Abstract
Narrow-linewidth sources are essential for optical systems such as coherent optical communications and optical sensors. One way of obtaining narrow linewidths is to insert the semiconductor laser into a passive external cavity containing a mirror [1, 2], a diffraction grating [1, 3–5], a GRIN rod [6], an optical fiber [7–10], or an optical fiber containing a fiber Bragg grating [11]. Linewidths of hundreds of kHz [2, 3, 6], tens of kHz [1, 3, 4, 7, 8], or even less [5, 11] have been reported for these external-cavity lasers. Almost all the reports have involved either a Fabry-Perot semiconductor laser or a DFB semiconductor laser as the active element. Furthermore, the front or rear facet emission has been used in these reports to couple the reflected light back into the laser cavity. In this paper, the use of vertical emission from a DBR laser to obtain a narrow linewidth is reported. To the authors’ knowledge, this is the first report of using vertical emission to decrease the laser linewidth in an external cavity configuration.
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Cook, A.L., Hendricks, H.D. (1995). Linewidth Reduction by the Formation of a Fiber External Cavity with the Vertical Emission of a Distributed Bragg Reflector Laser. In: Tamir, T., Griffel, G., Bertoni, H.L. (eds) Guided-Wave Optoelectronics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1039-4_15
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