Abstract
We demonstrate a two-directional tuning method of distributed feedback (DFB) film dye laser devices to achieve high quality lasing and a large tuning range. In this work, we proposed a simple method to fabricate a continuous tunable solid-state dye laser on a flexible Polydimethylsiloxane (PDMS) film. In order to obtain stable and tunable output lasing, the stretching property of the gelatine host was improved by mixing with a certain ratio of glycerol to prevent DFB cavity destruction. We employed two different tuning strategies of the DFB film dye lasers, by stretching the PDMS film in two perpendicular directions, and a nearly 40 nm tuning range in each direction was achieved. The laser device maintained single mode lasing with 0.12 nm linewidth during the tuning process. The reported tunable DFB film dye laser devices have huge potential as coherent light sources for sensing and spectroscopy applications.
Highlights
In recent years, flexible and tunable optical elements have attracted extensive interests in the emerging field of integrated optics in lab-on-a-chip applications [1,2,3]
We developed a new two-directional tuning strategy to continuously adjust the wavelength of distributed feedback (DFB) dye laser devices
We have successfully demonstrated a two-directional tuning method of DFB film dye laser devices
Summary
Flexible and tunable optical elements have attracted extensive interests in the emerging field of integrated optics in lab-on-a-chip applications [1,2,3]. Organic dye lasers have huge potential to serve as coherent visible light sources in lab-on-a-chip systems, since the organic materials have a broad gain spectrum and offer flexible tuning capabilities, which is favorable in spectroscopy and biosensing applications [4]. The output wavelength λlaser of DFB laser fulfills the Bragg equation λlaser = 2Λneff/m, where neff is the effective refractive index (RI) of the laser mode, Λ is the period of grating, and m is the Bragg order [14]. The output wavelength of a DFB laser can realize tuning by changing the effective refractive index or the grating period
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