Performance comparison of gain-coupled and index-coupled DFB semiconductor lasers

Lowery, Arthur J.; Novak, D.

doi:10.1109/3.309864

Cited by 46 publications

(6 citation statements)

References 39 publications

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“…The feedback gain G is the product of the coupling coefficient and the resonance length of the micro-cavity L 25 26 27 . L increases linearly with the diffraction mode for lasing m .…”

Section: Resultsmentioning

confidence: 99%

Re-evaluation of all-plastic organic dye laser with DFB structure fabricated using photoresists

Tsutsumi

Nagi

Kinashi

et al. 2016

Sci Rep

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Organic solid-state lasers (OSSLs) with distributed feedback structures can detect nanoscale materials and therefore offer an attractive sensing platform for biological and medical applications. Here we investigate the lasing characteristics, i.e., the threshold and slope efficiency, as a function of the grating depth in OSSL devices with distributed feedback (DFB) structure fabricated using photoresists. Two types of photoresists were used for the DFB structures: a negative photoresist, SU-8 2002, and a positive photoresist, ma-P 1275. The DFB structure was fabricated using a Lloyd-mirror configuration. The active layer was a rhodamine 6G-doped cellulose acetate waveguide. The threshold for the first order mode (m = 1) was lower than that for the second and third order modes (m = 2, and 3). A low threshold of 27 μJ cm−2 pulse−1 (58 nJ) was obtained using SU-8 2002, with m = 1. The slope efficiency was evaluated as a function of grating depth for each mode and increased as the grating depth increased.

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“…The feedback gain G is the product of the coupling coefficient and the resonance length of the micro-cavity L 25 26 27 . L increases linearly with the diffraction mode for lasing m .…”

Section: Resultsmentioning

confidence: 99%

Re-evaluation of all-plastic organic dye laser with DFB structure fabricated using photoresists

Tsutsumi

Nagi

Kinashi

et al. 2016

Sci Rep

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“…The description of noise in these lasers requires solving coupled ordinary differential equations with random noise sources. This has been done analytically (Olesen et al, 1993;Tromborg et al, 1994) and by computer simulation (Lowery and Novak, 1994;Marcenac and Carroll, 1994).…”

Section: B Practical Treatments Of Quantum Noisementioning

confidence: 98%

Quantum noise in photonics

Henry¹,

Kazarinov²

1996

Rev. Mod. Phys.

162

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The basic equations governing noise phenomena are derived from first principles and applied to examples in optical communications. Quantum noise arises from two sources, the momentum fluctuations of electrons at optical frequencies and the uncertainty-related fluctuations of the electromagnetic field. Shot noise results from the beating of the noise sources with the signal field. In high-gain amplifiers, the spontaneous-emission noise dominates shot noise and results in a noise figure of at least 3 dB. It is shown explicitly how, at high power, both the laser field and the laser noise source become classical. The increase in noise in lasers with open cavities is not due to enhanced spontaneous emission as once thought, but to single-pass amplification. The noise fields and spontaneous currents have Gaussian distributions, while nonlasing modes have exponential photon-number distributions. Low-frequency intensity fluctuations arise from the electric current driving the laser and can be sub-Poissonian, in contrast to shot noise, which has a Poissonian distribution. The calculational tools are a wave equation for the field operator and a rate equation for the carrier-number operator, each containing spontaneous current noise sources. The correlation functions of these sources are determined by the fluctuation-dissipation theorem.[S0034-6861(96)00503-X]

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“…Deviating from the DFB theory [21,22], where two laser modes near the Bragg wavelength are generated due to the symmetry of the gratings in index-coupled DFB-lasers [23], we could only measure one laser line out of our waveguide integrated lasers. We suppose that this effect can be addressed to the replication process of the Bragg grating structure into the polymeric cladding layer.…”

Section: Resultsmentioning

confidence: 99%

Single-Mode Polymer Ridge Waveguide Integration of Organic Thin-Film Laser

et al. 2020

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Organic thin-film lasers (OLAS) are promising optical sources when it comes to flexibility and small-scale manufacturing. These properties are required especially for integrating organic thin-film lasers into single-mode waveguides. Optical sensors based on single-mode ridge waveguide systems, especially for Lab-on-a-chip (LoC) applications, usually need external laser sources, free-space optics, and coupling structures, which suffer from coupling losses and mechanical stabilization problems. In this paper, we report on the first successful integration of organic thin-film lasers directly into polymeric single-mode ridge waveguides forming a monolithic laser device for LoC applications. The integrated waveguide laser is achieved by three production steps: nanoimprint of Bragg gratings onto the waveguide cladding material EpoClad, UV-Lithography of the waveguide core material EpoCore, and thermal evaporation of the OLAS material Alq3:DCM2 on top of the single-mode waveguides and the Bragg grating area. Here, the laser light is analyzed out of the waveguide facet with optical spectroscopy presenting single-mode characteristics even with high pump energy densities. This kind of integrated waveguide laser is very suitable for photonic LoC applications based on intensity and interferometric sensors where single-mode operation is required.

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Performance comparison of gain-coupled and index-coupled DFB semiconductor lasers

Cited by 46 publications

References 39 publications

Re-evaluation of all-plastic organic dye laser with DFB structure fabricated using photoresists

Re-evaluation of all-plastic organic dye laser with DFB structure fabricated using photoresists

Quantum noise in photonics

Single-Mode Polymer Ridge Waveguide Integration of Organic Thin-Film Laser

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