The system produces a pair of modelocked femtosecond lasers (optical frequency combs) with a slightly different pulse repetition rate. In the time domain, the optical delay is rapidly swept through a range of 16.6 nanoseconds at high speeds. In the frequency domain, beat notes between each pair of optical comb lines are generated via heterodyne detection. Through a novel shared-cavity architecture, our system is able to achieve ultra-low noise simply in free-running operation.
Dual comb specifications
SHG option
THG option
Available outputs
Controls
Physical dimensions
Requirements
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Features
Low-repetition rate single-cavity dual-comb laser
- Two spatially separated pulse trains with >1.5 W per beam
- <250 fs pulse duration
- Sub-cycle relative timing jitter
- Ultra-low relative intensity noise
- Fundamental Gaussian beam mode output
- Tunable and long-term stable repetition rate difference
- Very compact system design
- 24/7 turn-key operation
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Technical Specifications
Laser specifications
| Power per comb | >1.5 W |
| Pulse duration | <250 fs, clean sech² pulses |
| Repetition rate | 60 MHz |
| Pulse energy | >25 nJ |
| Center wavelength | 1050±10 nm |
| Beam quality factor M2 | <1.1 |
| Individual comb RIN | <-160 dBc/Hz for frequencies from 200 kHz |
Dual comb specifications
| Repetition rate difference | tunable between 100 Hz – 1000 Hz |
| Relative timing noise | sub-10 fs [100 Hz, 100 kHz] |
SHG option
| Center wavelength | 525±5 nm |
| Power per comb | >500 mW |
THG option
| Center wavelength | 350±3 nm |
| Power per comb | >80 mW |
Available outputs
| Optical | Two spatially separated pulse trains |
| Cross-correlation signal | Trigger signal at the repetition rate difference |
Controls
| Repetition rate difference | Digital (analog on request) |
| Repetition rate | Fixed |
| Power | Power allocation between fundamental and SHG (SHG option only) |
Physical dimensions
| Laser head (L x W x H) | 540 x 321 x 179 mm3 (Hybrid version) |
| Beam output height | 75 mm on (W) side |
| K2-Link Control Unit (L x W x H) | 395 x 436 x 88.05 mm3 (2U 19″ rack unit) |
| Cabling | 3 m between control box and laser head |
Requirements
| Operating temperature | 15 – 30 ºC (Water or Hybrid versions) |
| Relative humidity | <70% (non-condensing) |
| Electrical requirements | 100-120 VAC, 3 A, 50-60 Hz / 200-240 VAC, 1.5 A, 50-60 Hz |
| Rated power | 300 W |
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Options
- Integrated second harmonic
- Integrated third harmonic
- Passive (air) or active (water) cooling
- Optical Isolation
- Other repetition rates
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Applications
- Pump-probe sampling
- Thin film inspection
- Precision ranging
- Nonlinear microscopy
- Gas sensing and process control
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Example Characterization
Laser pulse spectrum
Relative intensity noise measurement
Relative intensity noise measurement
