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Sample Grating Distributed Feedback Quantum Cascade Laser Array.

Yan FL, Zhang JC, Liu CW, Zhuo N, Liu F, Zhai SQ, Wang ZG - Nanoscale Res Lett (2015)

Bottom Line: A sample grating distributed feedback quantum cascade laser array aim at broad tunability and enhanced side mode suppression ratios is presented.Utilizing a sample grating dependence on emission wavelength and epitaxial side down bonding technique, the array of laser ridges exhibited three separated single mode emissions centered at 4.760, 4.721, and 4.711 μm respectively, in continuous wave at room temperature.Side mode suppression ratios of >35 dB and continuous wave output powers of >10 mW per laser ridge were obtained.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China. flyan2012@semi.ac.cn.

ABSTRACT
A sample grating distributed feedback quantum cascade laser array aim at broad tunability and enhanced side mode suppression ratios is presented. Utilizing a sample grating dependence on emission wavelength and epitaxial side down bonding technique, the array of laser ridges exhibited three separated single mode emissions centered at 4.760, 4.721, and 4.711 μm respectively, in continuous wave at room temperature. Side mode suppression ratios of >35 dB and continuous wave output powers of >10 mW per laser ridge were obtained.

No MeSH data available.


Related in: MedlinePlus

The spectrum of all three lasers in the array and the injected currents keep at 1.2 Ith in CW mode at 20 °C. Inset (a) and inset (b) the spectrum of no. 2 in the array with current changing from 170 to 200 mA at 20 °C and with the temperature changing from 5–25 °C at 200 mA, respectively
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Fig3: The spectrum of all three lasers in the array and the injected currents keep at 1.2 Ith in CW mode at 20 °C. Inset (a) and inset (b) the spectrum of no. 2 in the array with current changing from 170 to 200 mA at 20 °C and with the temperature changing from 5–25 °C at 200 mA, respectively

Mentions: The emission spectrum of the array was measured using a Fourier transform infrared spectrometer (Nicolet 6700) with a resolution of 0.25 cm−1. Figure 3 shows all three DFB ridges in the array operating in single mode at the injected current of 1.2 Ith (threshold current). The measured wavelength of the DFB ridges in the array are 4.760 μm (designed at 4.800 μm), 4.721 μm (4.740 μm), and 4.711 μm (4.720 μm), which locate slightly left to the center of the designed +1st order Bragg modes. The reason is that we have overestimated the effective refractive index neff ~3.20, which is about 3.19 according to the measurement results. Such a high SMSR benefits from (i) the use of +1st Fourier spectrum sampled grating as mode selection mechanism, which is not affected by defect in the based Bragg grating region and (ii) the sample grating DFB lasers are much less sensitive to the facet phase effects than standard DFB lasers [7]. The temperature tuning coefficient of laser 2 is about 0.15 cm−1/K, which is comparable to conventional DFB lasers.Fig. 3


Sample Grating Distributed Feedback Quantum Cascade Laser Array.

Yan FL, Zhang JC, Liu CW, Zhuo N, Liu F, Zhai SQ, Wang ZG - Nanoscale Res Lett (2015)

The spectrum of all three lasers in the array and the injected currents keep at 1.2 Ith in CW mode at 20 °C. Inset (a) and inset (b) the spectrum of no. 2 in the array with current changing from 170 to 200 mA at 20 °C and with the temperature changing from 5–25 °C at 200 mA, respectively
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608948&req=5

Fig3: The spectrum of all three lasers in the array and the injected currents keep at 1.2 Ith in CW mode at 20 °C. Inset (a) and inset (b) the spectrum of no. 2 in the array with current changing from 170 to 200 mA at 20 °C and with the temperature changing from 5–25 °C at 200 mA, respectively
Mentions: The emission spectrum of the array was measured using a Fourier transform infrared spectrometer (Nicolet 6700) with a resolution of 0.25 cm−1. Figure 3 shows all three DFB ridges in the array operating in single mode at the injected current of 1.2 Ith (threshold current). The measured wavelength of the DFB ridges in the array are 4.760 μm (designed at 4.800 μm), 4.721 μm (4.740 μm), and 4.711 μm (4.720 μm), which locate slightly left to the center of the designed +1st order Bragg modes. The reason is that we have overestimated the effective refractive index neff ~3.20, which is about 3.19 according to the measurement results. Such a high SMSR benefits from (i) the use of +1st Fourier spectrum sampled grating as mode selection mechanism, which is not affected by defect in the based Bragg grating region and (ii) the sample grating DFB lasers are much less sensitive to the facet phase effects than standard DFB lasers [7]. The temperature tuning coefficient of laser 2 is about 0.15 cm−1/K, which is comparable to conventional DFB lasers.Fig. 3

Bottom Line: A sample grating distributed feedback quantum cascade laser array aim at broad tunability and enhanced side mode suppression ratios is presented.Utilizing a sample grating dependence on emission wavelength and epitaxial side down bonding technique, the array of laser ridges exhibited three separated single mode emissions centered at 4.760, 4.721, and 4.711 μm respectively, in continuous wave at room temperature.Side mode suppression ratios of >35 dB and continuous wave output powers of >10 mW per laser ridge were obtained.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China. flyan2012@semi.ac.cn.

ABSTRACT
A sample grating distributed feedback quantum cascade laser array aim at broad tunability and enhanced side mode suppression ratios is presented. Utilizing a sample grating dependence on emission wavelength and epitaxial side down bonding technique, the array of laser ridges exhibited three separated single mode emissions centered at 4.760, 4.721, and 4.711 μm respectively, in continuous wave at room temperature. Side mode suppression ratios of >35 dB and continuous wave output powers of >10 mW per laser ridge were obtained.

No MeSH data available.


Related in: MedlinePlus