Wavelength Tunability of Plastic Waveguide Laser With Asymmetric Distributed Bragg Reflectors

Abstract

A wavelength tunable plastic laser with asymmetric distributed Bragg reflectors (DBRs) is proposed. This device consists of a pair of long-period waveguide gratings and a polymeric active waveguide doped with an organic dye. Due to the difference in grating periods between the two DBRs, the lasing wavelength can be tuned in accordance with a Vernier effect of the resonance between the reflection wavelengths. The plastic laser device operated with this principle has promise as a compact and widely tunable light source because a large wavelength shift in a wide emission band of an organic luminescent material can be expected with a small variation in the effective index.Index Terms-Distributed Bragg reflector, plastic laser, wavelength tuning.

An Efficient All‐Plastic Organic Waveguide Solid‐State Laser Devices with Distributed Bragg Reflector

“…Compared with great number of studies have been reported for organic dye and polymer laser devices with DFB resonator, only a few studies for those with DBR have been reported . Recent paper reports the diffraction‐limited lasing spot by utilizing the 2D DBR cavity .…”

“…[18] Compared with great number of studies have been reported for organic dye and polymer laser devices with DFB resonator, only a few studies for those with DBR have been reported. [19][20][21][22] Recent paper reports the diffraction-limited lasing spot by utilizing the 2D DBR cavity. [23] In more recent report, by the combination of the holographic volume Bragg grating with a vertical external cavity architecture, solution-processed organic dye laser achieved the linewidth of 200 MHz (0.26 pm) with 20 ns long pump pulse, which is unprecedented coherence length of 1 m. [24] In our former study, [19] lasing threshold was compared for the waveguide laser devices of Alq 3 /3-(2-benzothiazolyl)-7-(diethylamino)-coumarin (Coumarin 6) host-guest dispersed in poly(vinyl butyral) (PVB) (PVB/Alq 3 /Coumarin 6 host-guest system) with DFB resonator and DBR region.…”