Threshold current analysis of distributed feed-back organic semiconductor lasers

Barlow, G.F.; Shore, K.A.

doi:10.1049/ip-opt:20010132

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…For example, Barlow et al have shown that the shape of the grating teeth can strongly affect the relative strengths of in-plane feedback and surface output coupling in a second-order DFB polymer laser and can lead to an order of magnitude change in threshold of the device. 179,196 This effect has been observed experimentally in CDFB lasers. 181 The particular materials used within the grating structure can also strongly affect performance.…”

Section: Photonic Design Of Diffractive Organic Semiconductor Lasersmentioning

confidence: 58%

“…However, other more subtle aspects of the grating structure can also have a substantial impact upon the threshold. For example, Barlow et al have shown that the shape of the grating teeth can strongly affect the relative strengths of in-plane feedback and surface output coupling in a second-order DFB polymer laser and can lead to an order of magnitude change in threshold of the device. , This effect has been observed experimentally in CDFB lasers …”

Section: 64 Photonic Design Of Diffractive Organic Semiconductor Lasersmentioning

confidence: 96%

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Organic Semiconductor Lasers

2007

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Section: Photonic Design Of Diffractive Organic Semiconductor Lasersmentioning

confidence: 58%

Section: 64 Photonic Design Of Diffractive Organic Semiconductor Lasersmentioning

confidence: 96%

Organic Semiconductor Lasers

2007

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“…The threshold gain g th of the optically pumped organic laser is assumed to be a linear function of the threshold excitation density P th as follows: where β and L are the gain coefficient and cavity length, respectively. P 0 represents the pump energy density required to reach transparency and can be assumed to be zero because the absorption of Alq 3 at the DCM emission wavelength can be mostly disregarded 15,16 . Calculating using a least-square method from Fig.…”

Section: Resultsmentioning

confidence: 99%

Optically pumped organic semiconductor laser with low temperature-cleaved mirrors

Shibamoto

Matsumoto

Takasugi

et al. 2006

Organic Light Emitting Materials and Devices X

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While preparing parallel mirrors for edge-emitting organic semiconductor lasers (OSLs) by cleaving, the edge of an organic layer is severely damaged typically by the force of cleaving the substrate. By using an organic layer hardened at a low temperature, we were able to cleave an organic layer along the facet of the substrate and reproducibly obtain smooth and parallel mirror surfaces. Slab waveguide OSL structures consisting of 200 nm-thick Alq 3 :DCM films (5% DCM) were vacuum-deposited onto polished GaAs (100) substrates coated with an 800 nm-thick layer of RF-sputtered SiO 2 . The edge facets were prepared by cleaving the OSL structures in liquid nitrogen, and the facets of the organic layers were evaluated by scanning electron microscope. The samples were optically pumped using a nitrogen laser (λ=337 nm) with 600 ps pulse width at a 20 Hz repetition rate. The typical threshold power density was 68 µJ/cm 2 in the sample with about a 10 mm cavity length. The lasing peak wavelength was 644.5 nm. The full width at half maximum of the photoluminescence spectrum, dependence of light output power on input power, directional characteristics and polarization characteristics were measured. Our method is very useful to realize electrically pumped edge emitting OSLs.

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“…Under external optical feedback, the photons back to the laser cavity will stimulate further photon emission and lower the threshold current, which is good to enhance the measurement sensitivity. The threshold current of QCL under the effect of external optical feedback, I th,OF , can be precisely calculated through [31,32] I th,OF =…”

Section: Effect Of Optical Feedback On Threshold Current Of Lasermentioning

confidence: 99%

Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field

Chen¹,

Wan²,

Zou³

et al. 2015

Chinese Phys. B

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In this paper, the frequency-locking and threshold current-lowering effects of a quantum cascade laser are studied and achieved. Combined with cavity-enhanced absorption spectroscopy, the noninvasive detection of H2 with a prepared concentration of 500 ppm in multiple dissolved gases is performed and evaluated. The high frequency selectivity of 0.0051 cm−1 at an acquisition time of 1 s allows the sensitive detection of the (1-0) S(1) band of H2 with a high accuracy of (96.53±0.29)% and shows that the detection limit to an absorption line of 4712.9046 cm−1 is approximately (17.26±0.63) ppm at an atmospheric pressure and a temperature of 20 °C.

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Threshold current analysis of distributed feed-back organic semiconductor lasers

Cited by 6 publications

References 11 publications

Organic Semiconductor Lasers

Organic Semiconductor Lasers

Optically pumped organic semiconductor laser with low temperature-cleaved mirrors

Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field

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