pulseSelect

pulseSelect

Reducing the Repetition Rate of Mode-locked Lasers with a Pulse Picker


Suitable for fs and ps Mode-locked Lasers


Acousto-Optical Single Pulse Selector

pulseSelect is an acousto-optical 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. High repetition rates and high contrast rates are achieved by using acousto-optical elements.

The pulse repetition rate can be reduced by an adjustable internal frequency divider or by external triggering. Pulse picking with low division ratios down to fREP/2 are possible. pulseSelect 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 in use.

At a Glance

  • Reduction of the repetition rate of mode-locked lasers
  • fs or ps mode-locked laser (e.g. Ti:Sapphire)
  • Low dispersion design suitable for ultra-short pulses down to < 20 fs
  • Division ratio continuously variable between 2 … 260,000
  • Synchronized to laser seed with internal trigger
  • Single-shot up to 3 MHz with external TTL trigger
  • External trigger-gate mode

Alternative Product


Single Stage Pulse Picker with pulseSelect

The Single pulseSelect consists of an optical module and control electronics. A Bragg cell represents the most important part of the optics, which selects individual pulses from the laser beam due to the acousto-optical effect. Focusing mirror, collimator mirror and a beam stop for the zero-order beam complete the setup. The driver electronics supplies the modulated RF signal for the Bragg cell with a carrier frequency that corresponds to the multiple of the laser repetition rate.

Double Stage Pulse Picker

pulseSelect in a double configuration is available in two variants, Serial and Parallel. The Serial variant offers an improved contrast ratio of over 200,000:1. The Parallel version allows the simultaneous picking of pulses from two synchronized laser sources.

Double pulseSelect Serial: This version is designed to achieve for highest contrast ratio of over 200,000:1 for non-adjacent pulses (5000:1 for adjacent pulses) by placing two Bragg cells in sequence. Both are synchronized to one common clock (in serial configuration; i.e. one beam through two Bragg cells).

Double pulseSelect Parallel: This variant is designed for simultaneous picking of pulses from two synchronized laser sources. The system is equipped with two synchronized Bragg cells. Independent picking settings are possible for both Bragg cells.

Specifications


pulseSelect Specification
 
Wavelength Ranges
(Other ranges on request)
pulseSelect Broadband
500 … 1600 nm

pulseSelect Dualband
340 … 540 nm + 680 … 1080 nm
Max. Laser Input Power5 W (at 800 nm)
Input Frequency (fREP)
(to be specified with 0.5 MHz accuracy at the time of order)
72 … 81 MHz
Input PolarizationHorizontal (polarization rotator optional)
Output Repetition Rate
(based on fREP = 80 MHz)
Single-shot … 40 MHz;
External Trigger based: Single-shot … 3 MHz
Internal Trigger based: ~ 308 Hz … ~ 40 MHz
(only integer values of fREP are available)
Division Ratio (internal trigger)2 … 260,000
Contrast Ratio
(at 800 nm, fREP/20)
> 75 : 1 for adjacent pulses;
> 500 : 1 for non-adjacent pulses
Diffraction Efficiency*
(at 800 nm, fREP/20)
> 50%
pulseSelect Dual - Serial: High-contrast performance
Contrast Ratio
(at 800 nm, fREP/20)
> 5000 : 1 for adjacent pulses;
> 200,000 : 1 for non-adjacent pulses
Diffraction Efficiency*
(at 800 nm, fREP/20)
> 25%
pulseSelect Dual - Parallel: Simultaneous picking of pulses from two synchronized laser sources
Contrast Ratio
(at 800 nm, fREP/20)
> 75 : 1 for adjacent pulses;
> 500 : 1 for non-adjacent pulses
Diffraction Efficiency*
(at 800 nm, fREP/20)
> 50%
Options
Input Frequency (fREP)
(to be specified with 0.5 MHz accuracy at the time of order)
35 … 90 MHz
High Diffraction Efficiency> 60% (36% for pulseSelect Dual - Serial),
only available for max average input power of 0.5 W
Polarization RotatorChanging input polarization to horizontal
All values depend on a certain system configuration, e.g. laser spot diameter, or mirror coating
* Ratio of the diffracted pulse energy to the pulse energy incident into Bragg cell

Typical Data

Typical Diffraction Efficiency vs Wavelength
Typical Diffration Efficiency vs Division Ratio

Datasheets & Brochures


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