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Picosecond Pulsed Sources

VisIR

Versatile Picosecond Laser Module

  • Center emission wavelength 766 nm and 1532 nm
  • Pulse width typ. 70 ps (FWHM) or 0.5 ns (FWHM)
  • Average output power > 1.5 W or  > 400 mW
  • Repetition rates from single shot up to 80 MHz, external or internal triggering
  • Collimated output

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The VisIR laser is a versatile and flexible platform based on a Master Oscillator Fiber Amplifier (MOFA) concept with frequency conversion. The master oscillator generates infrared picosecond pulses at 1530 nm with variable repetition rates up to 80 MHz using the proven gain-switching techniques from PicoQuant. The output of this seed laser is directly connected to a multi-stage fiber amplifier, which boosts the output from the seed laser by several dB while maintaining the other characteristics of the seed laser beam like the emission wavelength, polarization and the pulse width.

Average output power > 1.5 W

The high pulse energies of the amplified 1530 nm infrared laser permit an efficient wavelength conversion using single pass second harmonic generation (SHG). In that way it is possible to generate picosecond pulses at 766 nm with an average output power of more than 1.5 W (VisIR-765 „STED“). The VisIR can be operated at 12 different internally selectable repetition rates between 31.25 kHz and 80 MHz and can also be triggered externally by TTL or NIM signals at any repetition rate between single shot and 80 MHz. This feature is extremely useful for a perfect synchronization of excitation and depletion laser in a stimulated emission depletion (STED) set-up.

Flexible pulse duration

The laser can be configured with a short pulse of 70 ps or an extended pulse duration of 0.5 ns (FWHM).
The extended pulse duration of 0.5 ns is found to be ideal for e.g. STED microscopy since longer pulses or even continuous-wave excitation can expose the sample to an unnecessary amount of radiation that can lead to increased photobleaching.

Excellent beam quality

Beam profile VisIR-765 The VisIR features a nearly perfectly circular and gaussian shaped beam profile (TEM00) which can be specified as a value of M² < 1.1, with a typical figure of about M² ~ 1.02. That is an important parameter for further accurate beam shaping (e.g. „STED-Donut“ for the VisIR-765 „STED“).

Compact stand alone device

The VisIR is a stand alone device with a special design optimized for maximum heat dissipation. It includes all driving functions of the established PDL series laser driver such as choice of repetition rate and trigger source. An optional remote control for the VisIR allows to set the trigger source, the repetition rate, and the general output power of the laser.


Model VisIR-765 VisIR-765 "STED" VisIR-1530 VisIR-1530-HP
Optical output
Center wavelength 766 ± 3 nm 766 ± 3 nm 1531 ± 3 nm 1531 ± 3 nm
Maximum average output power > 400 mW > 1.5 W > 750 mW > 1.3 W
Pulse width (FWHM) typ. 70 ps typ. 0.5 ns typ. 70 ps typ. 0.5 ns
Spectral width << 1 nm << 1 nm << 1 nm << 1 nm
Output collimated beam collimated beam collimated beam collimated beam
Beam diameter 2.2 mm ± 0.2 mm 2.2 ± 0.2 mm 0.5 ± 0.1 mm 0.5 ± 0.1 mm
Beam quality M² < 1.1 (Typ. ~ 1.02), TEM00 M² < 1.1 (Typ. ~ 1.02), TEM00 M² < 1.1, TEM00 M² < 1.1, TEM00
PER > 30 dB > 30 dB > 20 dB > 20 dB
Power stability (12 hours)
(ΔT (ambient) < 0.5 K)
< 3 % rms < 3 % rms < 3 % rms < 3 % rms
Repetition rates
Internal
Range user selectable:
80, 40, 20, 10, 5, or 2.5 MHz (80 MHz base frequency)
1000, 500, 250, 125, 62.5, or 31.25 kHz (1 MHz base frequency)
External via NIM input
Range < 10 Hz to 80 MHz
Trigger level fixed trigger level at -400 mV
Connector NIM-CAMAC
External via TTL input
Range < 10 Hz to 80 MHz
Amplitude - 5 to + 5 V (maximum limits)
Trigger level adjustable between -1 and +1 V
Connector BNC
Synchronization output
Amplitude < -800 mV into 50 Ohms (NIM)
Connector SMA
Delays
Trigger in (NIM) to sync out Typ. 9 ± 1 ns
Trigger in (NIM) to optical out Typ. 80 ns
Sync out to optical out Typ. 70 ns
Dimensions
Size (l × w × h) 352 x 336 x 82.5 mm
Weight 7.5 kg
Operation
Temperature range 10 - 30 °C
Maximum power consumption 115 W

* short pulse widths below 70 ps available on demand

laser sign class 4


All Information given here is reliable to our best knowledge. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external appearances are subject to change without notice.