pulseCheck NX

A new generation in short-pulse measurement tools

pulseCheck NX Autocorrelators Cover the Broadest Range of Wavelengths and Pulse Widths

Optics and Detector Technology for UV to IR (200 nm … > 12 µm)

A wide variety of professional applications can be covered with various detector types and optics sets. Photomultiplier (PMT) detectors are highly sensitive and are ideal for pulse measurements at low pulse energies. Photodiode detectors, on the other hand, are perfect for measuring lasers with high peak power. In combination with highly efficient optics, our detectors pave the way for measurements over an wide wavelength spectrum from 200 nm to 12 μm.

From Ultrashort to Longer Pulses
(5 fs … 500 ps)

Various pulseCheck configurations can be adapted to the individual needs of pulse duration measurement. The measurement of extra long pulse durations up to 500 ps is possible with pulseCheck SM.

NIST Traceable Calibration

An important requirement for quality assurance systems is the traceability of a measuring instrument to international or national standards. For this reason, all APE autocorrelator models are calibrated to a traceable standard according to NIST specifications (NIST = U.S. National Institute of Standards and Technology).

Each pulseCheck comes with a printed and signed calibration certificate. The calibration can of course be renewed at our premises or by a certified partner at any time.

Plug & Play and Easy Integration with Network Interface

The pulseCheck offers easy-to-use plug & play capability via USB. In addition, the pulseCheck can be easily integrated into automated test and measurement environments with an Ethernet connection (SCPI over TCP/IP). And all this is possible without the need for an additional PC. The pulseCheck can also be controlled directly from any location via a network connection.

Maximum Functionality through Modular Design

APE meets the growing need for maximum functionality and flexibility with the modular concept on which the pulseCheck autocorrelator series is based. Thus, Optics sets to upgrade the wavelength range or FROG capability can be added any time.

High Resolution &
Strong Processing Performance

The advanced system-on-chip based architecture enables measure­ments with low latency, a high time resolution down to 50 attoseconds and an intensity dynamic range of 18 bit. This allows full access to even the tiniest autocorrelation features.

Intuitive user interface

The pulseCheck NX software has a user-friendly interface with an intuitive layout. It allows the user to focus on relevant data and gives easy access to built-in data analysis. The high-contrast mode option of the graphical user interface (GUI) enables great visibility when using laser safety glasses.

Integrated, comprehensive data analysis

The NX software comes with comprehensive data analysis tools. Integrated functions such as the tracking of measurement and quality parameters save time. Integrated fitting algorithms make it easier to evaluate the data. Operational settings and previously acquired data can be displayed simultaneously to provide context and reference for current measurements.


At a Glance

* Measured sensitivity including Optics Set, defined as average power times peak power of the incident pulses PAV * Ppeak
Measurable Pulse Width RangeDepending on Base Unit:

< 5 fs ... 15 ps
< 10 fs ... 40 ps
< 20 fs ... 500 ps (SM)
Wavelength Range200 nm - 12 µm, depends on Optics Set
Optics SetsExchangeable
Detector (Optics Sets)PMT, PD, or TPA
Delay ResolutionDepending on Base Unit:

50 attoseconds
200 attoseconds
1 femtoseconds
Delay Linearity< 1 %
SensitivityTypically 1 ... 10-6 W2 depending on Optics Set*
Refresh RateDepending on Base Unit:

10 Hz
7.5 Hz
120 ps/sec (depending on scan range)
Intensity Resolution18 bit
Recommended Repetition RatePD, TPA: 10 Hz and above; PMT: 250 kHz and above
Type of Measurement ModePMT, PD : non-collinear intensity, collinear interferometric;
TPA: hybrid collinear intensity
Mode SwitchingAvailable for PMT, PD
SHG Tuning for Phase MatchingPMT/PD: automatic; TPA: not applicable
Trigger ModeTTL, f < 50 kHz; pulseCheck SM < 10 kHz
Input PolarizationLinear horizontal, vertical available as option
Input Beam CouplingFree-space; Option: fiber coupling FC/PC, FC/APC, SMA
Max Input Power1 W (e.g. oscillator with a rep. rate of approx. 70 MHz) or 10 μJ (e.g. amplified system with rep. rates in the kHz range), whichever results in lower value
Input Aperture6 mm (free-space)
SoftwareIncluded; Real-time display of pulse width and central wavelength, different fitting routines
Fitting RoutineGaussian, Sech2, Lorentz
ConnectivityUSB, Ethernet
Remote ControlPossible via TCP/IP (SCPI command set)
CalibrationNIST traceable calibration certificate included
  • Exchangeable Optics Sets for wavelength coverage from 200 nm to 12 μm
  • Wide range of sensitivity levels covered with PMT, PD, and TPA
  • High temporal resolution with a sampling resolution down to 50 attoseconds
  • Toggle between interferometric and intensity autocorrelation
  • Integrated Controller for data acquisition, data fitting, and fast FPGA data processing
  • Software aided wavelength tuning of crystal (phase matching)
  • Fully compliant with DIN 58175-2:2021-04 (pulse measurement)
  • NX-Software and USB as well as Ethernet connection
  • TCP/IP remote control with standardized command set for easy programming
  • Option: FROG for complete pulse characterization

Datasheets & Brochures

APE FROG Rev. 4.1.1 (pdf / english)

 Step Files (.stp)

APE-pulseCheck-NX-step-files-20210421 (.stp 3D CAD model with overall dimensions)

TCP/IP Sample Code for Remote Control

Contact Us

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Email & Phone Contacts

APE has distributors around the world to give you the best support. Choose a country to find your local sales contact:

APE Angewandte Physik & Elektronik GmbH
Plauener Strasse 163-165 | Haus N
13053 Berlin, Germany

Tel +49 30 986011-30
Fax +49 30 986011333


Coherent Scientific pty. Ltd.
Hilton SA 5033, South Australia

Phone: +61 8 8150 5200

PulsePower Technology Ltd.
Beijing, Haidan District
China 100090

Phone +86 10 62565117

Pinnacle Scientific Cooperation
Hangzhou, Jianggan District
China 310020

Phone +86 571 88225151

199 00 Praha 9, Česko

phone +420 212 247 293

Gammadata Instrument AB
750 02 Uppsala

Tel: +46 18 56 68 35

F 92170 Vanves, France

Tel: +33 1 419 061 80

Laser Sciences Services Pvt. Ltd.

Tel: +91 2778 1673

Photonic Solutions PLC
Edinburgh, UK

Tel: +44 131 664 8122

Ammo Engineering Ltd.
Petach Tikva 49517, Israel

Tel: +972 3 9239 666

Optoprim Srl.

Via Rota, 37
20900 Monza (MB)
Phone: +39 (039) 834977

Via Monte Giberto, 15
00138 Roma
Phone: +39 06 87657838

Phototechnica Corporation
Saitama 336-0017, Japan

Tel: +81 48 871 0067

Seoul 137-862, Korea

Tel: +82 2 3461 1103

Guty Cardenas 147, Guadalupe Inn
Ciudad de Mexico, C.P. 01020, Mexico

Main Contact: Vicente Garcia Gomez
Tel: 52 555 401 8254

Eurotek International
02-668 Warsaw, Poland

Tel: +48 2284 379 40

Innova Scientific S.L.
28290 Las Rozas de Madrid, Espana

Tel: +34 91 7105650

AceXon Technologies Pte. Ltd.
Singapore 658065

Tel: +65 (6565) 7300

Innova Scientific S.L.
28290 Las Rozas de Madrid

Tel: +34 91 7105650

Dyneos AG
CH-8307 Effretikon

Tel: +41 52 355 12 40

SuperbIN Company Ltd.
Taipei 11493
Taiwan, R.O.C.

Tel: +886 2 265 706 78

Photonic Solutions PLC

Tel: +44 131 664 8122

APE Applied Physics & Electronics, Inc.
47635 Lakeview Blvd.
Fremont, CA 94538, USA

Tel: +1(888) 690-3250

Optics Sets

A variety of different and exchangeable optics sets cover a wide wavelength range: from UV at 200 nm to mid IR at 12 μm.



Option FROG measurement for pulseCheck NX

Second Harmonic Generation FROG is the most popular spectrometer-less Frequency Resolved Optical Gating method. The pulseCheck autocorrelators by APE optionally integrate FROG, giving access to complete pulse characterization. This option opens the door to complete spectral and temporal pulse characterization.

A closer look at pulseCheck NX

Further Features

Collinear and Non-Collinear Measurements

Our autocorrelators support fast switching between collinear and non-collinear measurement modes. The collinear mode – often referred to as interferometric or fringe-resolved mode – provides additional qualitative information about the chirp and the central wavelength of the pulse. In contrast, the non-collinear mode – also referred to as intensity autocorrelation – provides background-free, high dynamic range autocorrelation. Although not background-free, switching between these two modes is even realized with the Mini TPA and TPA optics sets for pulseCheck.

Automatic Phase Matching

Autocorrelators take advantage of phase-sensitive and nonlinear processes and require what is called phase matching. APE’s pulseCheck achieves this software aided for each wavelength range, resulting in precise and fast operation without the need for manual adjustment. Measurements are made even easier by using our TPA detectors, which combine detector and nonlinear optics in a single element. Here, phase matching adjustment is no longer necessary at all.

Acquisition Software and TCP/IP Standard Software Interface

All models come with an easy to use data acquisition software, allowing for real-time data display. Furthermore, the TCP/IP-based standard software interface by APE makes it straight forward to set up remote control. This allows you, for example, to design your own automated measurement routines. Simply use our protocol templates for rapid configuration with familiar programming languages, including C++, C#, LabVIEW, Python, Matlab, and Ruby.

Our Autocorrelators at a Glance

A pulseCheck with FROG Option? A Mini? PMT, TPA, or PD Detector? Discover Our Autocorrelator Family.