In order to couple the diode laser radiation into the PM-SMF, the beam is first collimated and then focused onto the facet of the optical fiber. The fiber facets are uncoated which results in Fresnel losses on both sides of the fiber.
#935 optical isolator Patch#
The custom made 2 m long fiber patch cable is equipped with a bare ZrO 2 ferrule at the input and a standard FC/APC connector at the output. Finally, a brief summary and conclusions are provided at the end of this manuscript.Īs PM-SMF the PM980-XP model from Nufern with a core diameter of 5.5 μm and an NA of 0.12 is applied. 3, the experimental results achieved with the developed laser light source are presented, inclucing the electro-optical characteristics as well as the spectral, spatial and polarization properties of the generated laser beam. 2 the design and fabrication of the module is discussed in detail, which comprises the description of its key components, its mechanical and optical design as well as the employed assembly strategy. The manuscript is organized as follows: in Sec. 4 The high polarization extinction ratio (PER) of the generated radiation is achieved by an active alignment of the polarization-maintaining single-mode fiber (PM-SMF) during the assembly process. In order to ensure a stable spectral emission and a narrow spectral linewidth an optical micro-isolator is integrated in the module analogous to Ref. In this work, a concept of a fiber-coupled diode laser module derived from our prior experience in this field 5 is introduced. Several approaches of this kind have been proposed in the past. However, for their unrestricted use and straight-forward integration a proper housing and a fiber output are indispensable.
1 Diode lasers are promising laser light sources for such applications due their robustness, compactness and high efficiency. In particular, devices emitting around 1116 nm are required as seed lasers for innovative LIDAR systems. in the fields of spectroscopy or metrology. Efficient laser light sources in continuous-wave (CW) operation generating single-frequency, near-infrared radiation in a spatial fundamental mode are desired for various applications, e.g.
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