Output Characteristics

Interferometer Head MHz Detector
Delay Range 70 µm (150 µm optional)
Spectral Range2 650-950 nm
Accepted Repetition Rate ≥1 MHz
Input Level @ 800 nm >5 mW
Spectrometer Head
Spectral Range2 550-1050 nm
Resolution 1.5 nm
Input Options Free space or via fiber
PC Interface
Pulse Duration Evaluation 5-150 fs (5-350 fs optional)
Hardware Requirements (computer not included) 2x USB port (minimum 2.0); 1 GB RAM
1.5 GB hard disk space; minimum resolution 1024 x 768 px


  1. Due to our continuous product improvements, specifications are subject to change without notice.
  2. Standard version. For other wavelengths, please contact Spectra-Physics.



Combining data in the time and frequency domain allows efficient characterization, evaluation and documentation of the laser pulses. With the new compact design, Femtometer requires minimal space since it can be positioned either horizontally or vertically.


The Femtometer dispersion compensated design offers high fidelity pulse measurement down to 5 fs. It offers flexibility due to the removable detection modules, allowing the characterization of ultrafast oscillators using the MHz detector. Operation as a plain Michelson interferometer is also possible. Combined with a laptop computer (not included)for data acquisition, Femtometer yields a portable characterization tool offering several data export options.

Digital Storing Oscilloscope

The oscilloscope software module, designed to display the autocorrelation trace, offers a large display and all necessary settings for efficient, easy handling.

Spectrometer Module

The spectrometer software module shows the laser spectrum, including center wavelength and FWHM bandwidth.

Online Evaluation

Standard features are calculations of center wavelength, spectral width and pulse duration. The system is self-calibrating, based on the speed of light.