Autocorrelator for Ultrafast Laser Measurement

  • Update:Mar 07, 2018
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Our current product-line includes a single shot autocorrelator, capable of measuring few cycle pulses with interferometric resolution, and an innovative SHG single shot FROG. Both are suitable for several wavelength ranges (from UV to mid-IR) and seve

Product Introduction

Ultrafast instrumentation (No Alignment!)

We offer products specialized in ultrafast metrology with strong expertise in the production and characterization of high energy ultrashort pulses. We provide robust and reliable measurement devices for ultrafast lasers, already used in some state of the art laboratories.

Our current product-line includes a single shot autocorrelator, capable of measuring few cycle pulses with interferometric resolution, and an innovative SHG single shot FROG. Both are suitable for several wavelength ranges (from UV to mid-IR) and several pulse durations, down to 5 fs. We also develop a innovative compact spectrometer and beam profilers.

Beside their intrinsic technical performances, our products are very easy to use, compact, portable and versatile, which make them the ideal tools for customer services. The products are associated with a high quality user-friendly software which contributes to make them easy and pleasant to use. We also make vacuum compatible measurement devices and custom products upon request and we provide our expertise on ultrafast metrology.

Very easy to use

Our 2 major products can be installed in only 2 minutes with no necessary calibration. It comes in an ultra compact (50x50x150mm) package for the long pulse model and a 50x50x250mm package for the fs one.

No internal freespace alignment

Designed specifically to be ultra easy to use and to align onto the laser beam. They cannot be misaligned, there is no need for calibration or tweaking and even after transport! Save hours on freespace alignment and spend more time on your experiments!

High level of accuracy

Our autocorrelator provides single shot measurements up to 200 kHz and down to 5 femtosecond pulses while our achromatic and non-dispersive single shot FROG can go down under 5 femtosecond pulses.

Intuitive, powerful companion software

The companion Femto Easy software can run either on Linux or Windows. It is heavily optimized and specifically designed from the ground up to provide accurate control and readings of the Femto Easy products.

STFE-ROC Series Ultra Compact Autocorrelator (Alignment-free)

ROC stands for Row Optical Correlator. The ROC autocorrelators are ultra compact and robust single shot autocorrelators. As the name implies, they are designed specifically to be ultra easy to use and to align onto the laser beam. They cannot be misaligned, there is no need for calibration or tweaking and they are easily transportable. And yes, they are rock-solid!

Besides those advantages, the ROCs autocorrelators provide excellent technical performances and highly accurate measurements.

The ROCs autocorrelators are available for several wavelength and several pulse duration.

Features:

        

Software interface:

The software has been designed to be user friendly and intuitive. This is a modern software compatible with touchscreen that can run either under Linux or Windows. It allows distant control of the devices via PC, tablet or smartphone. We can also provide custom software developments upon request.

Measurement of few cycle pulses:

This is an autocorrelation measurement sample of ultrashort pulse that has been performed in Politecnico di Milano with our short pulse model autocorrelator ROC FC-700.

On the top, the raw image of the spatially resolved autocorrelation trace.

At the bottom, the analysed autocorrelation trace integrated over the spatial coordinate. The experimental data (in red) are fitted by a Gaussian function (in blue). The full width at half maximum of the autocorrelation trace is 8.3 fs. The corresponding Gaussian pulse duration is 5.9 fs.

Measurement of low energy pulses:

This measurement has been performed on a femtosecond Ti:Sapph oscillator at LCAR with a ROC FC-400 autocorrelator.

The average power used for the measurement was with only 20 mW at 62 MHz repetition rate. It means that in this conditions 0.3 nJ per pulse was enough to get a clean measurement. At the buttom, the raw image of the spatially resolved autocorrelation trace.

On the top, the analysed autocorrelation trace integrated over the spatial coordinate. The experimental data (in blue) are fitted by a Gaussian function (in red). The full width at half maximum of the autocorrelation trace is 30.4 fs for a Gaussian pulse duration of 21.5 fs.

Specifications:

Models STFE-ROC-FC600 STFE-ROC-FC400 STFE-ROC-FS600 STFE-ROC-FS400 STFE-ROC-PS600 STFE-ROC-PS400
Pulse duration [fs] 5 - 150 5 - 150 20 - 500 20 - 500 50-10,000¹ 50-5,000¹
Wavelength range [nm] 600-2100² 450-2100³ 600-2100² 450-2100³ 600-2100² 450-2100³
Input pulse repetition rate From Hz to GHz⁴
Input pulse energy [nJ]⁵ Single shot :>1000 1 MHz :>10 1 GHz :> 0.05 (with low energy option)
Input polarization Linear vertical or horizontal
Detection CMOS 12 bit – 3Mpx – 72dB
PC interface USB 3 or GigE
Beam height [mm] 30 – no limit
Dimensions [mm] 55x56x265 55x56x265 55x56x265 55x56x265 55x56x195 55x56x95

1. Four pulse duration ranges available:

2. Four wavelength options for ROC 600:

3. Six wavelength options for ROC 400:

4. Over 80 kHz, the measurements are average over several shots. The number of shot shots depends on the laser rep rate (ex: 4 shots for 200 kHz). Devices with higher shot to shot measurement capacity can be made upon request.

5. The minimum average input power is 10 mW at 1 MHz. The maximum average input power is 2.5 W, it means that in most of the cases the beam can be injected directly into the ROC.

STFE-FROG Series FROG Autocorrelator with Real Time Phase Retreival

FROG stands for Frequency Resolved Optical Gating. The Fast Frog product line provides reliable and compact single shot FROGs, based on second harmonic generation. Key design features, such as the wavefront pision technique and the mini imaging spectrometer, make the Fast Frog very easy to use and provide a high level of accuracy. Six models are available to cover a broad spectral range and a broad pulse duration range from sub-5 fs to 10 ps. Two designs are available : one for long pulses mainly relying on transmission optics, and one for ultrashort pulses which is completely achromatic. We also propose a wavelength tunable Fast FROG that combines a very broad spectral range with a high spectral resolution.

Features:

 

Software interface:

Furthermore it is very user friendly, the Fast FROG software comes with an optimized retrieval algorithm, that allows you to retrieve time and spectral informations in real time.

GigaHertz / low energy (pJ) measurement sample:

This is a FROG measurement performed with Fast FROG PS-700 with a low energy option and small beam option.

The measured laser was a SESAM modelocked VECSEL developed at ETH Zurich[1], assembled, amplified and CEO stabilized at the University of Neuchatel[2]. This was the very first measurement of a GHz rep. rate Laser with a single shot device.

1 D. Waldburger, S. M. Link, M. Mangold, C. G. E. Alfieri, E. Gini, M. Golling, B. W. Tilma, U. Keller, "High-power 100-femtosecond semiconductor disk lasers", Optica, vol. 3, No. 8, pp. 844-852, 2016

2 N. Jornod, K. Gürel, V. J. Wittwer, P. Brochard, S. Hakobyan, S. Schilt, D. Waldburger, U. Keller, T. Südmeyer, "Towards Self-Referencing of a VECSEL Frequency Comb", in ECLEO:2017, p. CF-1-4

Specifications:

 

Models STFE-FROG-FC600 STFE-FROG-FC400 STFE-FROG-FS600 STFE-FROG-FS400 STFE-FROG-PS600 STFE-FROG-PS400
Pulse duration [fs] 4 - 150 4 - 150 10 - 300 10 - 300 50-10,000⁴ 50-5,000⁴
Wavelength range [nm] 600-2000² 450-2000³ 600-2000² 450-2000² 600-2000² 450-2000²
Shot to shot measurement capacity 80 kHz with synchronisation / 40kHz without ¹
Input pulse repetition rate From Hz to GHz⁴
Input pulse energy [nJ]⁵ Single shot :>5000
1 MHz :>100
100 MHz :>5
1 GHz :> 0.05 (with low energy option)
Input polarization Linear vertical or horizontal
Detection CMOS 12 bit – 3Mpx – 72dB
PC interface USB 3 or GigE
Beam height [mm] 83-180
Dimensions [mm] 55x56x265 55x56x265 55x56x265 55x56x265 55x56x195 55x56x95

1. Over 80 kHz, the measurements are average over several shots. The number of shot shots depends on the laser rep rate (ex: 4 shots for 200 kHz). Devices with higher shot to shot measurement capacity can be made upon request.

2. The announced spectral range is the bandwidth accessible in factory. The customers have to choose a detection window of width Δλ within this range. Custom spectral window and spectral resolution can be made upon request.

3. The FC and FS models are non-dispersive and achromatic to achieve non-ambiguous phase retrieval.

4. Four pulse duration ranges available:

STFE-BOAR Series Autocorrelator Phase Retreival

BOAR stands for Biprism based Optical Autocorrelation with Retrieval.

This is a new technique of ultrashort pulses characterization relies on interferometric single shot autocorrelation and two photon absorption. The time delay is encoded into a spatial interferogram which is used to evaluate the pulse duration, the 2ω spectrum and the chirp. There is no non-linear crystal and no phase matching issues, the spectral working range is therefore very broad (1200 - 2400 nm).

The BOAR is actually combining all the advantages : simple, extremely robust, accurate and reliable measurements, spatially resolved, suitable for rather chirped pulses and the retrieval is done in real time directly by Fourier transformation. Two models are available for two different temporal windows.

Features:

Software interface:

Like every product, the BOAR comes with a powerful and very user friendly software, especially designed for touch screens, in order to give you the best user experience.

Specifications:

Models STFE-BOAR-FS STFE-BOAR-PS
Pulse duration range [fs] Sub-10 to 750 Sub-10 to 1350
Temporal window Δτ 3 ps 5.5 ps
Spectralrange (nm) 1200- 2400 nm ¹
Shot to shot measurement capacity 150 kHz with synchronisation
75 kHz without ¹
30 kHz with synchronisation
15 kHz without ¹
Input pulse repetition rate From Hz to GHz
Input pulse energy and average power (for 100 fs pulses) Standard models
Single shot: 100nJ
1 MHz: 5nJ / 5 mW
100MHz: 200 pJ / 20 mW
With low energy option
Single shot: 5nJ
1 MHz : 100 pJ / 100 μW
100 MHz : 10pJ / 1 mW
1 GHz : 1 pJ / 1 mW
Input polarization Any
Detection CMOS 12 bit – 6 Mpx – 72 dB
USB 3.1
CMOS 12 bit – 6 Mpx – 72 dB
USB 3.1
Dimensions [mm] 125 x 150 x 80 125 x 150 x 80

1. with a single optics set. The spectral range is directly accessible and there is no need for any manipulations.

2. Over 80 kHz, the measurements are average over several shots. The number of shots depends on the laser rep rate (ex: 4 shots for 200 kHz). Devices with higher shot to shot measurement capacity can be made upon request.

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