Tetrahedral diamond-like carbon films (ta-C) were deposited by femtosecond pulsed laser deposition (PLD) on various substrates, including 316L stainless steel and ultra high molecular weight polyethylene, in perspective to extend the wear resistance of materials used in hip joints. Usually films are deposited by plasma enhanced chemical vapor deposition or by PLD, principally performed with laser pulse duration in the nanosecond range. In the present study, DLC films were deposited by femtosecond laser ablation in high vacuum conditions at room temperature. The 800 nm, 150 fs laser pulses are generated by a mode-locked Ti:Sapphire laser, including an amplification stage. The fluence ranges from 1 to 6 J/cm. Sputter cleaning of the substrates in an argon atmosphere prior carbon deposition was widely investigated; the adhesion of the films onto the stainless steel substrates was then considerably enhanced by removing the contamination and oxidized top-coats. The adhesion properties of films deposited in various conditions on 316L stainless steel substrates were studied by tensile tests. The films exhibit high wear resistance with moderate hardness (in the 20-30 GPa range), which may be favorable for the accommodation motion between contacting surfaces in a hip joint.
Related Products
1. Femtosecond Ti:Sapphire lasers
2. High Vacuum Systems for Laser Deposition
Femtosecond Ti:Sapphire oscillators and amplifiers from Del Mar Photonics
Del Mar Photonics is please to announce several new Ti:Sapphire oscillator and amplifier products. Now Del Mar Photonics' customers can choose one of the following oscillator and amplifier options:
Femtosecond Ti:Sapphire Oscillator
1. If you already have a CW pump laser or plan to buy specific model and need only Ti:Sapphire oscillator we can offer our stand alone Ti:Sapphire lasers Trestles, that do not include pump laser and can be customized for any suitable CW pump.
Please indicate required pulse duration (standard models have 20 fs, 50 fs and 100 fs pulses) and tuning range. Let us know what kind of pump laser you have (make/model) so we can confirm what output parameters can be achieved.
2. If you do not have a pump laser and want to buy complete system we can
offer you one of the following:
One-box system Trestles Finesse that
include Trestles mini Ti:Sapphire oscillator and built in
DPSS pump laser
When choosing specific Trestles Finesse model please indicate required CW pump power (4W or 6W), Ti:Sapphire pulse duration and required tuning range (or tuning range, where you want to achieve maximum performance)
Tuning range can be customized at the factory by choosing one of standard or custom made optics set. Typical tuning curves for 4W CW pump laser for two standard optics sets are shown in the Trestles Finesse brochure. For example, with 4W CW pump laser and long-wave mirrors set tuning range can be extended up to 940nm. With 6W CW pump laser tuning range can be extended up to 980nm.
Femtosecond Ti:Sapphire Amplifier
1. We offer integrated oscillator/amplifier system
Teahupoo Rider. Teahupoo Rider is a fully-integrated all-in-one-box system
that includes Trestles Finesse oscillator
or Buccaneer SHG diode-pumped fiber oscillator,
pulse stretcher, regenerative amplifier pumped by
multi kHz Nd:YAG pump laser and pulse compressor. Teahupoo Rider has a
factory preinstalled repetition rate of 2, 5 or 10kHz and ideal for low cost
femtosecond micromachining systems, OPA pumping, ultrafast spectroscopy and
variety of applications in life sciences.
2. If you already have a Ti:Sapphire oscillator, we can offer you stand alone Ti:Sapphire amplifier. Two standard models are available: Wedge M multipass or Wedge R regenerative.
Each amplifier is customized to the customer's amplifier pump laser.
2. Custom Teahupoo Rider systems with a pump
laser of your choice are also available. Depending on the required
specifications we can recommend a pump laser and make required adjustments for
optimum performance.
The following specifications can be achieved:
Repetition rate: single pulses, 10 Hz up to 10kHz
Pulse duration: 100fs, 50fs, 30fs, <30fs
Pulse energy: from 100 mJ per pulse to few mJ per
pulse
Tunability: both fixed wavelength and tunable options are available - please
indicate required tuning range.