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A passively Q-switched Er-doped fiber laser using a simple and cost-effective saturable absorber (SA) of alcohol has been demonstrated. The SA is made through filling anhydrous alcohol in the gap between the end-facets of two optical patch cords, which are inserted into a cannula. The modulation depth of the SA with 820-μm alcohol layer is measured to be 18%. Based on such an SA, the Q-switching operation...
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