Group velocity dispersion in high-performance BH InAs/InP QD and InGaAsP/InP QW two-section passively mode-locked lasers

Ding, Yunyun; Rehbein, W.; Moehrle, Martin G.; Zander, Marlene; Schell, Martin; Kolpatzeck, Kevin; Balzer, Jan C.

doi:10.1364/oe.456823

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…Considering the work of Ding et al. 40 , we find a high-quality pulse compression within our measurement setup. The remaining two measurements are the terahertz photocurrent and the interferometer signal at the BR output.…”

Section: Resultsmentioning

confidence: 94%

Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz

Cherniak,

Kubiczek,

Kolpatzeck

et al. 2023

Sci Rep

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Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include—among others—imaging, material characterization, and layer thickness measurements. While THz-TDS has achieved significant success in research environments, the high cost and bulky nature of most systems have hindered widespread commercialization of this technology. Two primary factors contributing to the size and cost of these systems are the laser and the optical delay unit (ODU). Consequently, our group has focused on developing THz-TDS systems based on compact monolithic mode-locked laser diodes (MLLDs). The ultra-high repetition rate (UHRR) of the MLLD has the added benefit that it allows us to utilize shorter ODUs, thereby reducing the overall cost and size of our systems. However, achieving the necessary precision in the ODU to acquire accurate terahertz time-domain signals remains a crucial aspect. To address this issue, we have developed and enhanced an interferometric extension for UHRR-THz-TDS systems. This extension is inexpensive, compact, and easy to incorporate. In this article, we present the system setup, the extension itself, and the algorithmic procedure for reconstructing the delay axis based on the interferometric reference signal. We evaluate a dataset comprising 10,000 signal traces and report a standard deviation of the measured terahertz phase at 1.6 THz as low as 3 mrad. Additionally, we demonstrate a remaining peak-to-peak jitter of only 20 fs and a record-high peak signal-to-noise ratio of 133 dB at 100 GHz after averaging. The method presented in this paper allows for simplified THz-TDS system builds, reducing bulk and cost. As a result, it further facilitates the transition of terahertz technologies from laboratory to field applications.

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Section: Resultsmentioning

confidence: 94%

Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz

Cherniak,

Kubiczek,

Kolpatzeck

et al. 2023

Sci Rep

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“…Based on this result we fine-tune the dispersion compensation utilizing the POF, achieving an autocorrelation width of 640 fs. Considering the work of Y. Ding et al 39 , we find a high-quality pulse compression within our measurement setup. The remaining two measurements are the terahertz photocurrent and the interferometer signal at the BR output.…”

Section: System Configuration For Interferometric Optical Delay Line ...mentioning

confidence: 83%

Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Cherniak

Kubiczek

Kolpatzeck

et al. 2023

Preprint

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View full text Add to dashboard Cite

Terahertz time-domain spectroscopy (THz-TDS) has emerged as a powerful and versatile tool in various scientific fields. These include – among others – imaging, material characterization, and layer thickness measurements. While THz-TDS has achieved significant success in research environments, the high cost and bulky nature of most systems have hindered widespread commercialization of this technology. Two primary factors contributing to the size and cost of these systems are the laser and the optical delay unit (ODU). Consequently, our group has focused on developing THz-TDS systems based on compact monolithic mode-locked laser diodes (MLLDs). The ultra-high repetition rate (UHRR) of the MLLD has the added benefit that it allows us to utilize shorter ODUs, thereby reducing the overall cost and size of our systems. However, achieving the necessary precision in the ODU to acquire accurate terahertz time-domain signals remains a crucial aspect.To address this issue, we have developed and enhanced an interferometric extension for UHRR-THz-TDS systems. This extension is inexpensive, compact, and easy to incorporate. In this article, we present the system setup, the extension itself, and the algorithmic procedure for reconstructing the delay axis based on the interferometric reference signal. We evaluate a dataset comprising 10,000 signal traces and report a standard deviation of the measured terahertz phase at 1.6 THz as low as 3 mrad. Additionally, we demonstrate a remaining peak-to-peak jitter of only 20 fs and a record-high peak dynamic range of 133 dB after averaging. The method presented in this paper allows for simplified THz-TDS system builds, reducing bulk and cost. As a result, it further facilitates the transition of terahertz technologies from laboratory to field applications.

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“…In PML operation mode, the data shown in Figure 4a was measured at a temperature of 15°C, a gain current of 381 mA and an absorber voltage of -0.2 V. The FWHM of the measured autocorrelation trace is 690 fs with a fiber length of 69 m. This result in PML operational mode confirms measurements that have already been carried out on these lasers. Here, comparable spectra and autocorrelation traces were measured at the same or close operating point, with a fiber length of 71 m. 10,11 In SML operation mode, the following operating point was approached, illustrated in Figure 4b: a temperature of 16°C and a gain curent at 366 mA. A total fiber length of 74 m was implemented into the setup.…”

Section: Qd Lasermentioning

confidence: 99%

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

Kleemann,

Surkamp,

Scherer

et al. 2024

Novel in-Plane Semiconductor Lasers XXIII

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In this study, we conduct a comparative analysis of an InAs/InP quantum dot diode laser and an InGaAsP/InP quantum well laser. Both lasers are monolithic, 840 µm long devices. They have a two-part buried heterostructure with 10%/90% reflection coated facets and emit at 1550 nm (quantum dot laser) respectively 1570 nm (quantum well laser). In passive mode-locking operational mode, the larger section of both devices is continuously pumped with forward current, while the second, smaller section (50 µm) is operated with reverse absorber voltage. In self mode-locking operation both sections of the laser are connected and pumped with forward current. Femtosecond pulses have been detected in both operational modes.

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Group velocity dispersion in high-performance BH InAs/InP QD and InGaAsP/InP QW two-section passively mode-locked lasers

Cited by 8 publications

References 20 publications

Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz

Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz

Laser Diode based THz-TDS System with 133 dB peak Signal-to-Noise Ratio

Investigation of passive mode-locking and self mode-locking in two-section monolithic QW and QD lasers

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