Single-longitudinal-mode emission from interband cascade DFB laser with a grating fabricated by interferometric lithography

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Single-longitudinal-mode emission from interband cascade DFB laser with a grating fabricated by interferometric lithography

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A distributed-feedback, type-II interband cascade laser is demonstrated in pulsed mode, emitting near 3.145 µm at temperatures between 50 and 80 K. Feedback is provided by a surface-etched grating formed using interferometric lithography. Between 50 and 80 K, the device's single longitudinal mode red-shifts with temperature at ∼0.1 nm/K. At 70 K and 190 mA of pulsed injection current, side-mode suppression exceeds 30 dB. The characteristics of related Fabry–Perot IC lasers are also described and contrasted with those of the distributed feedback device.

Inspec keywords: red shift; Fabry-Perot resonators; distributed feedback lasers; etching; laser feedback; diffraction gratings; laser modes; quantum well lasers; optical fabrication; light interferometry; photolithography

Other keywords: device fabrication; interband cascade laser; laser feedback; DFB laser; 50 to 80 K; type-II laser; Fabry-Perot IC lasers; single-longitudinal mode emission; side-mode suppression; interferometric lithography; 190 mA; pulsed mode; surface-etched grating; distributed feedback laser; 3.145 mum; pulsed injection current; red shift

Subjects: Optical fabrication, surface grinding; Lithography (semiconductor technology); Semiconductor lasers; Design of specific laser systems; Gratings, echelles; Lasing action in semiconductors

References

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      • R.Q. Yang , J.L. Bradshaw , J.D. Bruno , J.T. Pham , D.E. Wortman . Mid-infrared type-II interband cascade lasers. IEEE J. Quantum Electron.
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      • M. Beck , D. Hofstetter , T. Aellen , J. Faist , U. Oesterle , M. Ilegems , E. Gini , H. Melchoir . Continuous wave operation of a mid-infrared semiconductor laser at room temperature. Science
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      • C. Gmachl , A. Straub , R. Colombelli , F. Capasso , D.L. Sivco , A.M. Sergent , A.Y. Cho . Single-mode, tunable distributed-feedback and multiple-wavelength quantum cascade lasers. IEEE J. Quantum Electron.
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      • R.Q. Yang , J.L. Bradshaw , J.D. Bruno , J.T. Pham , D.E. Wortman , R.L. Tober . Room temperature type-II interband cascade laser. Appl. Phys. Lett.
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