Broadband lasers oscillating in multiple longitudinal modes have potential applications on high resolution interferometer, optical communication and laser spectroscopy. However, the bandwidth of the laser spectrum is limited by the spectral range of laser materials. Here, a broadband multi-longitudinal-mode laser with bandwidth of 22.4 nm at first-order Stokes wavelength has been achieved in a Yb:YAG/YVO 4 Raman microchip laser pumped with a quasi-continuous-wave laser-diode. The output energy is 11.6 mJ at pump energy of 34.4 mJ, and the optical efficiency is 34%. Dramatically expanding multi-longitudinal-mode laser spectrum has been achieved by forming Yb:YAG/YVO 4 coupled Raman microchip laser with an external Fabry–Perot mirror to manipulate the output coupling losses at different frequencies for fundamental, first-order and second-order Stokes lasers. The bandwidth of the broadband multi-longitudinal-mode laser is 55.4 nm, which covers from 1041 nm to 10...

中文翻译：

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宽带多纵向模式Yb：YAG / YVO 4耦合拉曼微芯片激光器

以多个纵向模式振荡的宽带激光器在高分辨率干涉仪，光通信和激光光谱学上具有潜在的应用。但是，激光光谱的带宽受到激光材料光谱范围的限制。在这里，在准连续波激光二极管泵浦的Yb：YAG / YVO 4拉曼微芯片激光器中，已经实现了在第一阶斯托克斯波长处具有22.4 nm带宽的宽带多纵向模式激光器。在34.4 mJ的泵浦能量下，输出能量为11.6 mJ，光学效率为34％。通过使用外部Fabry-Perot反射镜形成Yb：YAG / YVO 4耦合拉曼微芯片激光器来控制不同频率下的输出耦合损耗，从而实现了大幅扩展的多纵模激光光谱。一阶和二阶斯托克斯激光器。宽带多纵向模式激光器的带宽为55.4 nm，覆盖1041 nm至10 ...