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High-Accuracy Pulse Stretcher for High-End Ultrafast Lasers

Pascal Deladurantaye

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The PowerSpectrum™ HPSR fixed-dispersion pulse stretcher is a compact, robust and cost-effective solution for dispersion management in chirped-pulse amplification (CPA) ultrafast laser systems that use either a Volume Bragg Grating (VBG) or a diffraction grating (Treacy) compressor. The all-fiber construction creates a compact and environmentally stable package suitable for a variety of demanding applications. Many features, such as spectral profile, reflection bandwidth, and dispersion rate, can be tailored to user specifications.

Early on, TeraXion recognized the emerging importance of ultrafast fiber lasers for industrial and medical applications. The HPSR is a customizable and cost-effective fixed-dispersion pulse stretcher that enables ultrafast laser systems to generate clean pulses as low as 150 femtoseconds.

The PWS-HPSR features a gain bandwidth enhancement option that enables spectral shaping of the input pulse before amplification. This counteracts gain narrowing and allows for shorter amplified pulse.

The unmatched design and flexibility of the HPSR enables us to create customized chirped FBGs (CFBGs) to satisfy the unique dispersion concerns of individual customers.

Our superior manufacturing methods minimize phase errors, allowing the faithful recompression into clean pulses as low as 150 fs.

To learn more about TeraXion's Twin Peaks, read our application note


Top 5 Features



The compact, all-fiber construction remains operational in changing environmental conditions.



The all-fiber construction of the HPSR eliminates the weight and size of stretchers based on bulky, free-space optical components



The HPSR can be designed to compensate amplifier-induced nonlinear effects for optimal performance.


Low Cost

The ingenious, all-fiber design of the HPSR reduces overall system cost, minimizes maintenance and alignment, and increases productivity.



The HPSR is based on the technology of our Telcordia®-qualified telecom products, which are still operating after decades of use.

Critical technical specifications

Label Value

Center Wavelength

1 µm band

FBG Spectral Shape

Customizable, Flat Top, Twin Peaks

Total Stretching Window

Single FBG

800 ps

Double FBG

1 600 ps

Dispersion Profile

Matched to System