GEMINI 2DINTERFEROMETER

for time-resolved measurements

GEMINI 2D

for time-resolved measurements

The GEMINI 2D is the advanced model of the GEMINI interferometer.
It is a compact and ultra-stable interferometer, capable of generating a pair ofcollinear and phase-locked replicas of ultra-short pulses,
with unrivaled stability and robustness.

The GEMINI 2D is specially designed to:• keep constant the dispersion introduced during the scan of the delay between the two replicas• keep fixed the absolute arrival time of one of the two replicas (with attosecond stability)• High throughput• 1 attosecond stability• Scan range selectable by the user
• Compact and insensitive to vibrations

Main Applications
The GEMINI 2D is the ideal device for time-resolved measurements,
where it is crucial to preserve the pulse duration and the synchronization with other light pulses.

Perfectly suitable for two-dimensional (2D) spectroscopy experiments,
to generate a pair of collinear and phase-locked pump pulsesTwo-dimensional Spectroscopy (in pump-probe geometry)
T2

T1Sample

BroadbandProbe

Spectrometer
(3)

PNR+R

3 + LOINIME2D21G

Delay T1 (fs)

Oscillating transient signal as a function of the relative
delay T1 between the two pump pulses at a selectedprobe wavelength and at a fixed population time T2.
A Fourier Transform as a function of T1 for each probe
wavelength allows one to retrieve the 2D maps as afunction of detection and excitation wavelengths.

dbandaBro pPum

Bidimensional maps of 2D Electronic Spectroscopy measurements obtained on a Light Harvesting (LH1) complex of asample of Rhodospirillum Rubrum for three different population times T2 (15 fs, 45 fs, 4000 fs).
15 fs

45 fs

4000 fs• The GEMINI 2D interferometer is placed in the pump beam before the sample, allowing one to generate twocollinear and phase-locked pump pulses (1 and 2) with a relative variable delay T1 (coherence time).

• The absolute arrival time of pulse 2 is kept fixed in order not to change the delay T2 (population time) during thescan of T1.
• In the pump-probe geometry, the rephasing and non-rephasing signals - PNR+R - are emitted in the same direction
as the probe (3), which also acts as a local oscillator (LO) that heterodynes them on the detector.

D. Brida et al., Opt. Lett. 37, 3027-3029 (2012).
J. Réhault et al., Rev. Sci. Instrum. 85, 123107 (2014).
R. Borrego-Varillas et al., Opt. Express 24, 28491-28499 (2016).

Performances
REPEATIBILITY TESTSTABILITY TEST

Relative Delay (arb.un.)
Interference patterns between the two replicas
generated by the GEMINI 2D Interferometer,
measured for different scan number indicatedon the right. The lower one is the average of 40
scans. The measurements show an exceptional
repeatibility!

(a) Fringe pattern generated by the interference of the two replicas
created by the GEMINI 2D Interferomter; (b) sequence of fringe patterns
acquired by keeping the relative delay fixed for 30 min; and (c)corresponding phase fluctuations. The phase jitter is less than 1 ∕ 360thof the optical cycle.

Technical Specifications
VERSION

Spectral Resolution

SL

400 - 2300 (Standard)

Spectral range [nm]250 - 3500 (Ultra-broadband)
Max. Delay τ [fs @ λ=600 nm]

SYM± 400± 1050

ASY-100 → 700-100 → 2000

Delay τ Stability< 1 a�osecondDimensions [mm]180 x 180 x 90

Weight [kg]2Specifications can be subject to change without notice.
For more information, please contact us via e-mail at info@nireos.com
or visit our website www.nireos.com

Relative to theASY version