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85 results on '"Maute, M."'

34. Simultaneous Spectroscopy of NH3 and CO Using a > 50 nm Continuously Tunable MEMS-VCSEL.

Author

Kogel, B., Halbritter, H., Jatta, S., Maute, M., Bohm, G., Amann, M.-C., Lackner, M., Schwarzott, M., Winter, F., and Meissner, P.

Abstract

A fiber-based remote measurement setup for tunable diode laser absorption spectroscopy, introducing an electrically pumped, micromechanical vertical-cavity surface-emitting laser with single-mode emission spectrum, narrow linewidth of 40 MHz, and broadband, continuous wavelength coverage of 51 nm around 1.55 mum is presented. The tunable laser spectrometer is employed for analysis of heterogeneous gas compositions and simultaneous detection of two species, ammonia and carbon monoxide, in a single continuous wavelength sweep. Broadband absorbance spectra are captured at elevated temperatures up to 300 degC revealing opposed temperature dependencies for selected transitions. [ABSTRACT FROM PUBLISHER]

Published
2007
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36. Long-wavelength MEMS tunable vertical-cavity surface-emitting lasers with high sidemode suppression

Author

Kögel, B, Maute, M, Halbritter, H, Riemenschneider, F, Böhm, G, Amann, M-C, and Meissner, P

Abstract

We present a micromechanically tunable long-wavelength vertical-cavity surface-emitting laser with a buried tunnel junction aperture and a stable half-symmetric cavity for full mode control. The conjunction of the active part 'half-VCSEL' and the curved MEMS-mirror in a two-chip assembly enables high output power singlemode emission exceeding 1 mW. Electrothermal actuation of the micromechanical chip allows us to extend the single wavelength performance to a continuously tunable, selectively wavelength-addressable spectrum of 28 nm. The concave curvature and the resulting long air-gap cavity are designed to favour the resonance of the fundamental mode, i.e. to match the phase front predicted by Gaussian beam theory corresponding to the aperture diameter of 10 µm. The spatial beam profile of the MEMS-VCSEL is measured in the far-field and compared with a conventional VCSEL with a fixed plane top mirror. The polarization is controlled by a dominating mirror asymmetry. High sidemode suppression over the whole tuning range with respect to both the transverse modes (>40 dB) and the polarization modes (>30 dB) is demonstrated.

Published
2006
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38. Chirp and linewidth enhancement factor of 1.55 µm VCSEL with buried tunnel junction.

Author

Halbritter, H., Shau, R., Riemenschneider, F., Kögel, B., Ortsiefer, M., Rosskopf, J., Böhm, G., Maute, M., Amann, M.-C., and Meissner, P.

Subjects
OPTOELECTRONIC devices, LASERS, OPTICS, LASER transitions, ELECTRONIC equipment, ELECTRONICS
Abstract

Chirp characteristics of a 1.55 μm vertical-cavity surface-emitting laser (VCSEL) employing a buried tunnel junction are reported for the first time. From the measurements the linewidth enhancement factor αH is derived and presented. [ABSTRACT FROM AUTHOR]

Published
2004
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40. Spectral and modulation properties of a largely tunable MEMS-VCSEL in view of gas phase spectroscopy applications

Author

Schilt, Stéphane, Zogal, K., Kögel, B., Meissner, P., Maute, M., Protasio, R., Amann, M.-C., Schilt, Stéphane, Zogal, K., Kögel, B., Meissner, P., Maute, M., Protasio, R., and Amann, M.-C.

Abstract

An extensive characterization of the spectral properties of a largely tunable laser in the 1.56-μm spectral range is reported. This device combines a vertical-cavity surface-emitting laser (VCSEL) with a micro-machined (MEMS) Bragg mirror in a very compact arrangement. The large tunability obtained by an electro-thermal actuation of the MEMS mirror makes this device very attractive for high-resolution spectroscopy. Relevant laser parameters for the implementation of wavelength modulation spectroscopy techniques in gas sensing, such as tuning and modulation properties, are presented. A preliminary gas spectroscopy experiment performed with this laser is also shown.

49. High singlemode output power from long-wavelength VCSELs using curved micromirrors for mode control.

Author

Kögel, B., Maute, M., Halbritter, H., Jatta, S., Böhm, G., Amann, M. -C., and Meissner, P.

Subjects
*NONLINEAR optics, *OPTOELECTRONIC devices, *LIGHT sources, *LASERS, *MIRRORS, *POLARIZABILITY (Electricity)
Abstract

Concave curved micro-mirrors enable record high 2.8 mW singlemode emission from long-wavelength vertical-cavity surface-emitting lasers with large current apertures up to 12 μm. Higher-order transverse modes are suppressed by more than 48 dB, while polarisation control by a dominating mirror asymmetry is demonstrated after coupling 1.9 mW into a singlemode fibre. [ABSTRACT FROM AUTHOR]

Published
2005
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50. Linewidth of InP-based 1.55 µm VCSELs with buried tunnel junction.

Author

Shau, R., Haibritter, H., Riemenschneider, F., Ortsiefer, M., Rosskopf, J., Böhm, G., Maute, M., Meissner, P., and Amann, M.-C.

Subjects
LASERS, ESTIMATION theory, SPECTRUM analysis, RESEARCH
Abstract

Spectral linewidth measurements of 1.55 μm InGaAlAs/InP vertical-cavity surface-emitting lasers (VCSELs) employing a buried tunnel junction are reported. A narrow linewidth around 28 MHz was obtained at a power level of 0.5 mW using the self-heterodyne method, and an estimation for the linewidth enhancement factor is given. [ABSTRACT FROM AUTHOR]

Published
2003
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