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http://dx.doi.org/10.3807/KJOP.2006.17.3.273

A Study on the Construction of Littman and Littrow Type Tunable Diode Laser Systems  

Baek, Woon-Sik (College of Electronics and Information, Kyung Hee University)
Publication Information
Korean Journal of Optics and Photonics / v.17, no.3, 2006 , pp. 273-277 More about this Journal
Abstract
In this paper, we constructed the Littman type and fixed Littrow type tunable external-cavity diode laser systems. The laser output, which is the 0th-order diffracted beam from the diffraction grating in an external cavity, was the single longitudinal mode. Its FWHM was measured as less than 9MHz. With the diode driving current of 140mA and operating temperature of $25^{\circ}C$, the coarse tuning range of 5.375nm was measured for the Littman type, and of 13.65nm was measured for the fixed Littrow type. A fine tuning experiment in which an external mirror was rotated by a PZT driven by a sawtooth wave was performed, and its tuning range of 0.042nm was measured for both types. The fixed Littrow type tunable external-cavity diode laser system was an improvement on the conventional Littrow type tunable laser system in which the output direction varies due to the grating embedded in the mirror plate.
Keywords
Tunable laser; Optical memo; Hole burning;
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