picoEmerald for CARS and SRS


The true one-box laser solution for CARS and SRS microscopy.

"In our search for a robust, fully automated tuneable light source optimal for coherent Raman microscopy, the APE picoEmerald-S clearly stood out. It has proven to be reliable with its ease of use and system integration capabilities essential for supporting access to a wide range of users in our facility." - Dr Alastair Wark, Technology and Innovation Centre, University of Strathclyde

The picoEmerald has been especially designed for the needs in CARS, picosecond coherent Raman microscopy, multimodal imaging and SHG/multiphoton fluorescence.

It comprises a high power (10W) picosecond oscillator, a frequency doubling to 532 nm and a synchronously pumped OPO (Optical Parametric Oscillator) in a single box. The optics modules were optimized by finite element analyses and mechanical stability algorithms (misalignment stability optimization) to exhibit maximum passive stability. In addition an active cavity control is maximizing continuously the efficiency of the pump laser and the OPO.

The picoEmerald supplies fully automated three temporally and spatially overlapping ultrafast pulse trains: 1064 nm out of the laser oscillator, the OPO Signal and the OPO Idler. Independent power adjustments of the 1064 nm beam and the OPO Signal and Idler, sensors for the spatial and temporal overlap and a high resolution spectrometer are included. 1064 nm pulses and OPO Idler pulses can be independently combined with the OPO Signal or blocked.

Vibrational excitation modes have a typical bandwidth of ~10 cm-1 thus requiring picosecond excitation pulses for best spectroscopic resolution. This system delivers 7 ps at 1064 and 5 - 6 ps from the OPO to match this requirement. Optionally an amplitude modulation of the 1064 nm beam up to 10MHz is available to suppress the non resonant background by Stimulated RAMAN Scattering (SRS) or heterodyne CARS microscopy.

Now the picoEmerald has shorter (2 ps) pulses and <10 cm-1 linewidth. With three-times shorter pulses than Nd:YVO-pumped OPOs and five-times higher Signal and SNR in SRS imaging (including video rate).


  • Fully remote controlled and hands-free
  • Three-colour output (Signal, Idler, 1064nm)
  • Perfect pulse synchronisation in space and time
  • Constant power control
  • Picosecond pulses for spectral resolution
  • Entire coverage from 720 cm-1 to 9000 cm-1
  • Ideal for non-laser experts



This product could be used for the following applications:

  • CARS
  • Pump probe spectroscopy
  • Raman spectroscopy
  • SRS (Stimulated Raman Scattering)
  • Nonlinear Microscopy
  • 2P/SHG Microscopy


This product is manufactured by APE GmbH.

Back to Top

Back to Top