- Reduction of the repetition rate of pulsed laser systems
- Designed for low dispersion, maintaining shortest pulse durations
- Suitable for fs and ps mode-locked laser systems
The pulseSelect is an acousto-optical single pulse selector developed for the special demands of femtosecond laser technology. Pulse distortion is minimized by a low dispersive design and the use of reflective optics. The use of an acousto-optical selection element allows for high repetition rates and high contrast ratio.
The pulse repetition rate can be reduced by using an adjustable internal frequency divider or by external triggering. With the pulseSelect low division ratios down to fREP/2 are possible. It has an integrated RF power limitation and protection circuit to prevent modulator damage. For highest stability the phase of the RF carrier frequency is locked to the repetition rate of the laser that it is used with.
Beside the standard version suited for fs or ps mode-locked Ti:Sapphire lasers, custom wavelength ranges in the VIS are available.
For improved contrast ratio of above 6000:1 APE offers the double stage version pulseSelect DUAL serial and for selecting pulses from two synchronized laser sources simultaneously the pulseSelect DUAL parallel.
|Wavelength ranges||500 … 1600 nm||680 … 1080 nm||680 .. 1080 and 340 .. 540 nm|
|Max. laser input power (PAV )||< 2 W (SiO2)1)||< 5 W (SiO2)1)||< 5 W (SiO2)1)|
|< 0.5 W (TeO2)1)|
|Diffraction efficiency||> 60% (TeO2)2)
> 50 % (SiO2)2)
|Contrast ratio||> 500 : 13)|
|Input frequency (fREP)||70 … 85 MHz (others on request)
25 … 100 MHz (Option)
(to be specified with 0.5 MHz accuracy at time of order)
|External trigger||single shot to 3 MHz input|
|Input polarization||horizontal (polarization rotator optional)|
|Division ratio||f/2 … f/260000 or externally triggered|
1) These values depend on the laser spot diameter in the crystal or mirror coating and thus apply only to a certain system configuration. Please consult our technical staff to determine the maximum input power level as well as the appropriate focusing for the beam parameters applicable for your laser system setup.
2) Ratio of the diffracted pulse energy to the pulse energy incident into Bragg cell. Measured with a fast photodiode at 800 nm and division ratio fREP/20.
At division ratio fREP/2 the efficiency is typically around 25 % (TeO2) and around 10 % (SiO2), respectively.
3) > 500:1 applies for non-adjacent pulses. Main pulse to adjacent pulse contrast ratio is > 75:1 (@ 800 nm fREP/20)
A selection of publications mentioning the use of the pulseSelect:
Louwers et al., Direct hole and delayed electron capture on a picosecond timescale by Eu21 centers in CaGa2S4 monitored by synchroscan with horizontal blanking,
Journal of Applied Physics, Vol. 111, Issue 9, 093709 (2012), Link (DOI) | Link