THORLABS FSAC, User Manual

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Interferometric Autocorrelator Chapter 3: Description
Rev B, May 1, 2017
Page 3
Chapter 3 Description
3.1. Introduction
Thorlabs’ FSAC is an interferometric autocorrelator capable of quantitative and qualitative monitoring of ultrafast
pulses from tens of femtoseconds to 1 picosecond. A modified Michelson interferometer splits an input pulse into
two copies, modulates the delay between them, and recombines the pulses at a photodiode. Because the
photodiode is not responsive over the fundamental wavelength band of typical Ti:sapphire lasers, two-photon
absorption is required to generate photocurrent. This results in nonlinear responsivity in the detector which enables
the interferometric autocorrelation.
3.2. Shipping List
The FSAC consists of the following components:
 FSAC Autocorrelator
 CL5 Mounting Clamps (Qty. 2)
 5/32" Stubby Hex Key
 VRC2SM1 Fluorescent Alignment Disk
 SM1CP2 End Cap
 R1DS3N Alignment Reticle
 LDS1212 Power Supply