2123 4th St., Berkeley, CA 94710 Ph#: 510-644-1869, Fx#: 510-644-0118
e-mail: sales@femtochrome.com;
http: www.femtochrome.com

FR-103HP AUTO/CROSSCORRELATOR
Specifications:* Resolution: ~ 1fs* Minimum Pulsewidth: < 5fs* Maximum Pulsewidth: ~ 30ps
* Scan Range: > 75ps
* Sensitivity: [PavPpk]min=10-2W2* Wavelength Range: 700-5000nm* Background-free (Non-collinear SHG)
* Fiber Coupled/ Free Space* Any rep rate > 4Hz (w/CDA)* Computer Data Acqusition Option

The FR-103HP is a dispersion-free, 'real-time' NL crystal auto/crosscorrelator for the measurementof temporal width of ultrashort laser pulses. It is a cost-effective, compact model suitable formedium/high power modelocked lasers with subpicosecond durations.

ROTATING PARALLEL (//) MIRROR ASSEMBLY

Rapid scan, periodic optical delay is introducedby means of a parallel (//) mirror assembly.*
This unique mechanism results in uniform anderror-free delay generation. Large delays areeasily generated, with dispersion-freeinterferometric resolution.
The delay generated by the // mirror assembly is anexact sinusoidal function of time. Since the entire scan range occurs within small angles, linear
approximation is excellent.

_____________________________________*Z.A.Yasa and N.M.Amer, Optics Commun., V36, 406 (1981)

DISPERSION-FREE, HIGH RESOLUTION

Dispersion is negligible in the FR-103HP for pulsewidths down to <5fs. Using high reflective metalliccoated optics [the only transmissive element is an ultrathin (<<1um) pellicle beamsplitter],an unprecedented resolution approaching 1fs (limited only by the NL crystal thickness) is attained,
rendering the FR-103HP capable to measure a ~ 5fs pulsewidth.

WAVELENGTH RANGES (/BBO/KDP/IR)

Three optimal NL crystals provide operation to ~ 5000nm. The standard unit comes with one NL
crystal, customer specified:
/KDP
/IR

700-1100nm
850-5000nm.

These BBAR coated NL crystals accept vertically polarized input beams and fundamental
blocking filters are provided for their operational range. For long term reliability, a desiccators isprovided to protect the crystal when not in use. The standard NL crystal thickness is customer specified(0.1mm/0.3mm/1mm), with attention to the trade-off between resolution (thinner NL crystal) andsensitivity (thicker NL crystal).
Generally, a 0.3mm crystal thickness can be considered sufficient for pulsewidths down to ~30fs. With
shorter pulses, a thinner crystal is necessary. For <10fs pulsewidths, a custom (<25µm) NL crystal
thickness will need to be specified.

DETECTOR (PD) MODULES (/xxxx)
The FR-103HP comes with easily exchangeable plug-in photodiode (PD) detector modules (/xxxx)
covering a wide range of wavelengths. The selections are:/700/1100/2200/3000

700 -1100nm
1100-2200nm
2200-3400nm
3000-5000nm

Sensitivity of PD modules is orders of magnitude lower as compared to PMT detection (such as w/FR-103XL Autocorrelator), since they do not have the gain as provided by a PMT. Typically, aminimum of ~ 5mW avg. power is needed with a subpicosecond mode-locked pulse.

Commercial fiber laser (4mW/50MHz/1550nm) pulse of 500fs width measured by the FR-103HP

SLOW SCAN OPERATION
There are two modes of operation for the // mirrors in the FR-103HP:
1. Uniform rotation (with refresh rate typically 2Hz)
2. Controlled movement such that the // mirrors slow down greatly (4 selectable speeds ) over a period
when the pulses on the two arms of the Michelson Interferometer set-up are overlapping. The// mirrors speed up outside this range, to return quickly for a repetition of the cycle. This mode
renders the FR-103HP suitable for 'real-time' autocorrelation of lasers with any rep rate > 500Hz. Thisis particularly useful for kHz amplified lasers.

OPTIONS:FIBER ADAPTER OPTION (/FA)
An optional gimbal mount with a collimator is installed over the variable input aperture of theFR-103HP, for easy connection of fiber-coupled beams. Factory aligned, repeated connections without
a need for realignment is facilitated. The /FA is easily removable for a free-space input beam. Its
standard adapter is FC [FC/PC or FC/APC]. For operation at 1550nm, a PM-DSF patchcord can be
attached to the /FA. The collimator of the /FA is focus adjustable to obtain good collimation if it needs
to be used at greatly different wavelengths. A ƛ/2 plate holder is also provided within the /FA assembly,
for users to install one for their wavelength of operation, if needed for polarization control.
The /FA option can also be applied to the CC port [/FA(CC)].

COMPUTER DATA ACQUISITION OPTION (CDA)
A data acquisition board is installed in the FR-103HP/CDA, providing an interface (USB) with any
PC w/ Windows OS. Its associated software allows traces to be displayed, analyzed (averaged and/or fit
with Gaussian and Sech2) and saved.

SPECIFICATIONS:* Resolution: ~ 1fs* Minimum Pulsewidth: < 5fs* Scan Range: > 75ps
* Sensitivity: [PavPpk]min=10-2W2* Wavelength Range: 700-5000nm* Background-free (Noncollinear SHG)
* Fiber Coupled/ Free Space* Any rep rate > 500Hz (>4Hz w/CDA)* Computer Data Acquisition Option

2123 4th Street, Berkeley, CA 94710 Ph#: 510-644-1869, Fx#: 510-644-0118
e-mail: sales@femtochrome.com;
http: www.femtochrome.com