The KMLabs Y-Fi™ laser series is a family of compact high average power, high repetition rate near-IR ultrafast Yb fiber lasers. Y-Fi™ products are based on a single rugged opto-mechanical platform and are engineered for hands-free operation.

The Y-Fi™ family employs a patented all normal dispersion (ANDi) modelocked Yb fiber laser coupled with a fiber amplifer. This configuration offers numerous unique advantages, including:

  • Bandwidth supporting sub-100 fs pulses
  • High output energy from oscillator requires less amplification for shorter, low temporal pedestal pulses
  • Robust long-term operation

The short, clean pulses of the Y-Fi™ laser series deliver more peak intensity than competing products. KMLabs guarantees both pulse duration and pedestal energy content, verified with a FROG pulse measurement, to ensure each laser pulse is free of picosecond background that robs energy from the main short pulse. Thus, more of the laser output is truly usable, requiring less energy/average power and decreasing the probability of seeing collateral damage and other detrimental interactions.


  • Average power: 4.5 W / 20 W / 35 W (Y-Fi™, / Y-Fi™ HP / Y-Fi™Ultra)
  • 100-200 fs pulse length with low pulse pedestal gives improved performance for driving nonlinear optical interactions: optimum efficiency at lower pulse energy / average power
  • Tunable repetition rate (0.5-15, 60 MHz)
  • Fully integrated, ruggedized, hands-free laser source
  • Stable over large temperature range (16-26°C)
  • Graphical, intuitive software control with integrated diagnostics
  • Computer controlled pulse width precompensation: optimize your experiment with no external prisms or gratings
  • No user adjustments on head
  • Small optical head footprint (~ 30 x 45 cm) for Y-Fi™ and Y-Fi™ HP
  • Pulse energies up to > 20 μJ, with custom higher power systems available


  • OPCPA seeding
  • OPA Pumping
  • Precision micromachining of tissues, glass and plastics