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TRANSCRIPT
Frequency analysis of out-of-loop CEP noise over the 0.05 Hz – 500 kHz range.
Frequency (Hz)
0 100 102 104 106
Noise
Spe
ctra
l Den
sity (
rad/
Hz1/2
)
10-8
10-6
10-4
10-2
0
10
20
30
40
50In
tegr
ated
Pha
se N
oise
(mra
d)CEP4: Record Setting Performance
CEP-STABILIZED FEW-CYCLE OSCILLATORS
Rainbow™ CEP4
The Rainbow CEP4 Advantage
• Lowest CEP noise• Self-referenced feed-forward• Extremely broad spectrum• fCEO=0• Chosen phase slip• Ultrashort pulses• Compact footprint• Long-term stability
CEP4 is Spectra-Physics’ latest generation of Carrier Envelope Phase (CEP) stabilization techniques, continuing the Femtolasers tradition of CEP innovation and success established over the past decade by CEP1 - CEP3. CEP4’s outstanding quality opens new realms of CEP stabilization:
• Via a direct feed-forward approach, the CEP drift is corrected on-the-fly after the free-running, passively stable Rainbow ultrafast oscillator.
• Zero phase slip, i.e., a train of pulses with identical waveform, is now as easy to obtain as any other slip rate.
• Unprecedented performance and reliability, both short- and long-term, are ensured by the CEP4 stabilization operation (Lücking et al., Optics Letters, Vol. 37, p. 2076, (2012)).
The CEP4 approach is packaged in a compact and robust module available together with the Rainbow oscillator. The latter generates the shortest optical pulses commercially available with highest quality, stability, and reproducibility.
Performance
Significantly reduced CEP noise is achieved by CEP4 via a drastically increased correction loop bandwidth. CEP4 allows for an oscillator pulse train with zero offset frequency, unlike any feed-back technique. With zero CEP slip from one pulse to the next, all pulses can now have identical waveforms. For the first time CEP sensitive experiments can be performed directly with few-cycle ultrafast oscillators.
The substantial increase in CEP stability is based on a simplified and elegant solution rather than an increase in complexity. CEP stabilization is decoupled from the laser performance and is guaranteed without rigorous requirements towards laboratory environmental conditions.
Applications
• Attoscience• Ultrafast nano-optics• Harmonic generation• Amplifier and OPCPA seeding
Rainbow CEP4 Specifications1, 3
Rainbow CEP4 SEED Rainbow CEP4 PRO
Pulse Duration N/A <7 fs
Bandwidth @ -10 dB >300 nm
Output Power >100 mW >150 mW
Central Wavelength 800 nm ±20 nm
Repetition Rate2 75 MHz (nominal)
fCEO 0 Hz
CEP Stability <60 mrad rms (0.05 Hz–500 kHz) over 12 hours
Beat Signal SNR >30 dB
Femtolock 2 Optional
1030 nm Output Optional
1. Due to our continuous improvement program, specifications are subject to change without notice.2. Other repetition rates available upon request.3. The Rainbow CEP4 is a Class IV – High Power Laser, whose beam is, by definition, a safety and fire hazard. Take precautions to prevent exposure to direct and reflected beams. Diffuse as well as specular reflections can cause severe skin damage.
Time (hours)
0 2 4 6 8 10
Phas
e Erro
r (m
rad)
-750
-500
-250
0
250
500
750
50 mrad (rms) over 10 hours
Feed-forward CEP4: No Cycle Slips
Out-of-loop CEP error recorded over 10 hours.
A train of pulses with identical waveform is obtained without any compromise in noise performance or reliability.
Constant Waveform: fCEO=0
Oscillator Pulse Train, CEP4 Approach: fCEO=O
Sign
al
Rainbow™ CEP4
Rainbow CEP4 Dimensions
Output View Top View
13.7(348)
28.7(730)
11.6(295)
5.7(145)3.9
(100)
Dimensions in inch (mm)
SP-DS-20150602-43
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