0.2 nm are only 91.20% and −107.99dB/Hz, respectively. Also, we realize a wavelength widely tunable CRRFL pumped by a wavelength-tunable YRFL. This work provides a new platform for the development of ideal distributed Raman amplification pump sources based on CRRFLs with both good temporal stability and wide wavelength tunability, which is of great importance in applications of optical fiber communication and distributed sensing.

级联随机拉曼光纤激光器 (CRRFL) 已被用作设计高功率和波长捷变激光源的新平台。最近，掺镱随机光纤激光器（YRFL）泵浦的CRRFL显示出高功率输出和低相对强度噪声（RIN）。在这里，通过在 YRFL 中使用波长和带宽可调的点反射器，我们通过实验研究了 YRFL 对 CRRFL 的光谱和 RIN 特性的影响。我们验证了 YRFL 中点反射器的带宽决定了 YRFL 的带宽和时间稳定性。发现随着YRFL中点反射器的带宽从0.2nm增加到1.4nm，由于YRFL泵浦具有更好的时间稳定性，可以实现具有更高光谱纯度和更低RIN的CRRFL。通过将点反射器的带宽扩大到 1.4nm，激光功率，4阶随机激光在1349nm处的光谱纯度和RIN分别可以达到3.03W、96.34%和-115.19 dB/Hz。相比之下，点反射器带宽为0.2 nm的四阶随机激光的光谱纯度和RIN分别仅为91.20%和-107.99dB/Hz。此外，我们实现了由波长可调的 YRFL 泵浦的波长广泛可调的 CRRFL。该工作为开发具有良好时间稳定性和宽波长可调性的理想分布式拉曼放大泵浦源提供了新的平台，在光纤通信和分布式传感应用中具有重要意义。点反射器带宽为0.2 nm的四阶随机激光的光谱纯度和RIN分别仅为91.20%和-107.99dB/Hz。此外，我们实现了由波长可调的 YRFL 泵浦的波长广泛可调的 CRRFL。该工作为开发具有良好时间稳定性和宽波长可调性的理想分布式拉曼放大泵浦源提供了新的平台，在光纤通信和分布式传感应用中具有重要意义。点反射器带宽为0.2 nm的四阶随机激光的光谱纯度和RIN分别仅为91.20%和-107.99dB/Hz。此外，我们实现了由波长可调的 YRFL 泵浦的波长广泛可调的 CRRFL。该工作为开发具有良好时间稳定性和宽波长可调性的理想分布式拉曼放大泵浦源提供了新的平台，在光纤通信和分布式传感应用中具有重要意义。