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High-power and UV Lasers

VisIR

High Power Picosecond Laser

  • NEW: any wavelength between 765 and 780 nm, 1064 nm, 1532 nm
  • Pulse width typically 70 ps (FWHM) or 0.5 ns (FWHM)
  • NEW: option to tune pulse duration from 0.15 to 0.5 ns for high powered versions
  • Average output power between > 400 mW and > 1.5 W (depending on wavelength)
  • 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 1064 nm or 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-HP „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 to generate either short pulses of 70 ps or extended pulses of 0.5 ns (FWHM). The extended pulse duration of 0.5 ns is ideal for e.g., STED microscopy as longer pulses or even continuous-wave excitation can expose the sample to an unnecessary amount of radiation, leading to increased photobleaching. By combining the VisIR with our programmable pulse generator PPG 512, the pulse duration can be configured to any length from 0.15 to 0.5 ns. This permits fine control of not only the pulse parameter but also the coherence length of the laser. This is of great help for diffusion measurements in medical application.

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-HP „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.

Fiber coupling

The VisIR can be optionally coupled into a variety of optical fibers (multi-mode, single mode, or polarization maintaining single mode) via different connector types. We recommend FC/APC connectors for most applications, since they prevent back reflections that can interfere with laser stability. For details see our solutions for fiber coupling.


Optical output
Available wavelengths 765 to 1560 nm
Spectral width << 1 nm
Polarization Extinction Ratio (PER) VisIr-765(-HP) > 1 : 1000 (> 30 dB)
VisIR-1064 > 1 : 60 (> 18 dB)
VisIR-1530(-HP) > 1 : 100 (> 20 dB)
Power Stability (12 hours) (ΔT (ambient) < 0.5 K) < 3 % rms
Other optical specs (power, pulse, beam shape) See tab Wavelengths
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 V and + 1 V
Connector BNC
Synchronization output
Amplitude < -800 mV into 50 Ohm (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 352 x 336 x 82.5 mm (l × w × h)
Weight 7.5 kg
Operation
Temperature range 10-30 °C
Maximum power consumption 115 W

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.

The following table summarizes the optical specifications for the respective models

Type Wavelength
[nm]
Pulse
(FWHM)
Max. avg. power
[W]
Divergence
[mrad]
Beam diameter
[mm]
Beam quality
VisIR-765 766 (± 1) Typ. 70 ps > 0.4 < 0.5 2.2 ± 0.2 M² < 1.1 (typ. ~ 1.02), TEM00
VisIR-765-HP „STED“ 766 (± 1) Typ. 0.5 ns1 > 1.5 < 0.5 2.2 ± 0.2 M² < 1.1 (typ. ~ 1.02), TEM00
VisIR-775 775 (± 1)2 Typ. 70 ps > 0.4 < 0.5 2.2 ± 0.2 M² < 1.1 (typ. ~ 1.02), TEM00
VisIR-775-HP 775 (± 1)2 Typ. 0.5 ns1 > 1.5 < 0.5 2.2 ± 0.2 M² < 1.1 (typ. ~ 1.02), TEM00
VisIR-1064 1064 (± 2) < 80 ps > 1 < 1.5 1.1 ± 0.1 M² < 1.3 TEM00
VisIR-1530 1531 (± 3) Typ. 70 ps > 0.75 < 1.5 2.2 ± 0.2 M² < 1.1 TEM00
VisIR-1530-HP 1531 (± 3) Typ. 0.5 ns1 > 1.3 < 1.5 2.2 ± 0.2 M² < 1.1 TEM00

1 tunable pulse duration from 0.15 to 0.5 ns can be achieved by using our Programmable Pulse Generator (PPG 512)
2 any other wavelength between 765 and 780 nm can be provided upon request (may result in longer delivery times)



Latest 10 publications referencing VisIR

The following list is an extract of 10 recent publications from our bibliography that either bear reference or are releated to this product in some way. Do you miss your publication? If yes, we will be happy to include it in our bibliography. Please send an e-mail to info@picoquant.com containing the appropriate citation. Thank you very much in advance for your kind co-operation.