Coherent soft x-ray (SXR) sources enable fundamental studies in the important water window spectral region. Until now, such have been limited to repetition rates of 1 kHz or less, which restricts count and signal-to-noise ratio for a variety experiments. SXR generation at high rate has remained challenging because missing high-power infrared laser drive high-harmonic (HHG) process. Here we present an optical parametric chirped pulse amplifier (OPCPA) centered wavelength 2.2 µm generating...

Single-cavity dual-comb lasers are a new class of ultrafast that have wide possible application space including pump–probe sampling, optical ranging, and gas absorption spectroscopy. However, to date, laser cavity multiplexing has usually come with trade-off in performance or relative timing noise suppression. We present method for single support pair noise-correlated modes. These modes share all intracavity components take near-common path, but do not overlap on any active elements....

We present a new type of dual optical frequency comb source capable scaling applications to high measurement speeds while combining average power, ultra-low noise operation, and compact setup. Our approach is based on diode-pumped solid-state laser cavity which includes an intracavity biprism operated at Brewster angle generate two spatially-separated modes with highly correlated properties. The 15-cm-long uses Yb:CALGO crystal semiconductor saturable absorber mirror as end more than 3 W...

Hyperspectral LiDAR (HSL) enables the simultaneous acquisition of surface geometry and spectral signatures remote natural targets, making it valuable for various applications such as material probing, automated point cloud segmentation, vegetation health monitoring. We present a first proof-of-concept study broadband dual-comb HSL system based on 1 GHz supercontinuum (SC). The SC spans from 820 to 1300 nm, generated via coherent broadening free-running single-cavity oscillator at 1053 nm in...

Dual optical frequency combs are an appealing solution to many measurement techniques due their high spectral and temporal resolution, scanning speed, lack of moving parts. However, industrial field-deployable applications such systems limited a high-cost factor intricacy in the experimental setups, which typically require pair locked femtosecond lasers. Here, we demonstrate single oscillator produces two mode-locked output beams with stable repetition rate difference. We achieve this via...

Long-distance ranging is a crucial tool for both industrial and scientific applications. Laser-based distance metrology offers unprecedented precision making it the ideal approach many deployments. In particular, dual-comb favorable due to its inherently high sampling rate. To make high-performance long-range LiDAR more accessible by reducing cost complexity, here we demonstrate fiber-based frontend combined with free-running diode-pumped solid-state laser that allows sub-µm measurement...

We demonstrate a free-running single-cavity dual-comb optical parametric oscillator (OPO) pumped by solid-state laser. The OPO ring cavity contains single periodically-poled MgO-doped LiNbO3 (PPLN) crystal. Each idler beam has more than 245-mW average power at 3550 nm and 3579 center wavelengths (bandwidth 130 nm). signal beams are simultaneously outcoupled with 220 mW per 1499 1496 wavelength. nominal repetition rate is 80 MHz, while the difference tunable set to 34 Hz. To evaluate...

Pulse trains emitted from dual-comb systems are designed to have low relative timing jitter, making them useful for many optical measurement techniques such as ranging and spectroscopy. However, the characterization of low-jitter is challenging because it requires with high sensitivity. Motivated by this challenge, we developed a technique based on an heterodyne detection approach measuring jitter two pulse trains. The method suitable essentially any repetition rate difference. Furthermore,...

We present a high-power mid-infrared (mid-IR) optical parametric chirped-pulse amplifier (OPCPA) generating 14.4 fs pulses centered at 2.5 µm with an average power of 12.6 W and repetition rate 100 kHz. The short are obtained without nonlinear pulse compression. This is in contrast to most few-cycle systems operating the mid-IR. In our case, ultrashort duration enabled by careful design gain profile each amplification stage as well precise control signal dispersion throughout system. A...

We investigate terahertz time-domain spectroscopy using a low-noise dual-frequency-comb laser based on single spatially multiplexed cavity. The cavity includes reflective biprism, which enables generation of pair modelocked output pulse trains with slightly different repetition rates and highly correlated noise characteristics. These two are used to generate the THz waves detect them by equivalent time sampling. is Yb:CALGO, operates at nominal rate 1.18 GHz, produces 110 mW per comb 77 fs...

Dual-comb spectroscopy (DCS) enables high-resolution measurements at high speeds without the trade-off between resolution and update rate inherent to mechanical delay scanning. However, complexity limited sensitivity remain significant challenges for DCS systems. We address these via a wavelength-tunable dual-comb optical parametric oscillator (OPO) combined with an up-conversion detection method. The OPO is tunable from 1300-1670 nm (signal) 2700-5000 (idler). Spatial multiplexing in both...

Ultrafast pump-probe measurements are used to characterize various samples, such as biological cells, bulk, and thin-film structures. However, typical implementations of the apparatus either slow or complex costly hindering wide deployment. Here we combine a single-cavity dual-comb laser with simple experimental setup obtain ultra-high sensitivity, fast acquisition, high timing precision over long optical delay scan ranges 12.5 ns that would correspond mechanical about 3.75 m. We employ...

Dual-comb ranging has emerged as an effective technology for long-distance metrology, providing absolute distance measurements with high speed, precision, and accuracy. Here, we demonstrate a dual-comb method that utilizes free-space transceiver unit, enabling dead-zone-free simultaneous interchanged comb roles to allow measurements, even when the target is moving. It includes graphics processing unit (GPU)-accelerated algorithm real-time signal free-running single-cavity solid-state laser...

Single-cavity dual-combs comprise a rapidly emerging technology platform suitable for wide range of applications like optical ranging, equivalent time sampling, and spectroscopy. However, it remains challenging task to develop dual-comb system that exhibits low relative frequency fluctuations allow comb line resolved measurements, while simultaneously offering high average power short pulse durations. Here we combine passively cooled compact solid-state oscillator with pair core-pumped...

Abstract Semiconductor saturable absorber mirrors (SESAMs) have enabled a wide variety of modelocked laser systems, which makes measuring their nonlinear properties an important step in design. Here, we demonstrate complete characterization SESAMs using equivalent time sampling apparatus. The light source is free-running dual-comb laser, produces pair sub-150-fs outputs at 1051 nm from single cavity. average pulse repetition rate 80.1 MHz, and the full window scanned 240 Hz....

In measuring cerebral blood flow (CBF) noninvasively using optical techniques, diffusing-wave spectroscopy is often combined with near-infrared to obtain a reliable index. Measuring the index at determined depth remains ultimate goal. this study, we present simple approach dual-comb lasers where simultaneously measure absorption coefficient (μ

We compare the generation of high-order harmonics in water window (283-543 eV) with 0.8-µm and 2.2-µm few-cycle lasers at a pulse repetition rate 100 kHz. Using conventional phase matching driver what we attribute to nonadiabatic self-phase-matching driver, photons up 0.6 keV (2 nm) are generated both cases. Special attention is paid understanding mechanism laser amplifier system. use same beamline pump for drivers, which allows direct flux comparison two driving wavelengths. For photon...

In optical parametric amplification (OPA) of broadband pulses, a non-collinear angle between the interacting waves is typically introduced in order to achieve phase-matching. Consequently, bandwidth and beam geometry are closely linked. This coupling restricts geometrical layout an OPA system. Here, we demonstrate quasi-phase-matching (QPM) for which transverse component QPM grating impose additional momentum on generated wave. shift detunes wavelength where signal idler group-velocity...

We experimentally demonstrate a novel use of spatial light modulator (SLM) for shaping ultrashort pulses in time-gated amplification systems.We show that spectral aberrations because the device's pixelated nature can be avoided by introducing group delay offset to pulse via SLM, followed amplification.Because phase wrapping, large yields nearly-periodic grating-like function (or grating).We that, this regime, grating periocidity defines spectrum applied pulse, while grating's amplitude...

We present a scheme for correcting the spectral fluctuations of high-harmonic radiation. show that extreme-ultraviolet (XUV) power density can be predicted solely by monitoring generating laser pulses; this method is in contrast with traditional balanced detection used optical spectroscopy, where replica signal monitored. Such possibility emerges from detailed investigation generation (HHG) noise. find wide parameter range HHG process, XUV are dominated blueshift, which correlated to...

Free-running single-cavity dual-comb lasers offer cost-effective, high-performance solutions to LiDAR. Precision requires ultra-low timing jitter whereas high sampling-speeds require ⪆1-GHz oscillators which often exhibit increased jitter. We address this challenge by exploring Yb:CaF2-based solid-state optimized for high-frequency noise. Such already demonstrated noise but scaling 1 GHz repetition rates faced challenges because of low gain crystal nonlinearities and Q-switching-induced...

Amplifier-based pump-probe systems, while versatile, often suffer from complexity and low measurement speeds, especially when probing samples require excitation fluences. To address these limitations, we introduce a system that leverages 60-MHz single-cavity dual-comb oscillator an ultra-low noise supercontinuum. The setup can operate in equivalent time sampling or programmable optical delay generation modes. We employ this to study the wavelength-dependent excited-state dynamics of...