Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/151336
Title: Heterodyne Spectroscopy of Frequency Instabilities in Terahertz Quantum-Cascade Lasers Induced by Optical Feedback
Authors: Heinz-Wilhelm H&x00FC;bers;Heiko Richter;Ren&x00E9; Eichholz;Martin Wienold;Klaus Biermann;Lutz Schrottke;Holger T. Grahn
Year: 2017
Publisher: IEEE
Abstract: We study the influence of optical feedback on the frequency stability of terahertz (THz) quantum-cascade lasers (QCLs) by high-resolution heterodyne spectroscopy. The emission from two pairs of QCLs operating either at 3.4 or at 4.7 THz is mixed in a Schottky diode and the resulting difference frequency in the gigahertz range is measured. The high spectral resolution of less than 1 MHz and a time resolution of 1 ms enable us to investigate feedback-induced frequency instabilities on scales that are relevant for spectroscopy. Frequency changes of up to 70 MHz are observed with an optical feedback of only 3 &x00D7; 10<sup>-5</sup> of the output power of the QCL.
URI: http://localhost/handle/Hannan/151336
volume: 23
issue: 4
More Information: 1,
6
Appears in Collections:2017

Files in This Item:
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7880573.pdf883.78 kBAdobe PDF
Title: Heterodyne Spectroscopy of Frequency Instabilities in Terahertz Quantum-Cascade Lasers Induced by Optical Feedback
Authors: Heinz-Wilhelm H&x00FC;bers;Heiko Richter;Ren&x00E9; Eichholz;Martin Wienold;Klaus Biermann;Lutz Schrottke;Holger T. Grahn
Year: 2017
Publisher: IEEE
Abstract: We study the influence of optical feedback on the frequency stability of terahertz (THz) quantum-cascade lasers (QCLs) by high-resolution heterodyne spectroscopy. The emission from two pairs of QCLs operating either at 3.4 or at 4.7 THz is mixed in a Schottky diode and the resulting difference frequency in the gigahertz range is measured. The high spectral resolution of less than 1 MHz and a time resolution of 1 ms enable us to investigate feedback-induced frequency instabilities on scales that are relevant for spectroscopy. Frequency changes of up to 70 MHz are observed with an optical feedback of only 3 &x00D7; 10<sup>-5</sup> of the output power of the QCL.
URI: http://localhost/handle/Hannan/151336
volume: 23
issue: 4
More Information: 1,
6
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7880573.pdf883.78 kBAdobe PDF
Title: Heterodyne Spectroscopy of Frequency Instabilities in Terahertz Quantum-Cascade Lasers Induced by Optical Feedback
Authors: Heinz-Wilhelm H&x00FC;bers;Heiko Richter;Ren&x00E9; Eichholz;Martin Wienold;Klaus Biermann;Lutz Schrottke;Holger T. Grahn
Year: 2017
Publisher: IEEE
Abstract: We study the influence of optical feedback on the frequency stability of terahertz (THz) quantum-cascade lasers (QCLs) by high-resolution heterodyne spectroscopy. The emission from two pairs of QCLs operating either at 3.4 or at 4.7 THz is mixed in a Schottky diode and the resulting difference frequency in the gigahertz range is measured. The high spectral resolution of less than 1 MHz and a time resolution of 1 ms enable us to investigate feedback-induced frequency instabilities on scales that are relevant for spectroscopy. Frequency changes of up to 70 MHz are observed with an optical feedback of only 3 &x00D7; 10<sup>-5</sup> of the output power of the QCL.
URI: http://localhost/handle/Hannan/151336
volume: 23
issue: 4
More Information: 1,
6
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7880573.pdf883.78 kBAdobe PDF