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 measurement of temporal width of ultrashort laser pulses. It is a cost-effective, compact model suitable for medium/high power modelocked lasers with subpicosecond durations.
ROTATING PARALLEL (//) MIRROR ASSEMBLY
Rapid scan, periodic optical delay is introduced by means of a parallel (//) mirror assembly.* This unique mechanism results in uniform and error-free delay generation. Large delays are easily generated, with dispersion-free interferometric resolution.
The delay generated by the // mirror assembly is an exact 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 700-1100nm
/IR 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 is provided 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) and sensitivity (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:
/700 700 -1100nm
/1100 1100-2200nm
/2200 2200-3400nm
/3000 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, a minimum 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. This is 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 the FR-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.
商品属性 [最小精度] 1fs [波长范围] 700-5000nm [扫描范围] > 75ps [Input pulse duration range] < 5fs~ 30ps