LightWire FFS series

Compact Fiber Seeders for Femtosecond Lasers
  • For femtosecond CPA systems
  • Up to 200 mW; up to 250 nJ per pulse
  • Compressed or chirped pulses, chirp shaping
  • < 140 fs after compression
  • kHz up to MHz pulse repetition rates
  • For femtosecond CPA systems
  • Up to 200 mW; up to 250 nJ per pulse
  • Compressed or chirped pulses, chirp shaping
  • < 140 fs after compression
  • kHz up to MHz pulse repetition rates

Features & Applications


  • Pulse energy > 250 nJ at repetition rate < 200 kHz (for FFS200CHI)
  • Compressed or chirped broadband pulses
  • Pulses compressible down to < 200 fs (for FFS100CHI) and < 250 fs (for FFS200CHI)
  • Pulse duration < 140 fs (for FFS200)
  • PLL option (please inquire
  • Other wavelengths available on request


  • Seeding femtosecond CPA systems
  • Ultrafast spectroscopy
  • Time-domain terahertz spectroscopy


LightWire FFS series fiber lasers are dedicated for seeding solid state femtosecond Yb:YAG, Yb:KGW, Yb:CALGO based CPA systems. Ekspla offers FFS lasers either with femtosecond pulse duration directly from fiber, or with chirped pulses.

Broad up to 15 nm spectral bandwidth enables amplification of pulses with < 200 fs compressed duration. Special feature of FFS200CHI laser is customizable chirp profile to match compressor design of the CPA system.


Central wavelength 2)1030 ±1 nm1064 nm
Typical spectral bandwidth (at FWHM)up to 15 nm> 20 nm
Pulse durationUp to 30 ps,
compressible down to < 200 fs
> 50 ps
compressible down to < 250 fs
< 140 fs
Chirp profilelinear, custom 3)NA
Oscillator pulse repetition rate50 ± 2 MHz
Pulse repetition rate with pulse picker 4)25 kHz – 50 MHz
(PRR = PRROSC/N, N=1,5,6...,2000)
100 kHz – 50 MHz
(PRR = PRROSC/N, N=1,5,6...,500)
25 kHz – 50 MHz
(PRR = PRROSC/N, N=1,5,6...,2000)
Output power (without/with pulse picker)> 50 mW / > 25 mW> 200 mW at 10 MHz
> 100 mW at 1 MHz
> 25 mW at 100 kHz
> 200 mW / > 100 mW
Pulse energy (without/with pulse picker)> 1 nJ / > 0.5 nJ> 250 nJ at repetition rates < 200 kHz> 5 nJ / > 2.5 nJ
Polarizationlinear, > 100:1 extinctionlinear, > 10:1 extinction
Optical outputFC/APC connector or collimator with mounting flange (optional)collimator and isolator node 5)FC/PC connector 6) or collimated beam (optional)
Output fiber lengthup to 5 mup to 3 mup to 2 m
Beam diameter0.9 ± 0.1 mm
Beam heightNA38 mmNA
Beam qualityM2 < 1.1M2 < 1.5
Pulse train monitoringphotodiode output for oscillator train, TTL synch pulse for laser output (when pulse picker included)
Dimensions of collimator (D×L)Ø33.02 × 11.76 mm
Control interfaceCAN (USB, RS232, LAN optional)
Power supply (AC/DC adapter included)
100 – 240 V, 50 – 60 Hz AC
Power consumptionmaximal 230 W (typical 60 W)
Operating conditions10 – 30 °C, humidity – not condensing
  1. Due to continuous improvement all specifications are subject to change without notice.
  2. Other wavelengths available on request for FFS100CHI/FFS200CHI.
  3. Chirp profile will be optimized by Ekspla to match customer compressor design.
  4. Pulse picker is an option for FFS100 and FFS200 models. It supports external gating. FFS200CHI includes internal frequency divider, which enables pulse repetition rate reduction but does not support external gating.
  5. FFS200CHI model is provided with collimator & isolator node with dimensions 138×66.6×52 mm.
  6. The connector is not suitable to connect with single mode fiber.




Found total :
3 articles, 3 selected
Application selected :
All Applications
Laser Spectroscopy
THz Spectroscopy
Scientific Applications
Seeding and pumping
Supercontinuum Generation
All Applications

Compact, low-cost, and broadband terahertz time-domain spectrometer

Related applications:  THz Spectroscopy

Authors:  N. Couture, J. Schlosser, A. Ahmed, M. Wahbeh, G. Best, A. Gamouras, and J. Ménard

Terahertz time-domain spectroscopy (THz-TDS) is a powerful technique that enables the characterization of a large range of bulk materials, devices, and products. Although this technique has been increasingly used in research and industry, the standard THz-TDS configuration relying on the use of a near-infrared (NIR) laser source remains experimentally complex and relatively costly, impeding its availability to those without the expertise to build a high-performance setup based on nonlinear optics or without the financial means to acquire a commercial unit. Broadband THz-TDS systems require an even larger financial investment, primarily because the generation and detection of spectral components exceeding 3 THz typically need an ultrafast NIR source delivering sub-100-fs pulses. Such an ultrafast source can be bulky and cost upwards of $100,000. Here, we present a broadband, compact, and portable THz-TDS system comprising three modules that allow for the implementation of a single low-cost ultrafast laser, hence significantly decreasing the overall cost of the system. In the first module, the output laser pulses are spectrally broadened through nonlinear propagation in a polarization-maintaining optical fiber and then temporally compressed to achieve a higher peak power. The other two modules utilize thick nonlinear crystals with periodically patterned surfaces that diffract NIR pulses and optimize the efficiency of THz generation and detection processes by enabling a noncollinear beam geometry. Phase-matching conditions in the nonlinear crystals are controlled by the period of the gratings to gain access to a large spectral THz bandwidth. The whole system, combining these three modules, provides access to a THz spectrum peaking at 3.5 THz and extending beyond 6 THz with a maximum dynamic range of 50 dB for time-resolved spectroscopy applications. We demonstrate the functionality of this configuration by performing THz spectroscopy measurements of water vapor contained within a closed cell. Our compact system design paves the way towards a high-performance, yet cost-effective, THz-TDS system that can be readily used in academia and industry.

Published: 2023.   Source: Appl. Opt. 15 (62), 4097-4101 (2023)

Terahertz Spectroscopy for Gastrointestinal Cancer Diagnosis

Related applications:  Laser Spectroscopy THz Spectroscopy

Authors:  F. Wahaia, I. Kašalynas, G. Valušis, C.D. Carvalho Silva, P.L. Granja

In this chapter, we present a number of sensitive measurement modalities for the study and analysis of human cancer-affected colon and gastric tissue using terahertz (THz) spectroscopy. Considerable advancements have been reached in characterization of bio-tissue with some accuracy, although too dawn, and still long and exhaustive work have to be done towards well-established and reliable applications. The advent of the THz-time-domain spectroscopy (THz-TDS) test modality at a sub-picosecond time resolution has arguably fostered an intensive work in this field’s research line. The chapter addresses some basic theoretical aspects of this measurement modality with the presentation of general experimental laboratory setup diagrams for THz generation and detection, sample preparation aspects, samples optical parameters calculation procedures and data analysis.

Published: 2017.   Source: A Cutting Edge Technology, Jamal Uddin, IntechOpen

On-chip visible-to-infrared supercontinuum generation with more than 495 THz spectral bandwidth

Related applications:  Seeding and pumping Supercontinuum Generation

Authors:  Jörn P. Epping, Tim Hellwig, Marcel Hoekman, Richard Mateman, Arne Leinse, René G. Heideman, Albert van Rees, Peter J.M. van der Slot, Chris J. Lee, Carsten Fallnich, Klaus-J. Boller

We report ultra-broadband supercontinuum generation in high-confinement Si3N4 integrated optical waveguides. The spectrum extends through the visible (from 470 nm) to the infrared spectral range (2130 nm) comprising a spectral bandwidth wider than 495 THz, which is the widest supercontinuum spectrum generated on a chip.

Published: 2015.   Source: Opt. Express 23, 19596-19604 (2015)

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