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Cheng, Wood-Hi; Chiu, Shao-Jung; Hong, Chang Won; Chang, Hung‐Wen

doi:10.1023/a:1007044320912

Cited by 19 publications

(2 citation statements)

References 4 publications

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“…Therefore, the SMSR of FGECSL can be studied by using Eqs. ( 6) and (7). For the structure of FGECSL, the high reflectivity of FBG increases the photon density of first mode S 0 , and decreases the photon density of the other mode S m .…”

Section: Smsr Of Fgecslmentioning

confidence: 98%

980 nm fiber grating external cavity semiconductor lasers with high side mode suppression ratio and high stable frequency

Guo¹,

Manqing²,

Jiao³

et al. 2014

J. Semicond.

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Section: Smsr Of Fgecslmentioning

confidence: 98%

980 nm fiber grating external cavity semiconductor lasers with high side mode suppression ratio and high stable frequency

Guo¹,

Manqing²,

Jiao³

et al. 2014

J. Semicond.

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“…The interaction between the internal cavity and the external cavity changes spectral modes in the coupling cavity and causes the oscillating performance of modes to diminish with the increasing R 2 . 26 The beam with the side spectral mode deviates from that with the main spectral mode, which ultimately degrades the beam quality and amplifies the spot size. Figure 9(b) indicates the variation of spot size with the propagation distance for different reflectivities.…”

Section: Simulation and Analysismentioning

confidence: 99%

Spectral-combined beam characteristics based on external cavity feedback diode laser array

Zhang

Cai

et al. 2023

Opt. Eng.

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In spectral beam combining systems, the locked spectra of the diode laser array are determined by the interaction between the internal cavity and the external cavity. Using the multibeam interference theory, spectral modes locked by the coupled cavity are numerically calculated and analyzed. A spectral mode of a diode emitter is divided into a main lobe, a left sidelobe, and a right sidelobe, which is mainly affected by the position of the diode emitter. Based on the locked spectral modes, a beam propagation model in the grating-external cavity is established by the diffraction integral method and the incoherent superposition principle. The effects of the interval between two adjacent emitters, the reflectivity of the front surface, and the distance between the grating and the coupler on the characteristics of the combined beam have been discussed in detail. The results show that the beam quality and the spot size of the combined beam gradually degrade with the increasing interval. By reducing the reflectivity of the front surface of the diode emitter and decreasing the distance between the grating and the coupler, the beam quality can be improved. Among the three factors, such as the interval between two adjacent emitters, the reflectivity of the front surface of an emitter, and the diffraction distance, the interval has the most sensitive impact on the combined beam characteristics. Thus a beam shrinker to convert big beams into small beams in diameter can be adopted to optimize the combined beam.

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Low-threshold performance of fiber Bragg grating external-cavity semiconductor lasers using genetic algorithms

Huang

2008

Opt Quant Electron

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The lowest threshold current of the external-cavity semiconductor laser with fiber Bragg grating using genetic algorithms is investigated. Effects of the external cavity length, coupling efficiency and anti-reflection coating reflectivity on static characteristics, such as L-I curves and side mode suppression ratios (SMSR) are investigated by using multi-mode rate equation. It is found that the reflectivity of the anti-reflection coating for low-threshold performance needs to be increased at the cost of the stability of the fiber grating externalcavity semiconductor laser. The optimal external cavity length obtained by genetic algorithms can be used to obtain the lowest threshold current for sacrificing a little SMSR. However, with the decrease of AR-coating reflectivity, output powers and SMSRs are slightly dependent on the external cavity length.

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Untitled

Cited by 19 publications

References 4 publications

980 nm fiber grating external cavity semiconductor lasers with high side mode suppression ratio and high stable frequency

980 nm fiber grating external cavity semiconductor lasers with high side mode suppression ratio and high stable frequency

Spectral-combined beam characteristics based on external cavity feedback diode laser array

Low-threshold performance of fiber Bragg grating external-cavity semiconductor lasers using genetic algorithms

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