Sensing platforms based upon photonic integrated circuits have shown considerable promise; however, they require corresponding advancements in optical readout technologies. Here, we present an on-chip spectrometer that leverages thin-film lithium niobate modulator to produce a frequency-agile electro-optic frequency comb for interrogating chip-scale temperature and acceleration sensors. The chirped process allows ultralow radiofrequency drive voltages, which are as much seven orders of...

Traditional electro-optic frequency comb spectrometers rely upon the use of an acousto-optic modulator (AOM) to provide a differential shift between probe and local oscillator (LO) legs interferometer. Here we show that these modulators can be replaced by phase (EOM) which is driven sawtooth waveform induce serrodyne modulation. This approach enables direct spectroscopy performed with single dual-drive Mach–Zehnder (DD-MZM), allowing for lower noise. Further, this method allows simpler...

Direct digital synthesis in concert with an electro-optic phase modulator was employed to generate optical frequency combs tooth spacings as low 100 Hz. These were utilized probe electromagnetically induced transparency (EIT) and hyperfine pumping potassium vapor cells. Long-term coherent averaging demonstrated performance similar that achieved a vastly more expensive arbitrary waveform generator. From the EIT transition we able determine ground state splitting fit uncertainty of 80...

We demonstrate a microfabricated optomechanical accelerometer that is capable of percent-level accuracy without external calibration. To achieve this capability, we use mechanical model the device behavior can be characterized by thermal noise response along with an optical frequency comb readout method enables high sensitivity, bandwidth, dynamic range, and SI-traceable displacement measurements. The resulting intrinsic was evaluated over wide range comparing to primary vibration...

Electro-optic frequency combs were employed to rapidly interrogate an optomechanical sensor, demonstrating spectral resolution substantially exceeding that possible with a mode-locked comb. Frequency generated using integrated-circuit-based direct digital synthesizer and utilized in self-heterodyne configuration. Unlike approaches based upon laser locking, the present approach allows rapid, parallel measurements of full optical cavity modes, large dynamic range sensor displacement,...

Cavity optomechanical sensors can offer exceptional sensitivity; however, interrogating the cavity motion with high accuracy and dynamic range has proven to be challenging. Here, we employ a dual optical frequency comb spectrometer readout microfabricated accelerometer, allowing for rapid simultaneous measurements of cavity’s displacement, finesse, coupling at accelerations up 24 g (236 m/s2). With this approach, have achieved displacement sensitivity 2 fm Hz−1/2, measurement rate 100 kHz,...

We present measurements of the helical mode single photons and do so by sending heralded through a Mach–Zehnder interferometer that prepares light in with topological charge one, interferes it itself fundamental non-helical mode. Masks placed after were used to diagnose amplitude phase light. Auxiliary verified was non-classical state. The results are good agreement theory. experiments demonstrate direct way carry entire spatial helical-mode information.

We present an ultra-low noise, high-voltage driver suited for use with piezoelectric actuators and other low-current applications. The architecture uses a flyback switching regulator to generate up 250V in our current design, output of 1 kV or more possible small modifications. A high slew-rate op-amp suppresses the residual yielding total RMS noise $\approx 100\mu$V (1 Hz--100 kHz). low-voltage ($\pm 10$V), bandwidth signal can be summed unity gain directly onto output, making well-suited...

We present a method for creating quantum degenerate gas of metastable alkaline-earth atoms. This has yet to be achieved due inelastic collisions that limit evaporative cooling in the states. Quantum samples prepared $^{1}S_{0}$ ground state can rapidly transferred either $^{3}P_{2}$ or $^{3}P_{0}$ via coherent 3-photon process. Numerical integration density matrix evolution fine structure bosonic atoms shows transfer efficiencies $\simeq90\%$ with experimentally feasible laser parameters...

We report on a technique to improve the continuous loading of atomic strontium into magnetic trap from Magneto-Optical Trap (MOT). This is achieved by adding depumping laser tuned 3P1 3S1 (688-nm) transition. The increases atom number in and subsequent cooling stages up 65 % for bosonic isotopes 30 fermionic isotope strontium. optimize this strategy with respect 688-nm detuning, intensity, beam size. To understand results, we develop one-dimensional rate equation model system, which good...

An interleaved, chirped electro-optic dual comb system is demonstrated for rapid, high dynamic range measurements of cavity optomechanical sensors. This approach allows the displacements to be interrogated at measurement times as fast 10 µs over ranges far larger than can achieved with alternative methods. While performance this novel, best our knowledge, readout evaluated an accelerometer, method has a wide applications including temperature, pressure, and humidity sensing well acoustics...

We describe a GPU-enabled approach for real-time optical frequency comb spectroscopy in which data is recorded, Fourier transformed, normalized, and fit at rates up to 2.2 GB/s. As an initial demonstration we have applied this rapidly interrogate the motion of optomechanical accelerometer through use electro-optic comb. note that readily amenable both self-heterodyne dual-comb spectrometers molecular as well photonic readout where approach’s agility, speed, simplicity are expected enable...

We report on a new approach to characterize the performance of laser Doppler vibrometer (LDV). The method uses two acousto-optic modulators (AOMs) frequency shift light from an LDV by known quantity create synthetic velocity that is traceable reference. Results are presented for discrete shifts and sinusoidal would be equivalent what observed in ideal accelerometer vibration calibration. also enables user sweep excitation bandwidth together with its associated electronics.

Using new experimental measurements of photoassociation resonances near the $^1\mathrm{S}_0 \rightarrow \phantom{ }^3\mathrm{P}_1$ intercombination transition in $^{84}$Sr and $^{86}$Sr, we present an updated study into mass-scaling behavior bosonic strontium dimers. A previous model [Borkowski et al., Phys. Rev. 90, 032713 (2014)] was able to incorporate a large number for $^{88}$Sr, but at time only handful close dissociation limit were known $^{86}$Sr. In this work, perform more thorough...

We describe an optical sound standard in which the pressure is measured by using a high-finesse cavity to observe induced change refractive index of medium (acousto-optic effect).The substance varies with density, and for compressible it will therefore vary time acoustic field.To accurately measure changes due density variations, we enhance phase shifts cavity.By tracking shift resonance frequency sensitively track thereby cavity.We perform measurement at telecom wavelength (1550 nm),...

We present a frequency agile, integrated electro-optic comb spectrometer based on thin-film lithium niobate which can operate with ultralow radiofrequency voltages. As demonstration we used this platform to simultaneously interrogate two chip-scale photonic sensors.

We present a study of the imaging interference spatial-helical modes single photons. This work includes mathematical treatment that accounts for direction propagation and spatial mode degrees freedom in situation where light travels through an interferometer prepares distinct makes them interfere. results at photon level spatialhelical with topological charge 1 0. The are consistent expectation each carries entire information.

Cavity optomechanical sensors can offer exceptional sensitivity; however, interrogating the cavity motion with high accuracy and dynamic range has proven to be challenging. Here we employ a dual optical frequency comb spectrometer readout microfabricated accelerometer, allowing for rapid simultaneous measurements of cavity's displacement, finesse, coupling at accelerations up 24 g (236 m/s$^2$). With this approach, have achieved displacement sensitivity 3 fm/Hz$^{1/2}$, measurement rate 100...