Lastek: Photonics Technology Solutions

The spectra of Laser Quantum's broadband venteon oscillators are difficult to measure with standard Si-based CCD-spectrometers. Limited by the detector sensitivity, these devices are only suitable to cover a spectral range up to 1050 nm, which is not enough for the broadband spectra of state-of-the-art femtosecond lasers such as venteon ultra, which cover a spectral range up to 1200 nm. So far only expensive and scanning optical spectrum analysers have been suitable for a reliable oscillator characterisation.

Download datasheet here. 

The Laser Quantum venteon SPIDER is the ultimate tool for highly accurate and unique real-time ultra-short pulse characterisation. It allows for a complete pulse reconstruction in the time and frequency domain down to sub-5 femtoseconds.

Download datasheet here.

The Laser Quantum venteon SPIDER HP is based on the ultrafast version, but optimised for longer pulses. For this purpose, the fundamental stretching of one pulse copy within the SPIDER and the spectrometer resolution have to be adapted for a sufficient sampling of the spectral phase.

Download datasheet here.

• Measures pulse duration in 10 fs – 20 ps range
• Single set of optics for 500 – 2000 nm range
• High resolution voice coil driven delay line
• Non‑collinear intensity and collinear interferometric autocorrelation traces
• Onboard pulse‑analysis software for pulse duration measurements
• Integrated controller and computer
• Non‑dispersive polarization control
• FROG and FTIR ready

Operation of the Light ConversionGECO autocorrelator is based on noncollinear second harmonic generation in a nonlinear crystal, producing intensity autocorrelation trace directly related to the input beam pulse duration. One arm of the fundamental pulse is delayed by means of a magnetic linear positioning stage, providing fast, reliable motion with < 0.15 fs resolution. GECO can acquire a full intensity autocorrelation trace of 10 fs to 20 ps pulses and covers the full 500 nm to 2000 nm wavelength range.

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• Ultrafast Pulse Width Characterization for 650 - 1100 nm
• For Pulses from 40 fs to 1 ps, or Pulses Down to 15 fs with Precompensation
• Selectable Gain up to 70 dB to Accommodate Large Range of Input Powers
• Interferogram Signal Output through BNC
• Scan Rate of 5 Hz
• Compact Footprint: 6.90" x 5.53" x 4.82"

Thorlabs' FSAC Interferometric Autocorrelator provides approximate pulse width measurements in the 650 - 1100 nm wavelength range. Well suited for diagnostics of femtosecond Ti:Sapphire lasers, it consists primarily of a modified Michelson interferometer with a nonlinear detector at the output.

A BNC connector outputs the autocorrelation signal, which can be viewed on any oscilloscope with >1.5 MHz bandwidth. An example of the direct output from the FSAC is shown in the graph to the right. A photodiode amplifier with selectable gain from 0 dB to 70 dB provides compatibility with a large range of optical input powers, up to a maximum average power of 150 mW.

Intuitive, easy-to-reach controls on the outside of the enclosure allow the user to optimize the resolution and fringe contrast. The controls for the delay arm enable a full scan range of 50 fs to 10 ps (i.e., ±25 fs to ±5 ps), and a micrometer tunes the detector's position for maximum signal.

This interferometric autocorrelation was obtained using teh Thorlabs Octavius® laser.  Precompensating Mirrors were used to chirp the beam prior to entering the autocorrelator.

Femtochrome manufactures state-of-the-art instruments for the characterization of ultrafast optical laser pulses.