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APE picoEmerald Picosecond OPO

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APE picoEmerald Picosecond OPO

Ideally suited for CARS and SRS microscopy


The picoEmeraldâ„¢ has been the first fully automated tunable picosecond light source in the near infrared with few picosecond pulse width.

It is based on A·P·E’s long standing experience in building OPOs (optical parametric oscillators) combined with its expertise in electronic control and automation making the picoEmerald™ an everyday easy to use instrument in biological, medical, or physics labs.


  • Fully remote-controlled and hands free
  • Wavelength sweep function
  • Integration into remotely controlled experiments
  • Three output wavelengths perfectly overlapped in space and time monitored by sensors
  • Jitter free pulse generation
  • Constant power control loop
  • Picosecond pulses for best resolution in vibrational spectroscopy

Ideally suited for CARS and SRS microscopy (optional modulation of the 1064nm beam available)The picoEmeraldâ„¢ combines a picosecond OPO and its pump laser incorporated in a single housing with an integrated software control run from a Panel PC with a graphical user interface (GUI). It can be completely remote controlled by a user software or a microscope through a simple RS-232 interface. The optics modules are optimised by finite element analysis and mechanical stability algorithms (misalignment sensitivity optimisation) to obtain maximum passive stability of the sealed OPO compartment made in a monolithic design. The RS-232 allows the integration of the picoEmeraldâ„¢ into larger software run and controlled experiments. For fast remote diagnostics, the picoEmeraldâ„¢ has service capability via the internet using a LAN interface.

The OPO generates narrowband picosecond pulses from 720 - 990 nm and 1150 - 2030 nm with pulse widths of about 6ps. A part of the undepleted fundamental pump laser beam at 1064nm is available as well.

The wavelength of the OPO Signal is selected through the GUI and the actual wavelength is measured with a built-in real time high resolution spectrometer.

If desired, the wavelength can be actively held at the target wavelength for long time measurements.

To accommodate latest experimental needs, not limited to the above applications, a wavelength sweep function for spectra acquisition has been added allowing to automatically tune from a set start wavelength to a set end wavelength in short time, either with a predefined hold at each spectral step, or with advance for each step on a software trigger.

The three beams (OPO Signal, OPO Idler, and 1064nm pump laser fundamental) are available individually or at the same time in various combinations overlapped in space from a single beam output. They are also temporally overlapped via an internal delay line. The delay line is variable and computer controlled to allow few tens of picoseconds delay variation to accommodate possible dispersion that beams of different wavelengths may be exposed to when propagating through optical elements, e.g. in a microscope.

The above features have made the picoEmeraldâ„¢ well suited for CARS (Coherent Antistokes Raman Scattering) Microscopy, and the availability to modulate the 1064 nm beam (optional) enables novel variants of Raman Microscopy like SRS (Stimulated Raman Scattering) as well.

More applications are waiting to take advantage of the above features.

Optionally SHG and THG of OPO Signal and Idler are available as well as FHG of OPO Signal supplied in an additional housing (HarmoniXX series of frequency converters).


  picoEMERALD datasheet                                        Read more on APE's website