Lag‐Compensated Hyperfine Terahertz Dual‐Comb Interferometer beyond Intrinsic Resolution and Sensitivity

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 12, 2025

Abstract Optical coherence with high precision and sensitivity holds achievements in communication, metrology, sensing. The optical vernier effect generated by the dual‐comb interference highlights technology to heighten accuracy sensitivity, particularly visible infrared bands. However, maturity frequency domain of may overshadow its attributes time domain, which are limited enhancing comprehensive performance. This work provides a lag compensation that enables hyperfine spectrum ultra‐resolution, verified cascading terahertz interferometer. strategy proves 71.4 times improvement resolution beyond intrinsic resolution, reaching Nyquist sampling limit without necessitating unique materials or compromising device geometry. Furthermore, universal Lag‐Interference‐Sensitivity correlation is established guide an ultra‐sensitivity 1.4 × 10 4 GHz·RIU −1 within 0.2–1 THz range, defying two orders magnitude compared existing reports. Finally, application biochemical sensing, 2.63 GHz·mm 2 ·ng 0.59 ng·mm −2 , outperforming current reports stimulating further exploration ultra‐sensitive on‐chip sensors, demonstrated. validation appealing scheme for metrology high‐resolution

Language: Английский

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Dispersion-managed dual-comb laser and measurement of absorption spectroscopy

Optics and Lasers in Engineering, Journal Year: 2025, Volume and Issue: 187, P. 108878 - 108878

Published: Feb. 14, 2025

Language: Английский

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Turnkey generation of MIR soliton and NIR second-harmonic microcombs

Optics Express, Journal Year: 2024, Volume and Issue: 32(22), P. 39860 - 39860

Published: Oct. 10, 2024

Mid-infrared (MIR) microcombs exhibit remarkable advantages for trace molecule detection, facilitating fast and precise spectral analysis. However, due to limitations in tunability size of available MIR pump sources, it is difficult achieve compact mode-locked using traditional methods. Here, we propose the turnkey generation soliton near-infrared second-harmonic a single microresonator. The self-starting method based on self-injection locking eliminates complex tuning process compatible with modular packaged distributed-feedback lasers. By simultaneously leveraging second- third-order nonlinearities, frequency up-conversion can be achieved without relying external nonlinear media, integration f -2 self-referencing. Additionally, direct breathing solitons two-soliton states has been achieved. Meanwhile, new proposed that allows quickly switching between different by simply changing power. We provide operational guidelines explain its operating mechanism. Dynamical analysis shows detuning automatically converges red region corresponding target state. Our work provides full-system miniaturized mode-locking scheme offers potential self-referencing single-resonator.

Language: Английский

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Enhanced spectral resolution in mid-infrared dual-comb spectroscopy via synchronous offset frequency tuning

Optics Express, Journal Year: 2024, Volume and Issue: 33(1), P. 910 - 910

Published: Dec. 19, 2024

Mid-infrared dual-comb spectroscopy offers significant advantages by combining the high sensitivity of mid-infrared with spectral resolution and rapid acquisition method. However, its effective resolution, constrained inherent comb line spacing, hinders ability to resolve narrow absorption features, common in critical applications such as sub-Doppler spectroscopy, low-pressure gas analysis, construction atmospheric profile. To address this challenge, we present a synchronous offset frequency tuning method for system improve far beyond spacing. In our system, source is generated from near-infrared continuous-wave pump laser via difference generation single periodically poled lithium niobate bulk. By adjusting phase-lock one combs, synchronously tune frequencies both combs without changing source. We demonstrated that enabled overlapped lines ethane around 3000 cm-1, achieving uniform sampling interval 10 MHz interleaved spectrum 25-fold enhancement resolution. This approach allows sub-MHz any modifications data offering possibilities high-precision analysis.

Language: Английский

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Over 100-kW peak power picosecond pulse generation at 2924 nm via efficient single-pass optical parametric generation with broadband tunability

Optics Express, Journal Year: 2024, Volume and Issue: 33(2), P. 1969 - 1969

Published: Dec. 26, 2024

We report a high peak power mid-infrared (MIR) source via efficient optical parametric generation (OPG) in piece of 50-mm-long MgO: PPLN crystal pumped by using near-infrared (NIR) narrow-band picosecond laser source. The highest the idler pulse can reach ∼109.86 kW with duration ∼7.3 ps and wavelength ∼2924 nm. Both signal pulses be agilely tunable repetition rate, from 500 kHz to 4 MHz, depending on pump pulses. Through adjusting operation temperature switching applied grating crystal, emission wavelengths broadband-tunable across NIR range 1430-1741nm MIR 2773-4156 nm, respectively. root-mean-square errors delivered average are less than 1% for all operational parameters. Our result provides simplified yet agile solution coherent featuring power, customizable wavelength, exceptional stability, etc.

Language: Английский

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