Fast Scan Ultra Short Pulse Measuring Instrument - Fast Frequency Resolution Optical Switch - ROGscanUltra

Fast Scan Ultra Short Pulse Measuring Instrument - Fast Frequency Resolution Optical Switch - ROGscanUltra Product Description:

Frequency resolved optical switch (FROG) is a commonly used pulse measurement system. Fast scan ultra short pulse measuring instrument - Fast frequency resolution optical switch - ROGscanUltra has high accuracy, complete functions, strong adaptability, and is easy to use, which can meet all your pulse measurement needs. Like the standard FROGscan, the FROGscan Ultra can easily measure highly complex pulses, but offers a wider wavelength range, higher resolution, and a dynamic range of up to 75dB. Whether adjusting the laser system or measuring shape pulses, FROGscan Ultra is the preferred pulse measurement system. The system adopts high-precision and high-speed mechanical optical delay, which is at least 10 times faster than other optical delay lines, higher than the dynamic range and resolution of similar products, and can measure highly regular pulses and high-order phase distortions. In addition, different ranges of wavelengths and pulses can be measured by flexibly replacing SHG crystals and spectrometers. According to the shortest pulse to be measured (<5fs or 10fs), two different FROGscan Ultra models can be selected.

Our FROGscan system can also perform measurements that other FROG devices cannot, such as measuring a 10fs laser pulse chirp exceeding 10ps. Any system that uses SHG crystals as dispersion elements cannot handle the combination of pulse length and bandwidth. But FROGscan can easily complete such measurements. The supporting software VideoFROGScan uses the patented PCGP algorithm to restore pulses, including all the characteristics required for real-time pulse measurement and analysis.

Working Principle:

The basic method of FROG is to split the measured pulse into two beams through a beam splitter, with one beam introducing an adjustable time delay, and then allowing the two beams to interact through a frequency doubling crystal to produce a frequency doubling signal light. After spectral expansion of the signal light by a spectrometer, the signal Esig (t, τ) is calculated, and Fourier transform is performed to obtain the frequency domain signal Esig (ω, τ). Then, the experimentally measured I FROG (ω, τ) is used to replace the amplitude of the signal Esig (ω, τ) to obtain the new Esig (ω, τ). After inverse Fourier transform, the new Esig (t, τ) is obtained. With certain constraints, the new E (t) is calculated from the new Esig (t, τ) as the initial value for the next iteration. Repeat this process until the FROG pattern error reaches an acceptable value to become the FROG trace, and recover the amplitude and phase distribution of the pulse from the FROG trace.

FROG system components&optical path schematic:

Technical Specifications:

• environmental parameters
• Operating temperature:+10 ° C to+40 ° C
• Storage temperature: -30 ° C to+70 ° C
• Air humidity: 95%, no condensation

Product Parameters:

• Product size: 30cmx30cm
• Pulse width range: 5fs ->10ps
• Wavelength range: 450-4500nm (other wavelengths can be customized)
• Time domain range: 30ps
• Time domain resolution: 2fs
• Delay increment: 1fs
• Spectral resolution: 0.05nm-1nm
• Spectral range: 100nm-600nm
• Pulse complexity: TBWP>50
• Strength accuracy: 2%
• Phase accuracy: 0.01 rad
• Real time sensitivity: 4 W ²
• Average sensitivity: 0.01W²
• Input spot size: φ 2-4mm
• Polarization direction: horizontal
• Acquisition speed:>2 Hz (64 x 64 grid)
• Measure the required spectrum: grid width
• Software application: Supporting VideoFROGscan

Fast scan ultra short pulse measuring instrument - Fast frequency resolution optical switch - ROGscanUltra test result interface:

The pulse width, pulse shape, and spectral information of the laser under test can be easily read in the following figure.