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Author
Hovenier J.N.
;
Adam A.J.L.
;
Kašalynas I.
;
Gao J.R.
;
Klaassen T.O.
;
Baryshev A.
;
Williams B.S.
;
Kumar S.
;
Hu Q.
;
Reno J.L.
Title
Phase-locking on the beat signal of a two-mode 2.7 terahertz metal-metal quantum cascade laser
Type
Conference Article
Year
2006
Publication
Proc. Symp. IEEE/LEOS Benelux Chapter
Abbreviated Journal
Volume
Issue
Pages
125-128
Keywords
Abstract
We have studied the linewidth and phase-locking of a 2.7 THz quantum cascade laser by using a superconducting bolometer mixer. The 8 GHz beat signal is compared with a microwave reference with a feedback to the laser bias current. Phase locking has been demonstrated, resulting in an extremely narrow beat linewidth of less than 10 Hz. Under frequency-stabilization conditions we find that the line profile is virtually Lorentzian with a long-term minimum linewidth of the THz modes of about 6.3 kHz. Temperature dependent measurements suggestthat this linewidthdoes not approach the Schawlow-Townes limit.
Address
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Summary Language
Original Title
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Series Title
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Series Issue
Edition
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ISBN
Medium
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Expedition
Conference
Notes
Approved
no
Call Number
RPLAB @ atomics90 @
Serial
968
Permanent link to this record
Author
Baryshev A.
;
Hovenier J.N.
;
Adam A.J.L.
;
Kašalynas I.
;
Gao J.R.
;
Klaassen T.O.
;
Williams B.S.
;
Kumar S.
;
Hu Q.
;
Reno J.L.
Title
Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laser
Type
Journal Article
Year
2006
Publication
Physics Letters
Abbreviated Journal
Volume
89
Issue
Pages
Keywords
Abstract
We have studied the phase locking and spectral linewidth of an ~ 2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave eference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under requency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ~ 6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Notes
Approved
no
Call Number
RPLAB @ atomics90 @
Serial
967
Permanent link to this record
Author
Khosropanah P.
;
Baryshev A.
;
Zhang W.
;
Jellema W.
;
Hovenier J.N.
;
Gao G.R.
;
Klapwijk T.M
;
Paveliev D.G.
;
Williams B.S.
;
Kumar S.
;
Hu Q.
;
Reno J.L.
;
Klein B.
;
Hesler J.L.
Title
Phase-locking of a 2.7-THz quantum cascade laser to a microwave reference
Type
Journal Article
Year
2009
Publication
Optics Letters
Abbreviated Journal
Volume
34
Issue
Pages
2958-2960
Keywords
Abstract
We demonstrate the phase locking of a 2.7 THz metal–metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain (X12) from a
microwave synthesizer at ~ 15 GHz. Both laser and reference radiations are coupled into a bolometer mixer, resulting in a beat signal, which is fed into a phase-lock loop. The spectral analysis of the beat signal con-firms that the QCL is phase locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.
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Approved
no
Call Number
RPLAB @ atomics90 @
Serial
966
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