Suitable for fs and ps Mode-locked Lasers
Acousto-Optical Single Pulse Selector
pulseSelect is an acousto-optical single pulse selector, or pulse picker, 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.
At a Glance
- Reduction of the repetition rate of mode-locked lasers
- fs or ps mode-locked laser (e.g. Ti:Sapphire)
- Low dispersion
- Custom VIS wavelength ranges
- Division ratio down to fREP/2
Double Stage Pulse Picker with pulseSelect DUAL
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.
pulseSelect Dual is a pulse selector – or pulse picker – using two acousto-optical Bragg cells and is avaialable in two variants:
pulseSelect Dual (serial)
This version is designed to allow for highest contrast ratio of above 6000:1 by placing two Bragg cells, both synchronized to one common clock, in serial configuration (i.e. one beam through two Bragg cells).
pulseSelect Dual (parallel)
This version is designed for selecting pulses from two synchronized laser sources simultaneously by placing two Bragg cells, both synchronized to one common clock with one common division ratio but independent delay settings, in parallel configuration (i.e. two separate beams each through one Bragg cell).
Specifications
| pulseSelect Specification | ||||
|---|---|---|---|---|
| Standard | HP-Ti:Sa | HP-Ti:Sa Dualband | ||
| Wavelength ranges | 500 ... 1600 nm | 680 ... 1080 nm | 340 ... 540 nm and 680 ... 1080 nm | |
| Other ranges on request | Other ranges on request | Other ranges on request | ||
| Max. laser input power (PAV ) | < 2 W (SiO2)* | < 5 W (SiO2)* | < 5 W (SiO2)* | |
| Diffraction Efficiency | > 60% (TeO2)** | |||
| > 50 % (SiO2)** | ||||
| Contrast Ratio | > 500 : 1*** | |||
| Input Frequency (fREP) (to be specified with 0.5 MHz accuracy at time of order) | 72 ... 81 MHz | |||
| Extended Input Frequency (only optionally) | 35 ... 90 MHz | |||
| External Trigger | Single-shot up to 3 MHz input | |||
| Input Polarization | Horizontal (polarization rotator optional) | |||
| Division Ratio | fREP/2 ... fREP/260,000 or externally triggered | |||
* 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.
** 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.
*** > 500:1 applies for non-adjacent pulses. Main pulse to adjacent pulse contrast ratio is > 75:1 (@ 800 nm fREP/20)
| pulseSelect DUAL Specification | ||||
|---|---|---|---|---|
| Standard | HP-Ti:Sa | HP-Ti:Sa Dualband | ||
| Wavelength | 500 ... 1600 nm | 680 ... 1080 nm | 340 ... 540 nm and 680 ... 1080 nm | |
| Max. Input Power (PAV) | < 2 W (SiO2)* | < 5 W (SiO2)* | < 5 W (SiO2)* | |
| Input Frequency (to be specified with 0.5 MHz accuracy at time of order) | 72 ... 81 MHz | |||
| Extended Input Frequency (only optionally) | 35 ... 90 MHz | |||
| External Trigger | Single shot up to 3 MHz input | |||
| Input Polarization | Horizontal (polarization rotator optional) | |||
| Division Ratio | fREP/2 ... fREP/260,000 | |||
pulseSelect Dual (serial): | pulseSelect Dual (parallel): | |||
| Diffraction Efficiency | approx. 25 % (SiO2)** | > 50 % (SiO2)**/*** | ||
| approx. 36 % (TeO2)** | > 60 % (TeO2)**/*** | |||
| Contrast Ratio | > 6000:1**** | > 500:1***** |
* These values depend on the laser spot diameter in the crystal or mirror coating and for the type of Bragg cell indicated and thus apply only for a certain system configuration. Please consult our technical staff to determine the maximum input power level as well as the appropriate focussing for the beam parameters applicable for your laser system setup.
** Ratio of the diffracted pulse energy to the pulse energy incident into Bragg cell. Measured at 800 nm and division ratio fREP/20.
*** At division ratio fREP/2 the efficiency is typically around 25 % (TeO2 Bragg cell) and around 10 % (SiO2 Bragg cell), respectively.
**** Main pulse to adjacent pulse contrast ratio is > 6000:1 (@ 800 nm fREP/20)
***** > 500:1 applies for non-adjacent pulses. Main pulse to adjacent pulse contrast ratio is > 75:1 (@ 800 nm fREP/20)
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