Continuous-Wave Operation of Terahertz Quantum Cascade Lasers at 3.2 THz

Wang, Tao; Liu, Junqi; Chen, Jianyan; Liu, Yinghui; Liu, Fengqi; Wang, Lijun; Wang, Zhanguo

doi:10.1088/0256-307x/30/6/064201

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…Output peak power up to 213 mW at 10 K with a threshold current density of 257 A/cm 2 was obtained. Compared with our single ridge device [11], the peak power and the threshold current show a characteristic of simple superposition of single ridge lasers. What is more, the array laser operates in the same temperature.…”

Section: Device Characterisationmentioning

confidence: 99%

Monolithically integrated terahertz quantum cascade array laser

et al. 2013

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By integrating triple terahertz quantum cascade lasers (at ∼3.25 THz) monolithically into an array, a peak power of 213 mW is obtained at 10 K with a threshold current density of only 257 A/cm 2. The device shows distinct single-lobe far-field behaviour in the temperature range from 10 to 90 K, with a full-width at half-maximum of 36°. The highest operating temperature of the array laser is identical to that of the single ridge laser, indicating good heat dissipation design in the array. These results are promising for realising high power THz quantum cascade lasers.

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Section: Device Characterisationmentioning

confidence: 99%

Monolithically integrated terahertz quantum cascade array laser

et al. 2013

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“…The development of THz OFCs is, nevertheless, greatly limited by the lack of high-power and compact light sources. In recent years, the continuous maturity of quantum cascade lasers (QCLs) [ 5 , 6 , 7 , 8 ] from the mid-infrared to the THz spectral range has provided an opportunity for advancing the development of OFCs via a joint mechanism of intracavity nonlinear four-wave mixing (FWM) [ 9 ] and injection locking. However, the emergence of more promising THz QCL OFCs is yielding more stable comb operating [ 10 ], a wider current dynamic range and spectral range [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Near-Full Current Dynamic Range THz Quantum Cascade Laser Frequency Comb

Liu

et al. 2023

Micromachines

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The present study proposes a terahertz quantum cascade laser frequency comb (THz QCL FC) with a semi-insulated surface plasma waveguide characterized by a low threshold current density, high power and a wide current dynamic range. The gain dispersion value and the nonlinear susceptibility were optimized based on the combination of a hybrid bound-to-continuum active region with a semi-insulated surface plasmon waveguide. Without any extra dispersion compensator, stable frequency comb operation within a current dynamic range of more than 97% of the total was revealed by the intermode beat note map. Additionally, a total comb spectral emission of about 300 GHz centered around 4.6 THz was achieved for a 3 mm long and 150 µm wide device. At 10 K, a maximum output power of 22 mW was obtained with an ultra-low threshold current density of 64.4 A·cm−2.

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“…The development of THz OFCs is, nevertheless, once greatly limited by the lack of high-power and compact light source. In recent years, the continuous maturity of quantum cascade lasers (QCLs) [5][6][7][8] from mid-infrared to the THz spectral range provides an opportunity for advancing the development of OFCs by a mechanism of intracavity nonlinear four-wave mixing and injection locking [9]. However, emergence of more promising THz QCL OFCs toward yielding more stable comb operating, wider current dynamic range and spectral range [10][11][12], higher output power [13] and narrower beam divergence is still expected for further application.…”

Section: Introductionmentioning

confidence: 99%

THz Quantum Cascade Laser Operating Frequency Comb Over Near-full-current Dynamic Range

Liu

Zhuo

et al. 2021

Preprint

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We report a terahertz quantum cascade laser frequency comb (THz QCL FC) with low threshold current density, high power, and wide current dynamic range. The active region design with the semi-insulated surface plasma waveguide is beneficial to optimize the gain dispersion value and temperature stability. At 10K, the comb with 3-mm-long and 150-µm-wide is capable of emitting 22mW with the threshold current density Jth = 64.4 A·cm−2. The total spectral emission is of about 300 GHz centered around 4.6 THz. Without any extra dispersion compensation measures, the intermode beatnote map reveals stable frequency comb operating within a current dynamic range more than 97% and the narrowest beatnote linewidth is 7.2 kHz. The stable FC operation of a free-running THz QCL makes our device an ideal source for further development of dual-comb spectroscopy.

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Continuous-Wave Operation of Terahertz Quantum Cascade Lasers at 3.2 THz

Cited by 12 publications

References 10 publications

Monolithically integrated terahertz quantum cascade array laser

Monolithically integrated terahertz quantum cascade array laser

Near-Full Current Dynamic Range THz Quantum Cascade Laser Frequency Comb

THz Quantum Cascade Laser Operating Frequency Comb Over Near-full-current Dynamic Range

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