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Author  |
Baryshev A. M.; Candotti, M.; Trappe, N. A. | ||||
| Title | Cross-polarization characteristics of GORE-TEX slabs at band 9 frequencies | Type | Miscellaneous | ||
| Year | 2006 | Publication | ALMA Memo | Abbreviated Journal | |
| Volume | Issue | 551 | Pages | ||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ s @ | Serial | 447 | ||
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| 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 | ||
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| 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. | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ atomics90 @ | Serial | 967 | ||
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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 | ||
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| 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. | ||||
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| Notes | Approved | no | |||
| Call Number | RPLAB @ atomics90 @ | Serial | 968 | ||
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| 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 | |
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| 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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| Notes | Approved | no | |||
| Call Number | RPLAB @ atomics90 @ | Serial | 966 | ||
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