• Ultrafast fiber laser @ 920 nm
  • Unique approach: < 100 fs with > 1.5 W power
  • SAM mode locking, PM fiber based MOPA system
  • Robust, reliable, compact, cost-effective, push-button
  • Air cooled system, < 150 W power consumption

920 nm High-power Ultrafast Erbium Fiber Laser System

The FemtoFiber ultra 920 is a new member of TOPTICA's third generation of ultrafast fiber lasers. The system delivers laser pulses of less than 100 fs in duration at a central wavelength of 920 nm. The system provides more than 1 W average output power. It is a compact femtosecond laser system with turnkey operation and cost-effective design.

The pulses are generated using a SAM-mode-locked ring fiber oscillator (patented design), followed by a high-power fiber amplifier. For reaching highest reliability levels, only polarization-maintaining,  Erbium-doped fibers are used.

The oscillator and (pre-)amplifier generate pulses at a fundamental wavelength of 1560 nm. Depending on the model, different high-power amplifiers are boosting the output power. All of this is integrated in a unit with a footprint of 25 x 38 cm².  The laser system is easily controlled via Ethernet or USB. A simple graphics user interface (GUI) enables user-friendly access to all  laser parameters.

The FemtoFiber ultra series shares the advantages of TOPTICA’s previous ultrafast fiber laser generations. It is a compact laser system and works reliable just after a push-button start. No water-cooling is required since a simple air-cooling is sufficient for a stable operation of the system. It is a cost-effective and compact laser system that provides femtosecond pulses with high average power in the near-infrared with an excellent beam quality.  It is a great solution for applications in nonlinear microscopy like effective two-photon excitation of fluorescent proteins and SHG based contrast mechanisms.

Download datasheet here.

Download applications note here


Center wavelength 920 nm
Pulse duration < 100 fs
Average output power > 1.5 W
Repetition rate 80 MHz

Beam shape TEM00, M² < 1.2
Beam divergence < 1 mrad
Beam size (1/e²)  Ø 1.0 mm (typ.)
Linear polarization > 95 %, vertical
Output coupling Free space
Dimensions laser head 77 x 155 x 230 mm³ (H x W x D)
Weight laser head < 4 kg
Dimensions supply unit 134 x 483 x 600 mm³
Weight supply unit < 20 kg
Power supply 24V DC (AC power supply optionally included)
Power consumption < 150 W
PC Interface Ethernet, USB
Environment temperature 19 - 25 °C (operating), 0 - 40 °C (storage and transport)
Environment humidity Non-condensing


The FemtoFiber ultra 920 provides a small laser head with a footprint of 23 x 15.5 cm2. The laser head is designed to ensure minimum heat dissipation to its environment and therefore provides also highest stability for beam pointing. For more flexibility, the design also allows mounting the laser head into an integrators environment, even under various orientations (vertical/ horizontal/…). The laser system comes with an 19“-type standard rack (3 units height) control and supply unit which is connected via detachable fiber and electronic lines of typ. 2 meters length.

The system is controlled either manually by a simple emission push-button operation and also provides all necessary safety features complying with the latest laser safety regulations. Furthermore, the laser system can also be remote-controlled via Ethernet or USB. A simple graphics user interface (GUI) enables user-friendly access to all laser parameters.

The laser system is a great solution for applications in non-linear microscopy like two-photon excitation of fuorescent proteins and SHG based contrast mechanisms.

With the emission wavelength of 920 nm it provides highest power for especially green and yellow fluorescent protein markers (GFP, YFP) commonly used e.g. in neurosciences and other laser-related biophotonic disciplines. lt perfectly closes the wavelength gap in between the already existing FemtoFiber ultra systems at 780 and 1050 nm.
The above images have been recorded by the research group of Prof. Thomas Hellerer at the University of Applied Sciences in Munich, and are used with permission.


  • SHG imaging and microscopy
  • Multiphoton excitation
  • Advanced microscopy techniques
  • Neuroscience
  • Semicon inspection

Key Features:

  • SESAM mode-locked ring fiber oscillator
  • Patented and patent pending design (US 8,457,164)
  • Unique approach with < 100 fs pulses at > 1 W
  • Polarization maintaining fibers only
  • ,,Cold" and Compact laser head design
  • Optimized system design for OEM integration
  • Air-cooled system
  • Excellent price-performance point
  • 24 VDC power supply
  • < 150 W power consumption

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