What is a femtosecond laser?

Femtosecond lasers are a subset of ultrafast lasers which emit optical pulses with a duration well below 1 ps, i.e., in the range of femtoseconds. 1 femtosecond (fs) = 10−15 s.  Such pulses are generated by modelocking, and the output can be used directly out of the femtosecond oscillator for some applications, or amplified to higher pulse energies for others.

Femtosecond lasers can be used for applications requiring either very high time resolution or very high peak intensity.  Because of their very short pulse duration they can be used as a “flash” to capture and resolve very fast processes such as molecular vibrations.  The short pulse duration and low duty cycle also means that the energy in each pulse is contained in a very short timescale, so that the peak power is extremely high.

Why is KMlabs unique in this field?

KMLabs specializes in lasers with very short, clean, high-contrast pulses, in conjunction with high average power and repetition rate tunability.

There are several key features that make the KMLabs Wyvern, Dragon, and Y-Fi series the best lasers on the market to meet the most demanding laser system requirements.

  • Pedestal-free pulses. The extremely low temporal pedestal content of the KMLabs WyvernTM and DragonTM series amplified ti:sapphire laser systems will prevent ns interactions by the pedestal from dominating sample interactions over fs and ps processes under study.
  • Broad repetition rate tunability and adjustable pulse length. The pulse energy, and pulse repetition frequency of the Wyvern can be changed by simply loading a preference file on the control computer. The pulse length can easily be tuned by a manual adjustment external to the laser.  This versatility will save time and money both during the near-term data acquisition, and in the future since service visits will not be required to adapt the laser to the latest data collection equipment.
  • Technical support to adapt and customize the laser system to meet program objectives.
KMLabs also specializes in custom-built laser technologies, leveraging our 20-year history of innovative development of cutting-edge high powered femtosecond lasers and accessories. We have delivered TW-class kHz lasers (25s, 25mJ, 1kHz) with exceptional beam quality and performance based on our cryo-cooled amplifier technology, as well as >30W kHz lasers.

The KMLabs team of engineers and laser designers will work closely with you to produce custom built lasers, from concept to production. Please Contact Us with your specific needs.

Patented Cryogenically Amplifier (US 6,804,287) Unique to KMLabs for single-stage amplifiers Cryogenic cooling of the amplifier crystal provides the best possible thermal management of the lasing medium available in the industry. This enables the broadest possible range of repetition rates and pulse energies while retaining excellent beam quality, stable divergence, and beam pointing.
Additionally, the industry-leading thermal management significantly increases power handling capability versus other Ti:sapphire lasers on the market and enables very low temporal pedestal content.
Pulse energy reaches >1.2 mJ at 10kHz and more at lower repetition rate Unique to KMLabs for pulse energy between 10kHz and 5kHz with a single-stage amplifier The consistently high pulse energy with minimum reaching at least 1mJ at all tunable repetition rate range ensures the customers have maximum flexibility in laser energy output.
Broad range of easily tunable dispersion 40fs to tens of ps Unique to KMLabs for the level of customization and the needed expertise. The feature of accessing broad range of tunable dispersion is not commonly offered in the market. The pulse length out of the Wyvern and Dragon series amplifiers can be tuned from 40 fs to tens of ps by adjusting the compressor that changes the total dispersion of the system. This can be done rapidly and repeatably to minimize data acquisition time. The broad range available pulse length gives the customer a large key parameter space to work with.
Patented fiber oscillator modelocking technology (US 8,416,817) KMLabs has the exclusive license The Y-Fi series of fiber laser products uses a patented modelocking technique which generates high-contrast, low pedestal pulses, unique in the fiber laser market

KMLabs Femtosecond Laser Product Lineup:

Product Center Wavelength Pulse Width Pulse Energy Average Power Repetition Rate
Y-Fi™ 1035 ± 5 nm < 150 fs > 0.45 µJ @ 10 MHz > 4.5 W @ 10 MHz .5 - 15 MHz
Y-Fi™HP 1035 ± 5 nm < 170 fs > 3 µJ @ 1 MHz > 20 W @ 10 MHz .5 - 15 MHz
Y-Fi™ ULTRA 1035 ± 5 nm < 190 fs > 40 µJ @ 500 kHz > 50 W @ 10 MHz .5 - 15 MHz
Y-Fi™ OPA 1250 -1800 nm Signal
2.4 - 4.4 μm Idler
options available
< 50 fs Signal
<100 fs Idler
> 0.4 µJ @ 1 MHz Signal
> 0.1 µJ @ 1 MHz Idler
> 0.4 W @ 1 MHz Signal
> 0.1 W @ 1 MHz Idler
1 - 2 MHz
2nd harmonic
(pumped by Y-Fi™ HP)
517 ± 3 nm < 150 fs > 0.8 µJ @ 10 MHz > 8 W @ 10 MHz  


Product Pulse Duration Repetition Rate Pulse Energy Average Power
Dragon™ D3 <25fs 1-3kHz 2.5mJ max 4.5W max
Dragon™ D3-HE <25fs 1-3kHz 5mJ max 5W max
Dragon™ D10 <25fs 5-10 kHz 1.5mJ max 10W max


Product Pulse Duration Repetition Rate Pulse Energy Average Power
Red Dragon™ 10 mJ <25fs 1-3kHz 10mJ max 10W max
Red Dragon™-20 mJ <25fs 1-3kHz 20mJ max 20W max
Red Dragon™ 30W <25fs 5-10kHz 5mJ max 30W max
Red Dragon™ 50W <25fs 5-10kHz 8mJ max 50W max


Product Pulse Duration Repetition Rate Pulse Energy Average Power
Red Wyvern™- 20mJ <40 fs 1-3kHz 20mJ max 10W max
Red Wyvern™- 30mJ <40 fs 1-3kHz 30mJ max 30W max
Red Wyvern™- 30W <40 fs 5-10kHz 5mJ max 30W max
Red Wyvern™- 50W <40 fs 5-10kHz 8mJ max 50W max


Product Pulse Duration Repetition Rate Pulse Energy Average Power
Wyvern™ 1000-10 <40 fs 1-10 kHz 4 mJ max 12W max
Wyvern™ 1000-HE <40 fs 1-3kHz 9 mJ max 10W max
Wyvern™ 1000-50 <40 fs 10-50 kHz 1 mJ max 12W max
Wyvern™ 500 <40fs 50-300 kHz 100 uJ max 5W max
Wyvern™ 500 HP <40 fs 50-300 kHz 200 uJ max 10W max