High-performance continuous wave quantum cascade lasers with widely spaced operation frequencies (original) (raw)
Proceedings of SPIE vol. 6485
Room temperature, continuous wave (CW) operation of distributed feedback (DFB) quantum cascade lasers with widely spaced operation frequencies is reported. The relatively small temperature tuning range of a single device, smaller or equal to approximately 1 % of the wavelength, usually limits their efficiency for spectroscopic investigations. By using a bound-to-continuum active region to create a broad gain spectrum and monolithic integration of different DFB gratings, we achieved high-performance devices with single-mode emission between 7.7 and 8.3 m at a temperature of +30 °C. This frequency span corresponds to 8 % of the center frequency. The maximum CW operation temperature achieved was 63 °C at the gain center and as much as 35 °C and 45 °C, respectively, at the limits of the explored wavelength range.
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Room-temperature continuous wave quantum cascade lasers with widely spaced operation frequencies
Novel In-Plane Semiconductor Lasers VI, 2007
Room temperature, continuous wave (CW) operation of distributed feedback (DFB) quantum cascade lasers with widely spaced operation frequencies is reported. The relatively small temperature tuning range of a single device, smaller or equal to approximately 1 % of the wavelength, usually limits their efficiency for spectroscopic investigations. By using a bound-to-continuum active region to create a broad gain spectrum and monolithic integration of different DFB gratings, we achieved high-performance devices with single-mode emission between 7.7 and 8.3 mum at a temperature of +30 °C. This frequency span corresponds to 8 % of the center frequency. The maximum CW operation temperature achieved was 63 °C at the gain center and as much as 35 °C and 45 °C, respectively, at the limits of the explored wavelength range.
Proceedings of Spie the International Society For Optical Engineering, 2007
ABSTRACT Room temperature, continuous wave (CW) operation of distributed feedback (DFB) quantum cascade lasers with widely spaced operation frequencies is reported. The relatively small temperature tuning range of a single device, smaller or equal to approximately 1 % of the wavelength, usually limits their efficiency for spectroscopic investigations. By using a bound-to-continuum active region to create a broad gain spectrum and monolithic integration of different DFB gratings, we achieved high-performance devices with single-mode emission between 7.7 and 8.3 μm at a temperature of +30 °C. This frequency span corresponds to 8 % of the center frequency. The maximum CW operation temperature achieved was 63 °C at the gain center and as much as 35 °C and 45 °C, respectively, at the limits of the explored wavelength range.
Recent advances in continuous wave quantum cascade lasers
Proceedings of the 29th International Symposium on Compound Semiconductors, IOP vol. 174
Continuous wave (CW) operation of quantum cascade lasers is reported up to a temperature of 312 K. The junction down mounted devices were designed as buried heterostructure lasers with high-reflection coatings on both facets. This resulted in CW operation at an emission wavelength of 9.1 µm with an optical power ranging from 17 mW at 293 K to 3 mW at 312 K. A distributed feedback type device was fabricated and tested as well. It showed CW singlemode operation up to 260 K. These results demonstrate the potential of quantum cascade lasers as CW mid-infrared light sources for high-resolution spectroscopy and free space telecommunication systems.
High Performance Quantum Cascade Lasers and Their Applications
Topics in Applied Physics vol. 89, 2003
This chapter describes our results on distributed feedback quantum cascade lasers in the wavelength range around 5 µm and around 10 µm. We present two different gain region designs; one with three quantum wells and one with a double phonon resonance. Several fabrication techniques are also presented and analysed in terms of fabrication simplicity, performance, yield, and reliability. We will outline typical results for all devices and also show some interesting applications. In light of this, the chapter is organized as follows: We start with a brief introduction ; in Sect. 2, the advantages and drawbacks of the different gain regions are outlined; Sect. 3 deals with the fabrication technology which was required to build these lasers; in Sect. 4, we present the measurement results on the devices; and finally, Sect. 5 describes two examples of interesting applications in the fields of optical spectroscopy and optical data transmission. The chapter ends with a brief conclusion and an outlook.
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