BDS-SMY series picosecond diode lasers are optimised for operation at 532, 561, 594nm, operating at a fixed 50MHz rep rate. Becker & Hickl’s small industrial-size laser has all the pulse driver and control circuitry contained in the laser head. All that is needed to operate the lasers is a +12V power supply and a few control signals for setting repetition rate and optical power. Pulse width is in the range of 40ps to 80ps.
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All BDS-SMY lasers are tansversal single-mode lasers. That means, the emission virtually comes from a single spot inside the laser, as such the laser beam can be focused in a diffraction-limited spot or coupled into a single-mode fibre. The BDS-SMY lasers are available with free-beam output, with fixed (pig tail) fibres, with Lasos Precision fibre connectors, and with Point-Source-Type couplers.
Due to an internal power regulation loop, the BDS-SMY lasers feature extraodinarily stable optical power. Intensity drift by temperature changes and intensity noise by mode fluctuations in the laser diode are almost entirely suppressed. The lasers have a fast on/off function which can be used for beam blanking in scanning applications and for laser multiplexing.
The BDS-SMY lasers deliver a trigger output signal for synchronisation to bh TCSPC devices. The output amplitude is sufficient for distribution of the trigger signal to several TCSPC modules. The timing stability of the trigger pulses versus the optical pulses is better than 5 ps. Extended warm-up times are not needed. After switch-on of the power supply, the timing is stable within about 4 picoseconds.
The BDS-SMY lasers can be triggered externally. To keep the internal power regulation loop in the active range the trigger frequency should be in the range from 10 to 80MHz. The laser switches between the external trigger signal and the internal 20-50-80MHz clock by sensing the average voltage at the synchronisation input. If the average voltage is above 2.5V the laser uses the internal clock, if it is below 2.5V it synchronises to the external signal.
Optical Specifications
| Repetition Rate, switchable by TTL signal | 20 MHz and 50 MHz, other repetition rates on request |
| Wavelengths | 532 nm, 561 nm, 594 nm |
| Pulse width (FWHM, at medium power) | 40 to 80 ps |
| Power control range (power in free beam) | typicallly 0 to 0.5 mW |
| Beam diameter, free beam | 1 mm x 2 mm |
| Polarisation | horizontal |
| Coupling efficiency into single-mode fibre, typically | up to 50 % |
Fluorescence lifetime
FLIM
Phosphorescence lifetime
FLIM-FRET
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Photonic Solutions Ltd
Unit 2.2 Quantum Court
Heriot-Watt University Research Park
Edinburgh
EH14 4AP
