Michael Wojcik - Academia.edu (original) (raw)

Papers by Michael Wojcik

Physical Review Applied, 2018

Extra-laboratory atomic clocks are necessary for a wide array of applications (e.g. satellitebase... more Extra-laboratory atomic clocks are necessary for a wide array of applications (e.g. satellitebased navigation and communication). Building upon existing vapor cell and laser technologies, we describe an optical atomic clock, designed around a simple and manufacturable architecture, that utilizes the 778 nm two-photon transition in rubidium and yields fractional frequency instabilities of 3 × 10 −13 / τ (s) for τ from 1 s to 10000 s. We present a complete stability budget for this system and explore the required conditions under which a fractional frequency instability of 1 × 10 −15 can be maintained on long timescales. We provide precise characterization of the leading sensitivities to external processes including magnetic fields and fluctuations of the vapor cell temperature and 778 nm laser power. The system is constructed primarily from commercially-available components, an attractive feature from the standpoint of commercialization and deployment of optical frequency standards. * A contribution of AFRL, an agency of the US government, and not subject to copyright in the United States.

The Journal of chemical physics, Jan 14, 2017

Vibrationally state selective overtone spectroscopy and dynamics of weakly bound Ne-H2O complexes... more Vibrationally state selective overtone spectroscopy and dynamics of weakly bound Ne-H2O complexes (D0((para)) = 31.67 cm(-1), D0((ortho)) = 34.66 cm(-1)) are reported for the first time, based on near infrared excitation of van der Waals cluster bands correlating with vOH = 2 ← 0 overtone transitions (|02(-)⟩←|00(+)⟩ and |02(+)⟩←|00(+)⟩) out of the ortho (101) and para (000) internal rotor states of the H2O moiety. Quantum theoretical calculations for nuclear motion on a high level ab initio potential energy surface (CCSD(T)/VnZ-f12 (n = 3,4), corrected for basis set superposition error and extrapolated to the complete basis set limit) are employed for assignment of Σ←Σ,Π←Σ, and Σ←Π infrared bands in the overtone spectra, where Σ(K = 0) and Π (K = 1) represent approximate projections (K) of the body angular momentum along the Ne-H2O internuclear axis. End-over-end tumbling of the ortho Ne-H2O cluster is evident via rotational band contours observed, with band origins and rotational ...

Journal of Applied Remote Sensing, 2012

Here, we demonstrate and characterize a high-energy, eye-safe, spectrally narrow, and frequency-a... more Here, we demonstrate and characterize a high-energy, eye-safe, spectrally narrow, and frequency-agile near-IR optical parametric oscillator (OPO). The injection-seeded, noncritical phase-matched (NCPM) potassium titanyle arsenate (KTA) and ring-cavity OPO was pumped in single longitudinal mode (SLM) at 7 ns full width at half maximum FWHM and 30 Hz, neodymium-doped yttrium aluminum garnet (Nd:YAG), generating 243 mJ per pulse OPO signal output with a conversion efficiency of 27%, spectral linewidth of 157 MHz, and approximately M 2 of 29. Also, we demonstrate a nonmechanical method to switch the frequency of the OPO at a rate of 2 Hz from 1535.036 to 1535.195 nm, which represents the on/off resonances of carbon dioxide, respectively. However, the switching rate can be extended into the MHz range and is limited by the electronics driving the diode laser. Given the performance results of our frequency-agile OPO, this transmitter has great potential as a source in DIAL applications.

Infrared Remote Sensing and Instrumentation XVIII, 2010

Laser Technology for Defense and Security V, 2009

Compact quantum cascade laser transmitter. [Proceedings of SPIE 7325, 73250F (2009)]. Norman C. A... more Compact quantum cascade laser transmitter. [Proceedings of SPIE 7325, 73250F (2009)]. Norman C. Anheier, Jr., Brian K. Hatchell, Kevin L. Gervais, Michael D. Wojcik, Kannan Krishnaswami, Bruce E. Bernacki. Abstract. In this ...

Journal of Environmental Quality, 2013

matter; PM 2.5 , particulate matter with an equivalent aerodynamic diameter ≤2.5 mm; PM 10 , part... more matter; PM 2.5 , particulate matter with an equivalent aerodynamic diameter ≤2.5 mm; PM 10 , particulate matter with an equivalent aerodynamic diameter ≤10 mm; TSP, total suspended particulate (particulate matter with an equivalent aerodynamic diameter ≤100 mm).

The Alignment Lasers Task of Pacific Northwest National Laboratory's (PNNL's) Remote Spectroscopy... more The Alignment Lasers Task of Pacific Northwest National Laboratory's (PNNL's) Remote Spectroscopy Project (Project PL211I) is a co-funded project between DOE NA-22 and a Classified Client. This project, which began in the second half of FY03, involved building and delivering a Quantum Cascade (QC) Laser Alignment System to be used for testing the pupil alignment of an infrared sensor by measuring the response from four pairs of diametrically opposed QC lasers. PNNL delivered the system in FY04 and provided technical assistance in FY05 culminating into a successful demonstration of the system. This project evolved from the Laser Development Task of PL211I, which is involved in developing novel laser technology to support development of advanced chemical sensors for detecting the proliferation of nuclear weapons. The laser systems are based on quantum cascade (QC) lasers, a new semiconductor source in the infrared. QC lasers can be tailored to emit light throughout the infrared region (3.5-17 μm) and have high output power and stability. Thus, these lasers provide an infrared source with superb power and spectral stability enabling them to be used for applications such as alignment and calibration in addition to chemical sensing. The QC Laser Alignment System consists of four Alignment Source Assemblies (ASA's) with two QC lasers on each ASA and a computer control system with graphical user interface (GUI) for simple, reliable operation. Each ASA has a temperature sensor and heater for controlling the temperature to enable stable and reproducible output power. In addition, each laser has an on-board photodetector to measure the output power from the rear facet. The computer control system monitors the compliance voltage across the QC laser, the temperature, the current, and the signal from the optical detectors to ensure the system is operating within the specified tolerances. The technical achievements for this project include 1) assembly and construction of the QC Laser Alignment System, 2) far-field characterization of all eight QC lasers, 3) delivery of the QC Laser Alignment System to the Using subcontractor in September 2004, and 4) successful demonstration of the QC Laser Alignment System in March 2005.

Lidar remote sensing is gaining wider acceptance in environmental monitoring community. Therefore... more Lidar remote sensing is gaining wider acceptance in environmental monitoring community. Therefore, eye-safety is an increasingly important requirement for lidar systems. High power laser pulses (> 200 mJ/pulse) are often required to achieve adequate signal-to-noise at meaningful ranges (>15 km) with a single laser shot. Nd:YAG based systems are a convenient and reliable way to achieve high power pulses, but there are substantial challenges to address when using a Nd:YAG to generate eye-safe (1.4-2.1 mum) pulses. Here we demonstrate an optoparametric oscillator (OPO) with >20% conversion efficiency designed to be used as transmitter in a lidar remote sensor. The OPO is a regenerative circulating design using two KTA (Theta=90°, Phi=0°) as the non-linear media. The OPO is pumped by 45 W (1.5 J/pulse, 30 Hz) of 1064 nm light generated by an injection-seeded Nd:YAG laser. Significant performance enhancement was seen when the OPO was externally seeded using an external 1.5344 mu...

Optically Based Biological and Chemical Sensing for Defence, 2004

Quantum cascade laser development efforts for implementation into chemical and remote sensing sys... more Quantum cascade laser development efforts for implementation into chemical and remote sensing systems. [Proceedings of SPIE 5617, 154 (2004)]. Michael D. Wojcik, Tanya L. Myers, Matthew S. Taubman, Bret D. Cannon, Bryan Broocks, Trinesha Mosely. Abstract. ...

Optics and Photonics for Counterterrorism and Crime Fighting VI and Optical Materials in Defence Systems Technology VII, 2010

Demonstration of a high output power 1533nm optical parametric oscillator pumped at 1064nm. [Proc... more Demonstration of a high output power 1533nm optical parametric oscillator pumped at 1064nm. [Proceedings of SPIE 7838, 783815 (2010)]. Robert J. Foltynowicz, Michael D. Wojcik. Abstract. A high output power, eye-safe, LIDAR ...

Renewable Energy and the Environment, 2013

ABSTRACT A mobile DIAL system capable of measuring carbon dioxide (CO2), methane (CH4), and aeros... more ABSTRACT A mobile DIAL system capable of measuring carbon dioxide (CO2), methane (CH4), and aerosols has been developed. A system overview of the DIAL instrument and some representative results will be presented.

Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 2011

Demonstration of a high power 1.5344 μm output Nd:YAG pumped OPO. [Proceedings of SPIE 7917, 7917... more Demonstration of a high power 1.5344 μm output Nd:YAG pumped OPO. [Proceedings of SPIE 7917, 79171Y (2011)]. Michael D. Wojcik, Robert J. Foltynowicz. Abstract. A high output power, eye-safe, lidar transmitter based on ...

Renewable Energy and the Environment, 2011

Continuous improvements of quantum cascade laser (QCL) technology have extended the applications ... more Continuous improvements of quantum cascade laser (QCL) technology have extended the applications in environmental trace gas monitoring, mid-infrared spectroscopy in medicine and life science, law enforcement and homeland security and satellite sensor systems. We ...

Nonlinear Optics, 2011

We have demonstrated a 243mJ, eye-safe, injection seeded, non-critically phase-matched (NCPM), si... more We have demonstrated a 243mJ, eye-safe, injection seeded, non-critically phase-matched (NCPM), singly resonant oscillator (SRO), KTA ring-cavity optical parametric oscillator (OPO). The OPO was pumped with a single mode 7ns FWHM, 30Hz, Q-switched, Nd:YAG at a wavelength of 1064.162nm. The OPO was injection-seeded utilizing a single longitudinal (SLM) distributed feedback (DFB) diode laser. As a result, the KTA OPO generated

Advanced Environmental, Chemical, and Biological Sensing Technologies IX, 2012

ABSTRACT CELiS (Compact Eyesafe Lidar System) is a tactical elastic lidar system commissioned by ... more ABSTRACT CELiS (Compact Eyesafe Lidar System) is a tactical elastic lidar system commissioned by the Strategic Environmental Research and Development Program (SERDP) for the purpose of air quality environmental compliance issues surrounding the offroad use of wheeled and tracked vehicles. A complete CELiS instrument weighs less than 300 lbs., is less than 2 cubic meters in volume and uses 700 W of 120V AC power. CELiS has a working range of better than 2km and a range resolution of 5m.

ph: (865) 576-8401 fax: (865) 576-5728 email: reports@adonis.osti.gov Available to the public fro... more ph: (865) 576-8401 fax: (865) 576-5728 email: reports@adonis.osti.gov Available to the public from the National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Rd., Springfield, VA 22161 ph: (800) 553-6847 fax: (703) 605-6900 email: orders@ntis.fedworld.gov online ordering: http://www.ntis.gov/ordering.htm

Infrared, Mid-IR, and Terahertz Technologies for Health and the Environment II, 2007

Measurement of broad absorption features using a tunable external cavity quantum cascade laser. [... more Measurement of broad absorption features using a tunable external cavity quantum cascade laser. [Proceedings of SPIE 6760, 676003 (2007)]. Mark C. Phillips, Tanya L. Myers, Michael D. Wojcik, Bret D. Cannon, Matthew S. Taubman, David C. Scott. Abstract. ...

Optically Based Biological and Chemical Detection for Defence III, 2006

Gas phase photoacoustic spectroscopy in the long-wave IR using quartz tuning forks and amplitude ... more Gas phase photoacoustic spectroscopy in the long-wave IR using quartz tuning forks and amplitude modulated quantum cascade lasers. [Proceedings of SPIE 6386, 63860S (2006)]. Michael D. Wojcik, Mark C. Phillips, Bret D. Cannon. Abstract. ...

Optics Letters, 2007

We demonstrate mid-infrared spectroscopy of large molecules with broad absorption features using ... more We demonstrate mid-infrared spectroscopy of large molecules with broad absorption features using a tunable external cavity quantum cascade laser. Absorption spectra for two different Freons are measured over the range 1130-1185 cm −1 with 0.2 cm −1 resolution via laser photoacoustic spectroscopy with quartz tuning forks as acoustic transducers. The measured spectra are in excellent agreement with published reference absorption spectra.