Measure Pulse Duration.
Optimize Laser Performance.
Pulse duration is a key parameter in the characterization and optimization of ultrafast lasers. It affects peak power and provides important information about the performance of the laser system.
TOPAG offers high-performance autocorrelators for precise pulse duration measurement in research, development, and industrial applications. Depending on the measurement task, single-shot and multi-shot systems are available for different pulse energies, repetition rates, and laser sources.
The systems enable fast, reproducible measurement of ultrashort laser pulses in the femtosecond-to-picosecond range. High measurement stability and ease of use make them a reliable solution for laser characterization, optimization, and quality control.
Key Features of Our Autocorrelators
Reliable determination of pulse duration for ultrashort laser pulses in the femtosecond and picosecond range
Specialized measurement principles for individual pulses or high-repetition-rate lasers with low pulse energy
Models for different wavelength ranges allow use with a wide variety of ultrafast lasers
Simple alignment, intuitive software, and reproducible measurements enable daily use in the research lab
Autocorrelators – Characteristics and Design
For the characterization of ultrashort laser pulses through pulse duration measurement, TOPAG offers specialized autocorrelators manufactured by Femto Easy. Depending on pulse energy, repetition rate, and measurement task, different measurement principles are used: ROC and µROC for single-shot measurements of individual laser pulses, and MS-ROC for highly sensitive multi-shot measurements at very low pulse energies.
All systems enable fast and reproducible determination of pulse duration for ultrashort laser pulses and were developed specifically for use in research laboratories. The autocorrelators can be aligned very quickly, require no calibration, and are supplied with dedicated software (STAR software). This makes them easy to integrate into existing laser setups and quick to bring into operation.
ROC – Single-Shot Autocorrelator for Individual Pulses
The ROC autocorrelator (Row Optical Correlator) enables precise measurement of individual ultrashort pulses independent of repetition rate, from single-shot applications to laser systems in the GHz range.
With its fast alignment, robust design, and calibration-free operation, the ROC is ideally suited to demanding laser systems with varying pulse conditions.
Advantages & Typical Applications
Advantages
- Alignment in seconds
- Suitable for any repetition rate (single-shot to GHz)
- Compact, robust design
- No calibration required
- Fast analysis with the STAR software
Typical Applications
- CPA and amplifier systems
- Low repetition rates
- Pulse-to-pulse analysis
- Post-compressed laser pulses
- Nonlinear experiments
- Spatially resolved pulse duration measurements
µROC – Compact Single-Shot Autocorrelator
The µROC autocorrelator combines the advantages of precise single-shot pulse duration measurement with an exceptionally compact form factor. It was developed specifically for integrated laser systems, OEM applications, and space-constrained laboratory setups.
With fast alignment, robust construction, and no need for calibration, the µROC enables reliable measurement of ultrashort laser pulses while remaining easy to integrate into existing optical systems.
Advantages & Typical Applications
Advantages
- Compact design: only 30 × 40 × 45 mm
- Direct integration into laser systems and machinery
- Fast, simple alignment
- No calibration required
- Suitable for repetition rates from single-shot to 100 MHz
- Fast analysis with the STAR software
Typical Applications
- Compact laser setups and space-constrained experiments
- OEM systems / integrated laser systems
- Mobile measurements and field service
- Ultrafast lasers such as Yb, Ti:Sa, Er, and Tm lasers
- Spatially resolved measurements
MS-ROC – Highly Sensitive Multi-Shot Pulse Duration Measurement
The MS-ROC autocorrelator was developed specifically for precise pulse duration measurement of low-energy ultrashort pulses. Its multi-shot measurement principle improves the signal-to-noise ratio, enabling reliable measurements even at very low pulse energies down to the pJ range. With a large scan range, high resolution, and flexible wavelength options, the MS-ROC offers a versatile solution for modern femtosecond lasers, oscillator systems, and low-pulse-energy applications.
Advantages & Typical Applications
Advantages
- Large scan range and high resolution
- Simple alignment and operation
- Measurement of low pulse energies down to the pJ range
- Flexible wavelength ranges
- Reliable multi-shot pulse duration measurement
- Fast evaluation with the STAR software
Typical Applications
- High-repetition-rate femtosecond lasers
- Oscillator-based laser systems
- Low pulse energies
- Laser development
- Quality control of ultrashort pulses
Flexible Adaptation to Different Laser Sources
Each autocorrelator system is available in a range of models (configurations), each covering different wavelength and pulse duration ranges. This allows precise adaptation to your specific ultrafast laser and measurement task. Drawing on our extensive experience in laser diagnostics and the characterization of ultrashort laser pulses, TOPAG is happy to support you in selecting the right measurement system and in its subsequent integration into your application.
All systems precisely measure pulse duration in the femtosecond and picosecond range and can be aligned quickly. Despite their compact form factor, the autocorrelators deliver stable measurement results and can be operated intuitively via the included STAR software.
Key Specifications of Our Autocorrelators
ROC Series
Single-shot autocorrelator for flexible pulse duration measurement of ultrafast lasers
- Pulse duration measurement: 5 fs to 10 ps
- Wavelength ranges: model-dependent (480–2100 nm)
- Repetition rates: single-shot to GHz
- Alignment: setup in approx. 2 min
- Options: Phase Matching, Trigger, Integrated Attenuation, High Dynamic Range, Enhanced Detection
µROC Series
Compact single-shot autocorrelator for integrated ultrafast lasers
- Pulse duration measurement: 10 fs to 1.5 ps
- Wavelength ranges: model-dependent
- Single-pulse measurement: up to 100 kHz (with Trigger), up to 50 kHz (without Trigger)
- Alignment: setup in approx. 2 min
- Options: Trigger, High Dynamic Range, Enhanced Detection
MS-ROC Series
Multi-shot autocorrelator for sensitive pulse duration measurement of low pulse energies
- Pulse duration measurement: 3 fs to 80 ps
- Wavelength ranges: 480–2150 nm (with four optional crystals)
- Multi-pulse measurement: up to 100 kHz (with Trigger)
- Alignment: setup in approx. 2 min
- Options: Additional crystals, Fiber Input Connector, Low Repetition Rate
One software solution for all series
The measurement and analysis software (STAR software, Software Technology for Acquisition and Retrieval) for our autocorrelators combines fast, clear operation with powerful functions for pulse duration measurement, data analysis, and documentation.
The modern, touchscreen-enabled user interface can be flexibly adapted to the respective measurement task. Data and views can be arranged and displayed individually. This allows the STAR software to support efficient, convenient work in the lab.
Features for Pulse Duration Measurement
- Fast, intuitive data evaluation for efficient laser characterization
- Individually customizable user interface for different measurement tasks
- Touchscreen support and convenient operation via mouse or touchscreen
- Dark mode for comfortable viewing under different lighting conditions
- Flexible display of relevant measurement values for quick assessment of laser performance
- Automatic software updates, with the option of manual updates
- Client-server architecture with REST API for flexible system integration and remote control
- Available for Windows and Linux
With its intuitive operation and flexible system integration, the STAR software supports users in research, development, and everyday work with modern ultrafast lasers.
What Users Say About Our Autocorrelators
Any Open Questions?
We're happy to advise you or arrange a demo measurement
FAQ – Autocorrelators for Ultrafast Lasers
What Is an Autocorrelator?
An autocorrelator is a measurement system for determining the pulse duration of ultrashort laser pulses. It enables the characterization of the temporal properties of femtosecond and picosecond pulses and is an important tool for optimizing modern ultrafast lasers.
The measurement principle is based on splitting the laser beam into two sub-beams. These are overlapped in a nonlinear medium, such as an SHG crystal (second harmonic generation). The resulting signal depends on the temporal overlap of the two pulses. Analyzing this autocorrelation makes it possible to determine the pulse duration.
Why Is Pulse Duration Measurement Important?
Pulse duration affects the peak power of a laser pulse and plays a decisive role in many applications involving ultrafast lasers. Precise pulse duration measurement enables:
- Optimization of compression stages
- Verification of laser performance
- Detection of changes in the optical setup
- Improved stability and reproducibility
- Optimization of laser-based processes
Which Lasers Can Be Measured With an Autocorrelator?
TOPAG autocorrelators are suitable for numerous ultrafast lasers:
- Femtosecond lasers
- Picosecond lasers
- CPA systems
- Oscillator lasers
- Amplifier lasers
- Industrial ultrafast laser systems
Depending on the model, different solutions are available for pulse duration, wavelength range, pulse energy, and repetition rate.
Which Autocorrelator Series Fits My Application?
The choice of the right system depends on the properties of the laser and the measurement task:
- Pulse duration
- Pulse energy
- Repetition rate
- Wavelength range
- Single-shot or multi-shot measurement
- Available installation space
| ROC Series | µROC Series | MS-ROC Series | |
|---|---|---|---|
| Measurement Principle | Single-shot | Single-shot | Multi-shot (Scanning) |
| Pulse Duration | 5 fs to 10 ps | 10 fs to 1.5 ps* | 3 fs to 80 ps* |
| Repetition Rate | Single-shot to GHz | Single-shot to 100 MHz* | 100 Hz to GHz* |
| Wavelength Range | 480–2100 nm* | Model-dependent | 480–2150 nm |
| Optimized For | Individual pulses, variable repetition rates, CPA and amplifier lasers | Compact laser sources, OEM systems, and integrated laser systems | Low pulse energies, oscillator lasers, and high-repetition-rate laser systems |
| Key Advantages | Maximum flexibility, fast alignment, robust design with no moving parts | Ultra-compact design, easy integration, fast alignment | Highest sensitivity, pJ/nJ measurements, only four optional SHG crystals for 480–2150 nm, no detector change required |
| Typical Applications | Research, laser development, CPA systems, amplifier lasers | OEM laser systems, integrated laser sources, compact laboratory setups | Oscillator lasers, nonlinear optics, laser development, characterization of low-energy pulses |
* Model-dependent
TOPAG supports you in selecting the right autocorrelator and advises you on all technical questions relating to the characterization of ultrashort laser pulses. From selecting the right measurement principle to integration into existing laser systems, you receive expert support for research, development, and industrial applications.
What Is the Difference Between Single-Shot and Multi-Shot Autocorrelation?
Single-Shot Autocorrelation
In single-shot measurement, a single laser pulse is analyzed. Advantages:
- Measurement of individual pulses
- Analysis of pulse-to-pulse fluctuations
- Suitable for variable repetition rates
- Ideal for CPA and amplifier systems
Typical systems:
- ROC series
- µROC series
Multi-Shot Autocorrelation
In multi-shot measurement, multiple pulses are used to amplify the signal. Advantages:
- Higher sensitivity
- Measurement of low pulse energies
- Improved signal-to-noise ratio
- Suitable for oscillator lasers
Typical system:
- MS-ROC series
Can Autocorrelators Be Easily Integrated Into Existing Laser Systems?
Yes. TOPAG autocorrelators are designed for easy integration into laboratory, OEM, and industrial laser systems. Advantages:
- Compact form factors
- Fast, simple alignment
- Robust design with no moving parts
- Vibration-insensitive operation
- User-friendly operation
What Features Does the STAR Software Offer?
The STAR software supports fast analysis and documentation of pulse duration measurements.
Features:
- Intuitive operation
- Live display of measurement data
- Automatic pulse duration evaluation
- Analysis and comparison of measurements
- Export and documentation of results