Gain- and feedback-channel matching in lasers based on radiative-waveguide gratings

Zhai, Tianrui

doi:10.1063/1.4757871

Cited by 9 publications

(5 citation statements)

References 13 publications

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“…The random laser emission is centered at 565 nm, and has a linewidth less than 10 nm at full width at half maximum (FWHM) in Figure 3a–c. The emission wavelength of the DFB polymer laser can be tuned by changing the period of the grating [28]. The wavelengths of the DFB lasing are 555, 566, and 571 nm for the 350, 360, and 370 nm cavity, respectively, as shown in Figure 3a–c.…”

Section: Spectra Characterization Of the Periodic-random Compound mentioning

confidence: 99%

Polymer Lasing in a Periodic-Random Compound Cavity

Zhai

et al. 2018

Polymers

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Simultaneous distributed feedback (DFB) lasing and linear polarized random lasing are observed in a compound cavity, which consists of a grating cavity and a random cavity. The grating cavity is fabricated by interference lithography. A light-emitting polymer doped with silver nanoparticles is spin-coated on the grating, forming a random cavity. DFB lasing and random lasing occur when the periodic-random compound cavity is optically pumped. The directionality and polarization of the random laser are modified by the grating structure. These results can potentially be used to design integrated laser sources.

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Section: Spectra Characterization Of the Periodic-random Compound mentioning

confidence: 99%

Polymer Lasing in a Periodic-Random Compound Cavity

Zhai

et al. 2018

Polymers

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“…Changing the shape of the grating structures provides another dimension in tuning the optical response, where rectangular [4], triangular [5], and sinusoidal [6] gratings have been demonstrated for different purposes. Such structures have been applied extensively in optical filters [7, 8], optical polarisers [9, 10], plasmonic sensors [11, 12], optical switches [13], beam splitters [14, 15], and distributed feedback (DFB) lasers [16, 17]. Waveguide grating structures have been studied extensively both experimentally and theoretically [3, 18] with a variety of applications explored in optical engineering [19] and in sensors [11, 12, 20].…”

Section: Introductionmentioning

confidence: 99%

“…We note that the waveguide resonance modes in such structures may overlap other diffraction‐ or waveguide‐related processes to enhance their optical response in intensity and in sensitivity. For instance, diffraction anomaly and Bragg diffraction may coexist with the waveguide resonance mode [16, 21]. Such overlapping or coupling effects may not only strengthen specific photophysical functions; however, also extending applications of such devices.…”

Section: Introductionmentioning

confidence: 99%

Single‐layer narrow‐band beam splitter based on a transparent grating with high‐spectral contrast and high‐angle sensitivity

Zhang

2017

Micro & Nano Letters

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A report on the polarisation beam splitter with high-angle-resolved tunability in the visible spectrum, which was achieved in a single layer of transparent thin film of indium-tin-oxide (ITO). One-dimensional grating structures were etched into an ITO layer with a designed depth using inductively coupled plasma, where the remaining ITO acts as a waveguide. Enhanced reflection of light was observed when the retro-diffraction was overlapped with the waveguide resonance mode. A beam splitting ratio of 1:1 was achieved at 532 nm at a specific incident angle. This is a stable and efficient beam splitter with high contrast and narrow-band response. It can also be applied as tunable narrow-band filters, angle sensors or optical switch.

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“…24 So, when the three periods of the scalene triangular lattice are 355 nm (Λ 1 ), 360 nm (Λ 2 ), and 365 nm (Λ 3 ), the wavelength spacing of the tri-wavelength lasing emission will be 5 nm. Thus, the scalene triangular lattice structure is a compound cavity consisting of three mor-phologically independent cavities.…”

mentioning

confidence: 99%

“…The laser wavelength will be redshifted when the period of the cavity is increased and the tuning rate (Δλ/ΔΛ) is approximately 1. 24 So, when the three periods of the scalene triangular lattice are 355 nm (Λ 1 ), 360 nm (Λ 2 ), and 365 nm (Λ 3 ), the wavelength spacing of the tri-wavelength lasing emission will be 5 nm. Clearly, polymer lasers based on single-and double-grating structures follow the same mechanism as shown in Fig.…”

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confidence: 99%

Direct writing of tunable multi-wavelength polymer lasers on a flexible substrate

2015

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Tunable multi-wavelength polymer lasers based on two-dimensional distributed feedback structures are fabricated on a transparent flexible substrate using interference ablation. A scalene triangular lattice structure was designed to support stable tri-wavelength lasing emission and was achieved through multiple exposure processes. Three wavelengths were controlled by three periods of the compound cavity. Mode competition among different cavity modes was observed by changing the pump fluence. Both a redshift and blueshift of the laser wavelength could be achieved by bending the soft substrate. These results not only provide insight into the physical mechanisms behind co-cavity polymer lasers but also introduce new laser sources and laser designs for white light lasers.

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Gain- and feedback-channel matching in lasers based on radiative-waveguide gratings

Cited by 9 publications

References 13 publications

Polymer Lasing in a Periodic-Random Compound Cavity

Polymer Lasing in a Periodic-Random Compound Cavity

Single‐layer narrow‐band beam splitter based on a transparent grating with high‐spectral contrast and high‐angle sensitivity

Direct writing of tunable multi-wavelength polymer lasers on a flexible substrate

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