GEMINI an ultra-stable interferometer
GEMINI is a novel and compact interferometer that can guarantee very high robustness and stability between the two generated replicas of light. The exceptional performances of this device can be exploited in many dierent applications, such as time- and frequency-resolved uorescence, coherent Raman, pump-probe, two-dimensional spectroscopy and studies on single molecules.
Key Features
• High throughput that allows high sensitivities
• ≈1 attosecond stability between the two replicas of light
• Fast scans (<1 sec.)
• Scan range selectable by the user
• Compact and low-cost
• Insensitive to vibrations
Applications
• Interferometry
• Generation of pulse pairs
GEMINI IN DETECTION PATH
• Time- and frequency- resolved fluorescence
• Pump-probe spectroscopy
• Coherent Raman spectroscopy
GEMINI IN EXCITATION PATH
• Fluorescence Excitation-Emission Maps
• Characterization of single molecules
Time- and frequency-resolved fluorescence with a single TCSPC detector
Experimental setup: GEMINI interferometer is placed in collection before the detector (a SPAD or PMT) connected to a TCSPC. This allows one to resolve the uorescence wavelength axis while preserving the temporal resolution.
Coherent Raman (Stimulated Raman Scattering - SRS) and Pump-Probe Spectroscopy
Experimental setup: GEMINI interferometer is placed in the probe/Stokes beam after the sample, allowing one to measure SRS or pump-probe spectra up to MHz modulation frequencies.
(a) Two-dimensional ΔT⁄T(λ,τ) map for a graphite sample prepared by liquid phase exfoliation. (b) ΔT⁄T spectra at selected probe delays; (c) Δ T⁄T dynamics at 1270-nm probe wavelength (red circles) together with a bi-exponential t (black solid line). Inset: zoom of the signal for negative delays.
Chemometric analysis of the acquired dataset. (a) SRS spectra for PMMA (solid black line) and PS (dotted red line). (b) False-color image of the sample, showing a central bead of PMMA (in red), surrounded by smaller beads of PS (in green). (c) and (d): concentrations maps of PMMA and PS.
Comparison with Monochromators
The GEMINI is designed to be added to your setup to extract the spectrum of any light source, coherent or not. It can replace monochromators, since it overcomes their main drawbacks in terms of low throughput, xed spectral resolution and limited spectral coverage
Excitation-Emission Maps (EEMs) of Single Molecules
Technical Specifications
VERSION
S
L
Spectral range [nm]
250 - 2300 (Standard)
250 - 3500 (Ultra-broadband)
500 - 4200 (On request)
Max. Delay τ [fs @ λ=600 nm]
-100 → 700
-100 → 2000
Delay τ Stability
< 1 attosecond
Dimensions [mm]
100 x 110 x 65
Weight [kg]
1