Voxtel Raises the Bar Again with the ROX™ Rx Series Lowest Cost, Best Performance Eye-Safe LRF Receivers

May 1, 2015

Delivering cascading improvements in performance and costROX Laser Rangefinder Receiver

Beaverton, Ore., May 1, 2015  Voxtel, Inc. announces enhanced performance and lower price points in its ROX™ Rx series of eye-safe rangefinder receivers (Rx). Compared to the previous generation of industry-leading ROX receivers, the new 100-MHz, 200-µm model (m/n RVC1-NIAC) delivers 50% improvement in sensitivity at half the cost. To enable Voxtel customers to produce ranging systems that are smaller and less expensive than others, Voxtel designed the ROX Rx series of LRF receivers for high sensitivity with low false alarm rates.

“The latest version of our ROX Rx continues to raise the bar enabling our customers to use lower power eye-safe lasers in small, compact systems,” says Voxtel President George Williams, “and when system integrators can incorporate low-power lasers, entire systems shrink in size, weight, power and cost.  Our product improvements enable a new class of rangefinders that are safer to use.”

The ROX Rx series of rangefinder receiver integrates Voxtel’s proprietary high-performance InGaAs avalanche photodiodes (APDs), custom-designed CMOS application-specific integrated circuits (ASICs), and programmable processing circuits to provide flexible system integration, programmable functionality, and reliable performance, all in a small TO-8 package.

Compared to standard photodiode detectors (PIN detectors), Voxtel’s high-gain, low-noise APD provides half the excess noise and superior avalanche gain—up to M = 25—allowing superior range and low false alarm rate. With a 0.5 nW noise equivalent power (NEP), optimal sensitivity is achieved, with linear dynamic range of 25 db, total dynamic range of 70 dB, and 100 mW of overload protection.

Easy to operate and integrate, the ROX Rx technology integrates custom ASICs and programmable features that allow the APD gain to be stabilized over the -40 °C to 80 °C temperature range, and allowing performance to be optimized without the use of thermoelectric cooling. The multiple user-programmable or factory conditions also allow automatic optimization of APD sensitivity over the wide temperature range, or operation in multiple modes for various concepts of operation. The programmable gain and range-variable threshold features allow for the ROX Rx to be quickly configured for new applications and operating conditions. Time-over-threshold features reduce range walk error.

The control capability of the ROX Rx technology includes damage protection of up to 6 MW/cm2 of peak power, and its highly integrated design makes it robust against gun shock and other harsh operating environments.

About Voxtel, Inc.

Founded in 1999, Voxtel, Inc. of Beaverton, Ore., is a leading supplier of 3D imaging systems, eye-safe lasers, and avalanche photodiode (APD) detectors and focal plane arrays (FPAs).

For more information, visit, call 971-223-5646 x119, or email

Voxtel Launches New Class of High-Performance Eye-Safe Micro-Laser Rangefinders

April 20, 2015

Micro-miniature eye-safe laser rangefinder (µLRF) achieves single-shot ranging to 3 km with 100-mm precision

Delivering the highest performance in its class
The ROX uLRF series of micro-laser rangefinders delivers the highest performance in its class.

Beaverton, Ore., April 20, 2015 – Voxtel Inc. is introducing the ROX™ µLRF series of micro-laser rangefinder. Smaller than a keyboard mouse, this new class of high-performance, eye-safe laser rangefinder in an extremely compact, lightweight package is designed for use by high-performance consumer, industrial, and military system integrators.

“We’re delivering safety and unprecedented performance to a host of cost-sensitive applications,” says Voxtel President George Williams.

In applications like hunting and sporting, survey, mapping, altimetry, and UAV-mounted ranging and surveillance, many of today’s products use lasers that—when used at the power levels needed by the application requirements—are not eye-safe, and a tradeoff is made between safety and performance. Lasers operating at eye-safe wavelengths improve the capabilities of all these applications because beam power and quality need not be compromised.

“Voxtel customers want portable, cost-effective, accurate data at long range whether it’s raining or not, and they want to get that data without risk of injury. We’re delivering that capability to the market for the first time,” says Williams.

The ROX  µLRF series of micro-laser rangefinder is the culmination of Voxtel’s efforts developing and refining its ROX technology over the last decade. The ROX µLRF combines low-divergence diffraction-limited eye-safe laser pulses with Voxtel’s state-of-the-art APD receiver to achieve the most sensitive, highest performing rangefinder in its size and weight class. Unlike non-eye-safe solutions, the waterproof ROX series micro-laser rangefinder delivers reliable ranging of targets under direct sunlight, night time and low visibility conditions including fog, rain and snow.

The ROX uLRF integrates a ROX Rx series highly sensitive InGaAs APD receivers; a ROX Tx series small-form-factor eye-safe diode-pumped solid-state lasers; a visible aiming laser; and custom pulse-processing circuits.


About Voxtel, Inc.

Founded in 1999, Voxtel, Inc. of Beaverton, Ore., is a leading supplier of 3D imaging systems, eye-safe lasers, and avalanche photodiode (APD) detectors and focal plane arrays (FPAs).

For more information, visit, call 971-223-5646 x119, or email


Voxtel Introduces the ROX™ Series Eye-Safe Micro-Laser Rangefinder (LRF) Module

May 22, 2014

LRF OEM ModuleMicro-LRF Achieves Single-Shot Ranging to 5 km with 200-mm Precision

Beaverton, Ore., May 22, 2014 – Voxtel, Inc. announces the release of the ROX™ series eye-safe micro-laser rangefinder (LRF) module. Designed for turnkey integration by original equipment manufacturers (OEMs), the new product delivers unprecedented capability in an extremely compact, low-power, low-cost module.

“By custom designing the detector and laser sources, we reduced the ROX LRF module to about the size of a credit card, while achieving the capability to single-pulse range a man-sized target to five kilometers with a precision better than 200 mm,” says Voxtel CEO George Williams, “and an optional capability can extend ranging to 10 kilometers.”

For comparison, today’s eye-safe rangefinders with similar performance are the size of a shoebox, and rangefinders with comparable size only range to about 50 feet.

At a fraction of the cost of other high-performance solutions, the ROX module can be integrated into rifle scopes or cell phone-sized handheld rangefinders, and is poised to reduce significantly the size, weight and cost of handheld and scope-, UAV- and weapon-mounted rangefinders.

The ROX LRF module features a high-gain, low-noise, indium-gallium-arsenide (InGaAs) avalanche photodiode (APD) receiver that allows for low-power laser operations without compromising range or resolution and an ultra-miniature, low-power, 30-kW peak power, 100-µJ pulse energy, diode-pumped solid-state (DPSS), 1535-nm laser.

In addition to reduced size, the low power consumption of 800 mW while ranging leads to extended battery life; the ROX module can acquire range data 189,000 times on a single standard CR123 battery. The turnkey LRF module, provides temperature-compensated performance, and is fully programmable, allowing for easy implementation of user-specific features and operating modes.

Voxtel’s LRF module achieves high sensitivity with better than 0.8 nW noise equivalent power (NEP), dynamic range of 70 db, and excellent damage threshold levels of 6 MW/cm2. Designed for operation in harsh environments, the module is qualified to MIL-STD-833 and MIL-STD-202 and offers a lifetime of 200 million shots.

About Voxtel, Inc.

Founded in 1999, Voxtel, Inc. of Beaverton, Ore., is a leading supplier of 3D imaging systems, eye-safe lasers, and avalanche photodiode (APD) detectors and focal plane arrays (FPAs).

For more information, visit, call 971-223-5646 x119, or email


Voxtel Introduces Lowest Cost 64-channel Time-to-digital Converter

April 25, 2013

High-energy event time-stamp can reduce the cost of military systems


Beaverton, Ore., April 25, 2013Voxtel, Inc. has announced the release of a low-cost event-timing solution for medical imaging, particle and nuclear physics, and LADAR applications requiring picosecond-scale timing on a large number of parallel channels. The 64-channel time-to-digital convertor (TDC) is designed for cost-sensitive, high channel count applications that require accurate conversion of a time interval into a digital output.

“Our engineers designed a high channel count time-to-digital converter, and they achieved picosecond scale timing resolution with the lowest cost-per-channel available on the market today,” says Voxtel founder and CEO George Williams.

TDCs help to determine the time an event occurs by generating the time difference between the leading edge of a common reference signal and the leading edge of an input pulse event. Voxtel’s all-digital TDC YVX-657 time-stamps incoming signal pulses arriving simultaneously on all 64 channels and has on-board capacity to store up to 262,144 time stamps per channel—with a precision of 32 picoseconds.

For input signal tallying, the TDC can also be used as a free-running high-resolution counter, where each individual channel can record and store in local memory the time of arrival of the rising edge of input signals.

See the TDC YVX-657 and learn how Voxtel can reduce your system costs at SPIE Defense, Security and Sensing 2013, booth 2048, April 30 through May 2 in Baltimore, Md., or contact us directly at

About Voxtel, Inc.

Voxtel, Inc., of Beaverton, Ore., is a leading supplier of sophisticated time-of-flight detectors and 3D electro-optical imaging systems for a wide range of government, industrial and scientific markets. Voxtel’s product technologies include highly sensitive APDs, laser radar (LADAR) receivers and active/passive focal plane arrays. For more information, visit Voxtel’s website at



Joseph LaChapelle
Vice President of Business Development
Voxtel, Inc.
15985 NW Schendel Ave., #200
Beaverton, OR 97006
(971) 223-5642

Voxtel Awarded Contract to Develop New Optical Technologies for NASA

April 9, 2013

Light-steering techniques will break the half-millennium standstill in optical lens technology and open a new field of transformational optics.


Beaverton, Ore., April 9, 2013Voxtel, Inc. announces it was awarded a contract to develop novel nanostructured optical technologies for NASA. Working in cooperation with the University of Oregon, under sponsorship of Oregon Nanoscience and Microtechnologies Institute (ONAMI), Voxtel will use 3D inkjet printing techniques to transform the field of optics.

“Optical lens technology is one of the few items we use daily that hasn’t changed significantly in our lifetimes. Lenses are designed using the same principles developed more than 500 years ago, and camera lenses made more than 50 years ago may still outperform those made today,” says George Williams, Voxtel  founder and President.

Voxtel nanotechnology is developed using an additive manufacturing technologies approach. By redesigning from the bottom up, Voxtel will create lenses that “steer” light as it passes through the transparent nanocomposite optical elements. This will allow fabrication of smaller, lightweight lenses, with new capabilities.

In addition to enabling a new technology field of transformational optics, the technology has importance for CMOS-compatible photonics and optical display technologies.

Under the $150,000 first-phase effort, Voxtel’s nanotechnology group, VoxtelNano, will develop high-performance microlens arrays that can be printed directly onto silicon imagers using 3D inkjet printing.  To advance microlens technology rapidly, the initial funding is anticipated to be followed by a second phase $750,000 effort to further develop the technology.

Voxtel also has continuing sponsorship from DARPA and its Manufacturable Gradient Index (M-GRIN) Optics program to apply the 3D inkjet-printed gradient index optics technology to manufacture smaller, lighter weight night vision goggle lenses that will improve the capabilities of warfighters.

About Voxtel, Inc.

Voxtel, Inc., of Beaverton, Ore., is a leading supplier of sophisticated time-of-flight detectors and 3D electro-optical imaging systems for a wide range of government, industrial and scientific markets. Voxtel’s product technologies include highly sensitive APDs, laser radar (LADAR) receivers and active/passive focal plane arrays. For more information, visit Voxtel’s website at


For more information about this topic, or to schedule an interview with VoxtelNano Program Manager Paul Harmon, please call (541) 346-8611or email


Voxtel Introduces New Family of Lowest-cost, Highest-performance, Eye-safe Laser Rangefinder Receivers

April 4, 2013

A highly sensitive avalanche photodiode (APD) receiver with integrated functionality establishes a new price‑performance benchmark for rangefinding applications


Beaverton, Ore., April 4, 2013Voxtel, Inc. announces the release of a new family of lowest-cost laser rangefinder receivers (LRFR) for compact, low-power, weapon-mounted man-portable and unmanned aircraft (UAV) applications. The highly sensitive ROX™ LRFR reduces laser pulse energy requirements by a factor of five or greater, or it can extend the standoff range of existing lasers by two times or more.

“The ROX receiver relaxes demands on lasers and meets critical application performance needs,” says Voxtel President George Williams. “By providing system integrators with a highly sensitive, eye-safe receiver, our ROX receiver minimizes system constraints while reducing overall rangefinder system costs.”

Lasers are the primary cost component of rangefinder systems, requiring the most power and generating the most heat. Because the ROX LRFR lets system integrators use low-power lasers, system costs can be dramatically reduced.

Sensitive throughout the 950-nm to 1550-nm spectrum, including the eye-safe spectral range beyond 1400-nm, ROX LRFRs are designed for industry-leading sensitivity, high dynamic range (70dB) and high damage threshold (5MW/cm²). The reduced part count of the ROX increases both performance and reliability while significantly reducing cost. Wide spectral response allows compatibility with older generations of 1064-nm lasers as well as newer, eye-safe 1550-nm lasers.

Cost-comparable to a PIN-based receiver, the ROX LRFR achieves unprecedented levels of performance by integrating Voxtel’s low noise Deschutes™ indium gallium arsenide (InGaAs) avalanche photodiodes (APDs) with custom detector biasing and signal-conditioning application-specific integrated circuits (ASICS), programmable configuration and control processing circuits, into a hermetic TO-8 package.

The ROX LRFR is the newest of Voxtel’s APD receiver products, which include receivers with bandwidths up to 5 Ghz and InGaAs APDs with gains in excess of 1,000. The ROX receiver is the first of a series of Voxtel planned packaged products that integrate laser rangefinder functionality.

See the ROX LRFR and learn more at SPIE Defense, Security and Sensing 2013, booth 2048, April 30 to May 2 in Baltimore, Md., or contact Voxtel directly at

About Voxtel, Inc.

Voxtel, Inc., of Beaverton, Ore., is a leading supplier of sophisticated time-of-flight detectors and 3D electro-optical imaging systems for a wide range of government, industrial and scientific markets. Voxtel’s product technologies include highly sensitive APDs, laser radar (LADAR) receivers and active/passive focal plane arrays. For more information, visit Voxtel’s website at


For more information about this topic, or to schedule an interview with Voxtel Vice President Joe LaChapelle, please call 971-223-5642 or email

Voxtel Wins DARPA MGRIN-II Award

July 18, 2012

Voxtel has received a 9-month contract sponsored by DARPA under the MGRIN program to develop ink jet printed gradient index optics. The program leverages Voxtel’s leadership position in nanocrystal fabrication, solid state chemistry, and ink jet printed devices.

Voxtel’s Innovation Powers a Next-Generation Solar Cell

July 18, 2012

First-ever practical demonstration of advanced solar collection technique published in Science

Voxtel has demonstrated solar cell devices with the first measured signals from signal amplification due to multiple exciton generation (MEG) in quantum dot structures. This is the first practical verification of the MEG approach for improving the efficiency of solar cells, a ‘third-generation’ solar energy technique. The approach offers the potential for highly efficient, inexpensive photovoltaics that could be printed directly onto surfaces. This groundbreaking finding was published in the prestigious journal Science by a partnership between researchers at Voxtel Inc. and the University of Wyoming. Voxtel is headquartered in Beaverton, Oregon, and Voxtel’s photovoltaic research team is based in Eugene, Oregon.

Voxtel’s approach promises to overcome the Shockley–Queisser limit, the well-known performance ceiling of about 34% efficiency for conventional ‘first-generation’ silicon cells. To overcome this limit, Voxtel developed an approach using quantum dots — semiconductor materials about one-billionth of a meter in diameter. The response of these custom-made materials can be tuned to match the sun’s light — including the infrared portion of the spectrum that silicon cells can not harness.

The engineered use of such quantum dots offers a maximum of about 66% efficiency, but in Voxtel’s MEG approach, the fundamental efficiency limit is raised to approximately 75%. For most photovoltaic technologies, a photon of solar energy can produce only one excited electron in the solar cell, but the MEG design allows multiple excited electrons to be produced and collected when a single photon is absorbed. This effectively multiplies the electrical current that can be produced from the absorption of energy from the sun. Although previous experiments showed that MEG was possible, today’s Science report demonstrated the process in an actual photovoltaic device, using Voxtel’s quantum dots to double the collection of electrons from high-energy photons.

Says George Williams, Voxtel’s president and founder, “Harnessing solar energy using MEG has profound implications for the next generation of solar cells. Today, a typical domestic rooftop installation can power at most a dozen light bulbs, but the potential efficiency of quantum dot solar cells would make solar power a much more practical alternative to fossil fuels.”

The quantum dot approach also has significant benefits in terms of cost. Says Mr. Williams, “Quantum dot solar cells can be fabricated directly from chemicals, and the quantum dot inks can be directly deposited on flexible substrates using roll-to-roll printing techniques, including ink jet printing. This is a major departure from conventional silicon solar cell manufacturing, which relies on costly infrastructure and intensive processing, and also generates a considerable amount of waste.” Both efficiency and cost are crucial in the pursuit of practical photovoltaic systems; for example, a solar cell that is only 15% efficient would have to be supplied at no cost in order to be financially practical when installed.

Regarding the Science report of the first demonstration of MEG in a working device, Mr. Williams says, “in the laboratory, we and others have see evidence of two, three, and more excitons using laboratory equipment, and this data has shown that, in order to extract the extra signal generated in the quantum dots, we needed to extract the carriers from the quantum dot in less than one picosecond — one millionth of one millionth of a second — or else they would recombine with each other. Voxtel used chemical coatings on the quantum dots to induce an electric dipole, which allowed us to capture the amplified signal before the carriers were annihilated.”

This result is a major step in a years-long effort to advance the technology to where it can be manufactured in commercial devices. “This is an extraordinary achievement, but there is also a lot of work remaining to realize the full benefits of quantum dot solar cells. The maximum efficiency of quantum dot cells has been about 7% so far, and despite the potential benefits of MEG, it will be several years before quantum dot solar cells exceed the efficiency of silicon, and several more years more before we realize the cost benefits of printed solar cells.”

Initial press coverage of this development has been brisk:

Upping the Limit on Solar Cell Efficiency — MIT Technology Review
…Two major hurdles remain before the trick can be used to make ultraefficient solar cells. Parkinson used lead-sulfide quantum dots with a crystalline titanium-dioxide electrode. Researchers need to try other combinations of quantum dots and electrode materials to find ones that can convert more photons into multiple electrons. Parkinson says his new methods for making quantum dot solar cells will help them directly test these other combinations. Researchers also need to increase the total amount of light that the quantum dot solar cells can absorb…

Solar cells get two electrons for the price of one, efficiency bonus — Ars Technica
…The technology demonstrated in this paper is particularly interesting for several reasons. First, it is a true “nanomaterial” application where the size of the semiconductor particles enable truly unique properties by confining the excitons to quantum length scales. During my daily abstract scan, it is all too common to find “nano-” papers that simply involve small particles rather than truly novel properties enabled by the scale of the materials.
The work also concentrated on extracting electrons from the nanoparticles rather than just trying to break efficiency records for electron generation…Finally, the experimental setup for this study is largely consistent with dye sensitized solar cells, which are easy to manufacture compared to silicon technologies…

New technology that captures “exciton” particles could replace today’s solar cells —
…This offers a chance for solar cells to trap excitons in a similar way. As long as the cells are coupled with the appropriate electrodes, they too can capture these quasiparticles before they degrade, which means they would save most of the heat and hang onto it as useful energy. It would greatly improve the efficiency of solar cells, all without even having to do anything to the basic photon capture technology.

Work light twice as hard to make cheap solar cells — New Scientist
…Now Bruce Parkinson and Justin Sambur at the University of Wyoming in Laramie, and Thomas Novet of Voxtel in Beaverton, Oregon, have taken the first steps along another route to super-efficient solar cells. Their approach involves harnessing particularly energetic photons – those with more than twice the energy needed to free an electron – and using them to free two electrons rather than one, potentially doubling the current generated…

September 30, 2010, Beaverton, Ore.