Polarization Gating Autocorrelator
نویسنده
چکیده
We have developed a portable, motorized, multi-shot, third-order autocorrelator capable of measuring the time width of a large bandwidth pulse with femtosecond acuracy. Here we give a detailed description of the device and report measurements made in the Pegasus laboratory on a Coherent Legend Elite laser system, generating a short pulse, (IR) λ = 800nm E < 3mJ , and a frequency tripled pulse, (UV) λ = 266nm E < 300μJ . Pulse lengths were determined to be 35fs and 90fs for the IR and UV pulses respectively. For a calibration we measured the index of refraction for a 1 4 in fused silica window, these results where in good agreement to Sellmeier equation with coefficients obtained from ’CVI Melles Griot’ website. Furthermore, we measured the dispersion of the IR and UV pulses through the fused silica to justify the assumption of a gaussian pulse with a trivial phase factor.
منابع مشابه
Investigation of depth selectivity of polarization gating for tissue characterization.
Polarization gating has been widely used to selectively probe the structure of superficial biological tissue. However, the penetration depth selectivity of polarization gating has not been well understood. Using polarized light Monte Carlo simulations, we investigated how the optical properties of a scattering medium and light collection geometry affect the penetration depth of polarization gat...
متن کاملA Novel Diagnostics of Ultrashort Electron Bunches Based on Detection of Coherent Radiation from Bunched Electron Beam in an Undulator
We propose a new method for measurements of the longitudinal profile of 100 femtosecond electron bunches for X-ray Free Electron Lasers (XFELs). The method is based on detection of coherent undulator radiation produced by modulated electron beam. Seed optical quantum laser is used to produce exact optical replica of ultrashort electron bunches. The replica is generated in apparatus which consis...
متن کاملLow Power, CMOS Digital Autocorrelator Spectrometer for Spaceborne Applications
A 128-channel digital autocorrelator spectrometer using four 32 channel low power CMOS correlator chips has been built and tested. The CMOS correlator chip uses a 2-bit multiplication algorithm and a full-custom CMOS VLSI design to achieve low DC power consumption. The digital autocorrelator spectrometer has a 20 MHz band width, and the total DC power requirement is 6 Watts.
متن کامل