Transformation of the multimode terahertz quantum cascade laser beam into a Gaussian, using a hollow dielectric waveguide

Danylov, Andriy A.; Waldman, J.; Goyette, Thomas M.; Gatesman, Andrew J.; Giles, Robert H.; Linden, Kurt J.; Neal, William R.; Nixon, William E.; Wanke, Michael Clement; Reno, John L.

doi:10.1364/ao.46.005051

Cited by 35 publications

(20 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, hollow dielectric [10] and metallic [11][12][13][14] waveguides (wgs) have proven to be a very efficient way of guiding THz light with extremely low attenuations and low dispersion. Furthermore, the possibility of employing flexible waveguides [15], offers new possibilities for their implementation into many applications, such as in imaging and spectrosopy.…”

Section: Introductionmentioning

confidence: 99%

Hollow metallic waveguides integrated with terahertz quantum cascade lasers

Degl’Innocenti¹,

Shah²,

Jessop³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

Abstract:We present the realization of a compact, monolithically integrated arrangement of terahertz quantum cascade lasers with hollow metallic cylindrical waveguides. By directly mounting a copper pipe to the end facet of a double metal waveguide, it was possible to significantly improve the far field emission from such a sub-wavelength plasmonic mode, while preserving the characteristic performance of the laser. Careful alignment of the quantum cascade laser and the hollow waveguide is required in order to prevent the excitation of higher order/mixed modes as predicted with a high degree of accuracy by a theoretical model. Finally, this approach proved to be a superior method of beam shaping when compared to other in situ arrangements, such as a silicon hyper-hemispherical lens glued to the facet, which are presented. Ritchie, "Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide," J. Appl. Phys. 110(6), 063112 (2011). 16. S. Barbieri, J Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, "2.9 THz quantum cascade lasers operating up to 70 K in continuous wave," Appl.

show abstract

Section: Introductionmentioning

confidence: 99%

Hollow metallic waveguides integrated with terahertz quantum cascade lasers

Degl’Innocenti¹,

Shah²,

Jessop³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

show abstract

“…The method of TQCL mounting is described in detail in Ref. [21]. Pulses of 1 ms duration with a repetition rate of 37 Hz were used to drive the TQCL in a pulsed regime.…”

Section: Thz Qcl Characterizationmentioning

confidence: 99%

“…Neither temperature nor current stabilization of the TQCL was used in these experiments. A hollow dielectric Pyrex tube of 30 mm length and 1.5 mm inner diameter (ID) was used to significantly improve the laser radiation transverse mode content to a near-Gaussian beam profile [21]. The TQCL radiation was collimated with an off-axis parabolic (OAP) mirror (focal length (FL) of 59.7 mm) and then focused with a second OAP (FL of 38.1 mm) onto the antenna of a whisker-contacted, corner-reflector-mounted Schottky barrier diode (SD) type 1T17, made by University of Virginia.…”

Section: Sideband Generationmentioning

confidence: 99%

Terahertz sideband-tuned quantum cascade laser radiation

Danylov¹,

Waldman²,

Goyette³

et al. 2008

Opt. Express

Self Cite

View full text Add to dashboard Cite

Abstract:A compact, tunable, narrowband terahertz source was demonstrated by mixing a single longitudinal mode 2.408 THz, free running quantum cascade laser with a 2-20 GHz microwave sweeper in a conventional corner-cube-mounted Schottky diode. The sideband spectra were characterized with a Fourier transform spectrometer, and the radiation was tuned through several D 2 O rotational transitions to estimate the longer term (t ≥ several sec) bandwidth of the source. A spectral resolution of 2 MHz in CW regime was observed. Wanke, and J. L. Reno, "Transformation of the multimode terahertz quantum cascade laser beam into a Gaussian, using a hollow dielectric waveguide," Appl. Opt. 46, 5051-5055 (2007). ©2008 Optical Society of America

show abstract

“…For instance, the original Gaussian exponential functions found applications from heat diffusion [10][11][12][13][14] to random phenomena [4,[15][16][17][18][19][20][21][22]. Gaussians are also ubiquitous in quantum mechanics, where they are intimately related to the harmonic oscillator [23][24][25][26][27] and to the coherent [28][29][30][31][32][33][34] and squeezed state formalism [35][36][37][38]. In Quantum Optics, they are used to study the light intensity distribution coming out of the beam of a laser [39][40][41][42][43][44][45][46][47][48][49] and Gaussian beams are fundamental for testing and comparing wave optical models and systems [50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%