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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Narrow Linewidth Fiber Brillouin Ring Laser for Sensing Applications
摘要： A novel tunable, stable and low-noise Brillouin ring laser layout composed of a doubly-resonant short-cavity Brillouin ring laser (DR-SC) paired with an active wavelength stabilization setup is presented in this work. Measurements of temporal signal stability, relative intensity noise, spectral linewidth and tunability range yielded a marked improvement over the long-cavity version that we have previously reported, making the new layout a promising alternative for applications in fiber sensing and other fields that require highly coherent and stable tunable sources.
关键词： relative intensity noise,fiber sensing,Brillouin ring laser,tunable sources,spectral linewidth
更新于2025-09-23 15:21:01
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Widely tunable ytterbium-doped single-frequency all-fiber laser
摘要： We demonstrate a widely tunable ytterbium-doped single frequency all-fiber laser with a computer-controlled tunable filter and a home-made comb spectrum filter. The comb filter is realized by fusing a single strand of polarization maintaining optical fiber into a double-circulator interferometer. The spectral performance of the comb filter is verified by theoretical and experimental studies. Wavelength-tunable single frequency operation in about 55 nm (1030–1085 nm) range can be achieved through the combined effect of these two filters. The experimental outcomes exhibit that an ultra-narrow linewidth of 435 Hz with high optical signal to noise ratio greater than 50 dB and high stability of operation wavelength and output power (0.016 nm and 0.38 dB, respectively) at room temperature. Our studies provide a new way to obtain the wide-range tunable single frequency fiber laser.
关键词： Wavelength-tunable,Fiber laser,Ultra-narrow linewidth,Single frequency,Comb spectrum filter
更新于2025-09-23 15:21:01
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Dynamics and spectral characteristics of quantum dot semiconductor lasers under optical injection locking
摘要： The operation of an injection-locked quantum dot laser including the output characteristics, modulation response, and linewidth enhancement factor (LEF) has been investigated in detail considering the effect of homogeneous and inhomogeneous broadenings. Results demonstrate that a single-mode operation is guaranteed for a broad range of homogeneous broadening values (operation temperatures). Injection power-dependant reduction in the threshold current and a large increase in the slope efficiency and the output power have been achieved. Also, a near-zero and uniform LEF is obtained for the whole lasing spectra where drastic reduction from ~60 to 0.76 is observed for non-injected modes. The device exhibits a reduced settling time and modified modulation response especially a reduced frequency overshoot and enhanced 3dB modulation bandwidth. Obtained characteristics provide a design degree of freedom for spectral shaping and single/multi-mode operation which are favorable features for optical signal processing applications.
关键词： Optical injection locking,linewidth enhancement factor,modulation response
更新于2025-09-23 15:19:57
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Performance improvement of optical negative feedback laser by reducing feedback loop length
摘要： The Optical path length of an input/output optical waveguide in a Si ring ?lter is reduced to shorten the feedback loop length of an optical negative feedback laser. Thanks to the increase in phase margin in the optical negative feedback system, the spectral linewidth of a single-mode semiconductor laser can be reduced to 99.8 kHz.
关键词： Si ?lter,semiconductor laser,spectral linewidth,integration,negative feedback
更新于2025-09-23 15:19:57
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Transportable 1555-nm Ultra-Stable Laser with Sub-0.185-Hz Linewidth
摘要： We present two cavity-stabilized lasers at 1555 nm, which are built to be the frequency source for a transportable photonic microwave generation system. The frequency instability reaches the thermal noise limit (7 × 10?16) of the 10-cm ultra-low expansion glass cavity at 1–10 s averaging time and the beat signal of the two lasers reveals a remarkable linewidth of 185 mHz.
关键词： cavity-stabilized,linewidth,frequency instability,1555-nm ultra-stable laser
更新于2025-09-23 15:19:57
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Red, Green, and Blue Microcavity Quantum Dot Light-Emitting Devices with Narrow Line Widths
摘要： Colloidal quantum dots (QDs) are tiny particles produced chemically from semiconductor materials with sizes below 100 nm. Because of the quantum size effect, QDs have very unique luminescent properties. Based on these light emitters, quantum dot light-emitting diodes (QLEDs) exhibit outstanding electroluminescence (EL) performances and they are promising for application in displays, light sources and quantum-optoelectronic technologies. One of the greatest challenges in QLEDs is their low light outcoupling efficiency due to their planar structure, which limits the external quantum ef?ciency (EQE) of QLEDs for commercial applications. Here, we report the development of a set of red, green, and blue QLEDs with high EQE by incorporating microcavity structure in the devices. These microcavity devices exhibit modified EL spectra with full width at half maximum of 12-14 nm. Red, green, and blue microcavity QLEDs show maximum current efficiency and maximum EQE of 96.5 cd·A-1 and 33.1%, 102 cd·A-1 and 24.7%, and 2.91 cd·A-1 and 11.2%, respectively. We anticipate that a suitable design of a microcavity combining superior QDs will lead to excellent EL performance of QLEDs for displays, ideal QLED-based single-photon sources for quantum information technology, and electrically pumped QD lasers.
关键词： EQE,narrow linewidth,QLED,quantum dot,microcavity,electroluminescence
更新于2025-09-23 15:19:57
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Spectral linewidth reduction of quantum cascade lasers by strong optical feedback
摘要： In this work, we propose to employ strong optical feedback to narrow the spectral linewidth of quantum cascade lasers without using any phase control. Rate equation analysis demonstrates that optical feedback beyond a certain level always reduces the laser linewidth for any feedback phase. It is also found that the linewidth becomes less sensitive to the feedback phase for higher feedback strength. Simulations show that optical feedback with a feedback ratio of ?10 dB can suppress the laser linewidth by about two orders of magnitude. This is in contrast to near-infrared laser diodes, which can be easily destabilized by strong feedback.
关键词： quantum cascade lasers,spectral linewidth reduction,optical feedback
更新于2025-09-23 15:19:57
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Diamond Brillouin laser in the visible
摘要： Brillouin lasers providing extremely narrow-linewidth are emerging as a powerful tool for microwave photonics, coherent communications, quantum processors, and spectroscopy. So far, laser performance and applications have been investigated for a handful of select materials and using guided-wave structures such as micro-resonators, optical fibers, and chip-based waveguides. Here, we report a Brillouin laser based on free-space laser action in an extreme optical material. Continuous-wave lasing 167 GHz from a 532 nm pump is demonstrated in diamond using a doubly resonant ring cavity, generating a pump-limited output power of 11 W. The Brillouin gain coefficient is measured to be 79 cm GW?1 with a linewidth of 12 MHz. These properties, along with an exceptionally high Brillouin frequency and wide transmission range, make diamond Brillouin lasers a promising high-power source of narrow-linewidth output and mm-wave beat notes.
关键词： narrow-linewidth,quantum processors,microwave photonics,diamond,Brillouin lasers,spectroscopy,coherent communications
更新于2025-09-19 17:13:59
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[IEEE 2019 Joint Conference of the IEEE International Frequency Control Symposium anEuropean Frequency and Time Forum (EFTF/IFC) - Orlando, FL, USA (2019.4.14-2019.4.18)] 2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC) - Ultrastable Laser System Using Room-Temperature Optical Cavity with 4.8??10 <sup>a??17</sup> Thermal Noise Limit
摘要： A new clock laser system using an optical cavity with 4.8×10-17 thermal noise limit has been developed for rapid evaluation of ytterbium lattice clocks. This was realized by using a 30-cm-long ULE cavity, fused-silica mirror substrates, and crystalline mirror coatings. The frequency stability of the beating signal between the new clock laser and the old clock laser was limited by the latter. The linewidth and the frequency stability of the new clock laser will be measured by comparing the frequency between two similar systems.
关键词： linewidth,ytterbium,optical lattice clock,frequency stability,optical cavity,clock laser,crystalline coating
更新于2025-09-19 17:13:59
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Temperature dependent linewidth rebroadening in quantum dot semiconductor lasers
摘要： We experimentally and analytically investigate the influence of temperature on the linewidth of an InP quantum dot (QD) laser. The full width half maximum (FWHM) of the peak in the optical spectrum strongly depends on the pump current and rebroadens at high injection levels. We show that with increasing temperature these effects are amplified. Applying a QD laser model including the excited (ES) and ground state (GS) with detailed balance scattering rates, we are capable of reproducing the experimentally observed data qualitatively and thus show that a relatively simple QD-laser model is capable of capturing this complex behavior. Additionally, we include a temperature dependent energy band gap reduction needed to fit the data and show that this effect enhances the rebroadening effect for higher temperatures.
关键词： Solid State Physics,Linewidth,Quantum Dot Lasers
更新于2025-09-19 17:13:59