2123 4th Street, Berkeley, CA 94710
Tel: 510-644-1869, Fax: 510-644-0118
e-mail: tech@femtochrome.com; http: www.femtochrome.com

FR-103XLRAPID SCANNING AUTO/CROSSCORRELATOR
Specifications:•••••••••••

Resolution: < 5fs
Wavelength Range: 410-1800nm
Minimum Pulse Width: < 5fs
Maximum Pulse Width: 90ps

Scan Range: > 175ps
Sensitivity: (PavPpk)min = (10)-7W2
Fiber Coupled/Free SpaceInterferometric/Noncollinear
Low Rep Rate Option
Computer Data Acquisition Option
VGA Display Option

The FR-103XL is a dispersion-free auto/crosscorrelator for monitoring the temporal width ofultrashort optical pulses. Offering unsurpassed sensitivity and resolution, it is compact and easy
to operate. The FR-103XL is ideally suited for the measurement weak signals as common in
optical communications, as well as pulses from other mode-locked lasers such as Ti-Sapphire.
DISPERSION-FREE, HIGH RESOLUTION
Material dispersion is nonexistent in the FR-103XL. Using high reflective metallic-coated optics[the only transmissive element is an ultrathin (~1µm) pellicle beam splitter], an unprecedented
resolution of < 5fs [limited only by the NL crystal thickness] is attained.
ROTATING PARALLEL MIRROR ASSEMBLY
Periodic delay is introduced by means of arotating parallel (//) mirror assembly*. This
unique mechanism results in reliable and errorfree delay generation. Large delays are easily
generated, with dispersion-free interferometricresolution.
* Z.A.Yasa and N.M.Amer, Optics Commun., V36,406 (1981)

WIDE SCAN RANGE/LINEARITY
The delay generated by the // mirror assembly is an exact sinusoidal function of time. The entire
scan range occurs for small angles, for which the linear approximation is excellent. The error in
the measured autocorrelation FWHM is <0.5%, even for pulses as long as 100ps. With its highresolution and wide scan range, the FR-103XL is ideally suited for simultaneously monitoring fs
pulses and satellite pulses that may trail by many psecs. The wide scan range is also criticallyuseful to observe adjacent pulse correlations and pulse extinction ratios in > 10GHz opticaltelecommunication signals.

CROSSCORRELATIONThe FR-103XL has a built-in auxiliary port for crosscorrelation. Two spatially separate
synchronized beams can readily be set for crosscorrelation. No additional optics is needed for thismode of operation.
OPTIONS:WAVELENGTH RANGES (/KDP/BBO/IR)
Three optimum NL crystals provide operation over a range of 410-1800nm. The standard unit
includes a KDP crystal (0.3mm) [530-1100nm](/KDP). The addition of a BBO (0.3mm)[410900nm] extends the short wavelength range(/BBO). A LiIO3 crystal (1mm)[700-1800nm], a redextended PMT and an IR beam splitter extend the long wavelength range (/IR). Crystals are AR
coated and include fundamental blocking filters, covering their operation range. For long term
reliability, a desiccator is provided to protect the crystals when not in use. NL crystals of any
type, thickness (<25µm) and cut can be provided for a specific application.
INTERFEROMETRIC OPTION (/IO)
The FR-103XL's standard configuration uses
the non-collinear (background-free) SHG
method. As an option, a plane mirror/mount isprovided for collinear autocorrelation withbackground. Using the highest resolution
setting (1fs) of its integration-time switch, theinterferometric response of the FR-103XL isrevealed,leadingtofringe
resolved
autocorrelation. [This mode is of low
gain/integration, requiring higher inputintensity].

HIGH SENSITIVITY OPTION (/HS)
The FR-103XL is perfectly suited to monitor
pulses from low power lasers. The standard noiseequivalent signal level of PavPpk= 0.5(10)-6W2[using a 1mm LiIO3, and 1ps integration] isfurther improved using the High Sensitivity
Option (/HS) to (PavPpk)min = 10--7W2.
FIBER ADAPTER OPTION (/FA)
An optional mount is attached on the input variable aperture of the FR-103XL, for easy
connection of fiber-coupled beams. Factory aligned, repeated connections without realignment isfacilitated. Connector options other than the standard FC/PC or FC/APC are available. This
option can also be applied to the crosscorrelation port.
FIBER COUPLED OPTION (/FC)
For telecommunication applications, a fixed fiber input is provided rather than the removable(/FA). This option with all alignment controls eliminated renders the instrument utmostly robustand plug-and play. The optics is optimized for 1300-1600nm. Input connectors can be customer
specified [FC/PC, FC/APC or others].
LOW REPETITION RATE OPTION (/LRR)
The rotation rate of the // mirrors is locked to the repetition rate (or submultiple) of the input
beam, with linear phase modulation. Using this option in conjunction with the /CDA or /VGA
options, autocorrelation traces are collected in typically < 30 secs for any rep rate (as low as4Hz), and continuously monitored on the display.
COMPUTER DATA ACQUISITION OPTION (/CDA)An A/D converter board with an RS232 interface is incorporated into the FR-103XL, and traces
are displayed on a PC using its associated software. Delay is exactly computed, eliminating any
trace nonlinearity. Continuous average, running average, fitting and pulsewidth readout withstandard pulse shapes are featured. Data can be stored and printed. A laptop PC (/PC) can beadded to this option for a factory tested complete system.
VGA DISPLAY OPTION (/VGA)
As an upgrade of the /CDA, an embedded PC and a 640x480 VGA display can be added to theFR-103XL, rendering the instrument fully complete with measurement, display and data analysis,storage and printing capability in a single, compact enclosure. [/CDA is included in this option.]
WIDE SCAN (WS)A new modified version FR-103WS, encompassing all the features of the standard FR-103XL,
provides a scan range > 400ps.

SPECIFICATIONS
Pulse width resolution (0.05mm crystal): < 5fs
Scan Range:>175psMinimum Pulse Width:
Maximum Pulse Width:

< 5fs
90ps

Pulse width Error:
Wavelength Range:
Noise Equivalent Signal (1mm LiIO3):
Input Polarization:
Dimensions:<1%410-1800nm
PavPpk= 10-7W2 (w/HS option)
Vertical6" x 6" x 12.5"

FEMTOCHROME RESEARCH INC.
2123 4th Street, Berkeley, California, USA
Tel: (510) 644-1869, Fax: (510) 644-0118
e-mail: tech@femtochrome.com; http://www.femtochrome.com