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TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt
Telefon: +49 6151 4259 78
Telefax: +49 6151 4259 88 
E- mail: info [at] 

CrF Chromium Forsterite

Cr:Forsterite Femtosecond Laser


The chromium-forsterite laser produces femtosecond pulses in near-infrared around 1250nm. The oscillator can be directly pumped with CW lasers operating at 1064nm or with an Ytterbium fiber laser at 1054nm. That offers a significant reduction in system cost compared to femtosecond lasers pumped in the 532nm region. Three models come with a SESAM self starting operation, and one with an electric starter.


Bezeichnungen der Tabs

  • Description
  • Specifications
  • Pictures
Tab 1


  • Wavelength range: 1230-1270 nm
  • Short pulse duration down to <35 fs
  • Pulse energy >20 nJ at 30 MHz
  • Output power up to 800 mW
  • Integrated pump source option
  • SESAM or electromagnetic starter


  • Seed oscillator for amplifiers
  • Multi-photon excitation microscopy
  • Pump-probe spectroscopy
  • Generation of terahertz radiation
  • Time-resolved spectroscopy
  • Optical coherent tomography
The CrF chromium-forsterite laser offers a unique active media that radiates femtosecond pulses around 1250nm. The laser features an integrated Peltier TC with control unit for crystal cooling to lower temperatures for higher average power and precise temperature control. Three models of the laser feature SESAM self-starting with a fixed wavelength operation and one model features an electromagnetic starter and offers wavelength tunability. The CrF includes a built-in 15-W fiber pump laser and control unit. The 1250nm region offers new horizons for microscopy or brain tissue studies where fs pulses conquer new heights each year. CW version of the CrF is available separately as the LF-100 laser. The CrF laser can also be used as a seed oscillator for building high power Cr:F amplifiers also offered by our company.
Tab 2

  CrF-450TP CrF-400SP CrF-700SP CrF-
Pulse duration <65* fs <75 fs <75 fs <140 fs
 Average output power 
(at peak wavelength)
>450** mW   >400 mW  >700 mW  >560 mW
 Pulse energy  >4 nJ  >4 nJ >7 nJ  >20 nJ 
Built-in fiber laser power 15 W
Repetition rate (typical) 96 MHz 95 MHz 95 MHz 30+/-2 MHz (fixed)
Starting of femtosecond operation electric starter self-starting (SESAM)
Output stability <2% rms <5% rms
Spatial mode TEMoo
Polarization linear, horizontal
Divergence <2 mrad
Crystal cooling thermoelectric + closed-loop water chiller

* - down to 35 fs possible upon request;

** - up to 800 mW is possible upon request.

Tuning range, nm 1210-1290
Output power, mW* 400*
Spatial mode TEMoo
Bandwidth, 1/cm 10

* - 10 W pump

Tab 3

Tab 3 Inhalt

Tab 4

Tab 4 Inhalt

Tab 5
Bild 1
CrF-450TP and LF-100 CW 
Beschreibung 1
The CrF-450TP femtosecond laser and the LF-100 CW laser 
Bild 2
CrF dimensions 
Beschreibung 2
Cr:Forsterite femtosecond laser dimenions 
Bild 3
LF-100 dimensions 
Beschreibung 3
LF-100 CW laser dimenions 
Bild 4
Beschreibung 4
Bild 5
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Bild 6
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Bild 7
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Bild 10
Beschreibung 10