Abstract
A multi-wavelength laser is demonstrated using a dye-doped cholesteric polymer film whose reflection bandwidth is broadened with several oscillations. Due to the abrupt change of the density of state between oscillation peak and valley, each oscillation functions as a photonic band gap for generating a laser wavelength under the excitation of a pumping laser. As a result, a multiple wavelength laser is generated. Results indicate that the dye-doped cholesteric liquid crystal polymer film is a good candidate for fabricating broadband lasers such as white light lasers. Potential applications include experimental testing of laser materials, identification markers, information displays, and inertial confinement laser fusion.
Highlights
Multi-wavelength lasers have attracted great attention [1,2,3] because of their wide range of applications, including telecommunications [4], high-precision broadband sensing and spectroscopy [5], metrology, molecular fingerprinting [6], optical clocks [7], and even attosecond physics
Multi-wavelength lasers have been demonstrated using a number of techniques including spectrum slicing in LEDs [8], amplified spontaneous emission from erbium-doped amplifiers (EDFAs) [9], supercontinuum generation in fiber [10], semiconductor optical amplifier (SOA) cavities [11,12,13], femtosecond pulses [14] as well as in erbium-doped fiber (EDF) oscillators that use a fiber Lyot [15]
The density of states (DOS) and spontaneous emission rate are suppressed within the reflection band and enhanced at the oscillation valley
Summary
Multi-wavelength lasers have attracted great attention [1,2,3] because of their wide range of applications, including telecommunications [4], high-precision broadband sensing and spectroscopy [5], metrology, molecular fingerprinting [6], optical clocks [7], and even attosecond physics. We demonstrated a multi-wavelength laser from a dye-doped cholesteric liquid crystal polymer film. Lee et al and Hands et al have obtained one- and two-dimensional spatially distributed multi-wavelength lasers in CLCs [20,21]. Multi-wavelength has been observed in CLC polymer network [24], which is due to the defects inside the sample No matter it is caused by scattering or defects, the lasing efficiency is reduced dramatically due to large optical loss. We obtained a multi-wavelength laser from a dye-doped cholesteric polymer film (CPL) based on multiple Bragg reflections [16,17]. The fabrication process of CPL is very simple It provides a possibility for obtaining high efficiency multi-wavelength lasers. The dye-doped CPL is a potential candidate for fabricating broadband lasers
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