venteon OPCPA


Specification / Features / Downloads

Le venteon OPCPA offre une combinaison unique de durée d’impulsion de quelques cycles avec une énergie d’impulsion de l’ordre du µJ à un taux de répétition élevé. L’excellente stabilité de sortie, et la possibilité d’avoir la stabilisation CEP, fait de cet amplificateur la source idéale pour des applications de spectroscopie non-linéaire, génération de hautes harmoniques et physique attoseconde. Contrairement aux concepts couramment utilisés d’amplification à base de Ti:Sapphire, le processus unique d’amplification paramétrique du venteon OPCPA donne lieu à bande passante de gain plus large qui maintient l’excellente durée d’impulsion de quelques cycles durant le processus d’amplification.

Spécification

Puissance moyenne>3 W Taux de répétition d'impulsion200 kHz to 1 MHz
Energie d’impulsion>3 µJ to >15 µJ* Direction d'impulsion<8 fs (measured)
Bande passante>300 nm (@-10 dBc) Bruit<1% RMS
Température de fonctionnement15 - 25 °C    
Low noise and high stability due to low timing jitter and direct seeding with a venteon dual front-end laser system.
 
* Higher amplified powers are available with upgraded configurations.

 

Laser Seed - venteon dual

The venteon dual represents the ideal front end for broadband few-cycle Optical Parametric Chirped Pulse Amplifier (OPCPA) applications. The octave spectral bandwidth of this laser allows for the generation of broadband sub-6 fs pulses as signal input for a subsequent parametric amplification stage as well as providing sufficient pulse energy (> 30 pJ @ 1030 nm) for seeding the fiber-based amplifier pump stage. The pulses are delivered by two separate output ports and are intrinsically self-synchronized with ultra-low timing jitter.

The first output provides the broadband signal pulses with a duration <6 fs. The pulses can be optionally CEP stabilised with the typical performance of the venteon CEP5 laser systems. The second output at 1030 nm delivers - without any additional broadening, directly from the octave spanning spectrum in a simple architecture and thus low noise long-term stable - more than 30 pJ in a spectral bandwidth of 10 nm (FWHM) and is ideally suited as the narrowband seed for the OPCPA pump amplifier.

When fitted with CEP stabilization, the CEP5 stabilization scheme allows for direct use of only the edges of the octave spanning spectrum as input into the almost common path configured f-to-2f interferometer, making very efficient use of the oscillator output in a configuration for maximum stability.

The venteon dual is based on a compact monolithic design with water cooled housing for temperature stabilization and computer controlled self-starting and maintaining mode-locking.

Fiber amplifier for OPCPA pumping

The venteon OPCPA pump module has been developed to amplify the 1030 nm low-energy pulses generated by the venteon dual with a specially designed preamplifer and main amplifier unit to more than 150 µJ.

The venteon pre-amp module is completely fibre-based and thus alignment free, enabling flexibility in delivered repetition rate, a high degree of integration at a very compact form factor.

The iterative stretching, reduction of repetition rate with fast pulse pickers, and amplification of the pulses being implemented in an all-fibre technology avoids coupling losses and enables a high overall efficiency as well as long term stability. Sophisticated dispersion management is implemented to match the higher order dispersion of the compression gratings (behind the main amplifier) in the fibre Bragg grating based stretcher. The preamplifier offers high pulse contrast and more than 600 mW output power in a range from 200 kHz – 2 MHz.

The output of the pre-amp module is directly fed into a single rod-type fibre amplifier for power amplification to more than 40 W (uncompressed).  An efficient compression stage is used to achieve a pulse duration below 350 fs with clean temporal profile. After frequency doubling the pulses are ideally suited for pumping the OPCPA signal amplification stage.

The amplifier pump system is fitted with internal diagnostics for status of the system allowing a one-button start function operated from within the control electronics.

 

OPCPA Amplifier

After frequency doubling of the high power 1030 nm pump beam, the ultrabroad signal is amplified in two parametric amplification stages supporting the large oscillator bandwidth of 650 to 1100 nm. As this process is highly efficient, no complicated multipass arrangement is required.

The extremely large gain bandwidth and the parametric amplification process allows for high energy pulses at extreme short pulse durations. With the bandwidth of the signal pulses (the output from the oscillator), the dispersion of the crystals for the parametric amplification is sufficient for stretching the pulses to safe peak power levels while being amplified allowing for recompression in a mirror-based compressor with high throughput and well-matched high order dispersion from sophisticated dispersion engineering.

The final amplified pulses therefore retain the ultra-broad spectral bandwidth of >300 nm (at -10 dBc), short pulse durations of <8 fs and high energies of >10 µJ at high repetition rates of 200 kHz or > 1 µJ at 2 MHz.

Using a minimal stretching ratio of the pulses allows for lowest CEP noise of the amplified pulses (when fitted with this option). The system features an excellent OPG suppression for high contrast amplified pulses.

An active timing synchronization between pump pulse and Signal pulse ensures long-term stable operation at low noise. Additionally, an active beam pointing stabilization of the pump and signal beams is included to keep the spatial overlap in the crystals as constant as possible leading to a very stable long term performance.

The overall OPCPA system is built onto a water cooled baseplate for temperature stabilization and fitted with safety interlocks and features remote connection capability for several aspects.

Due to the low noise pump and signal generation by the DUAL front-end, the unique CEP5 characteristics of the venteon product line is intrinsically preserved in the OPCPA. A slow feedback loop is implemented for any CEP stabilized OPCPA which corrects for drifts and allows for long-term CE phase stable operation. Thus the venteon OPCPA is an ideal tool for highly intense, CEP sensitive measurements.

 

Customisation

The venteon OPCPA is a flexible system that can be customised to suit the desired application. Perhaps you need access to the unamplified signal beam, the amplifeid 1030 nm or the uncompressed amplified beam. If you would like to discuss your application and what Laser Quantum can do to tailor the system to your requirements, please contact us.

Available Options

A range of options can be selected for the OPCPA including:

·         CEP-ready configuration (for CEP5 stabilization scheme)

·         Two colour output optically synchronized with the OPCPA

o   Amplified output at 1030 nm

o   Amplified output at 515 nm

·         Multiple rep-rate configurations  (changing rep-rate by a push button, for a pre-defined prior discussed set of rep-rates)

·         Pulse duration characterization unit SPIDER

With the two colour output, the OPCPA pump and the 1030 nm / 515 nm output can be individually optimized, subject to individual system design.

Please contact your sales representative if you are interested in these features.  

Upgradeability

In addition, the Laser Quantum standard product lines have numerous well defined paths to upgrade your system.  We understand that the demands of your experiments often change over time, and it is necessary to have more parameter space to investigate. Whether you require higher energy, higher repetition rate, or modular system purchase phases, please discuss your options with your sales representative.

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