helixx femtosecond laser
The helixx is a unique turn-key femtosecond laser with a 250 MHz repetition rate, delivering >2.3 W of average power in pulses <50 fs. Tuneability is offered between 720 nm and 920 nm. Its innovative design combines a compact, hermetically sealed, vibration-resistant laser head that incorporates the Ti:Sapphire oscillator and pump laser, with a full-feature control unit. The control unit houses the field replaceable pump diodes, isolating temperature effects from the helixx laser head, and provides intelligent control that both monitors and maintains laser performance. The result is a highly stable and reproducible product with a long lifetime and low cost of ownership.
The helixx is particularly ideal for two photon microscopy. The repetition rate of 250 MHz significantly lessens photobleaching and phototoxicity, thus reducing damage to the cells and minimises the emission dead times of typical fluorophores. Its broad and continuous tuning range (see figure 1) improves flexibility in the choice of a suitable marker.
- Center Wavelength: 720 nm
- Repetition Rate: 249000 - 251000 kHz
- Pulse Energy: 0.009 mJ
- Energy Stability (RMS): 1 %
- Pulse Duration: 50 fs
- Pointing Stability (RMS): -- urad
- Polarization: Horizontal
- Spatial Mode (M^2): <1.3
- Amplification Scheme: Multi-Pass
- Wavelength Tunability: 720 - 920 nm
Scientific and industrial
Pulse train monitoring
An integrated high bandwidth (>10 GHz) photodiode can be used for repetition rate
monitoring and to supply a signal to the TL-1000 units or external electronics.
Repetition rate control
Control of the repetition rate and active feedback is enabled by cavity mirrors mounted on a fast and slow piezo crystal enabling rapid feedback and drift control simultaneously; this allows for the implementation of precision closed loop stabilisation of the repetition rate, as offered by Laser Quantum’s TL-1000 series
of stabilisation electronics.
Active locking of repetition rate and pulse timing
The TL-1000 is an optional supporting unit that enables tight phase-locking of the
repetition rate to an external reference with jitter <100 fs. TL-1000-ASOPS enables a repetition rate offset lock between two 250 MHz oscillators of 0.5 kHz to 5 kHz allowing ultrafast time-domain spectroscopy without a mechanical delay stage.
CEPLoQ™ is our patented technology that directly modulates the pump power to maintain phase stabilisation without the use of an AOM. This leads to faster and more stable responses than the traditional method.
The helixx is compatible with the Laser Quantum RemoteCom software that
allows connection to the Laser Quantum support team for monitoring laser
performance and diagnosing opportunities for carrying out laser optimisation.
Pump power modulation
Modulation access to the pump power with a bandwidth of >100 kHz and modulation depth up to ±1% is provided for feedback purposes.
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