BDL-SMN Series

ps Diode Laser
  • Pulse Width Down to 40 ps
  • Repetition Rate 20 MHz / 50 MHz / 80 MHz / CW (Switchable)
  • External Trigger via Synchronisation Input
  • Free Beam or Single-Mode Fiber Output
  • Optical Power Up to 50 mW
  • Fast ON / OFF / Multiplexing Capability
  • All Electronics Integrated
  • No External Driver Unit
  • Simple +12 V Supply
  • 160 x 90 x 60 mm3

The BDL-SMN devices are combined picosecond / CW diode lasers. All the pulse driver and control circuitry is 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. Compared to their BDL-SMC predecessors, the BDL-SMN feature higher power and full intensity regulation both in the pulsed and in the CW mode.

In OEM applications the laser head can be embedded as it is, with the the external system providing the control signals. For stand-alone applications the LSB-C laser switch box or the LSB-C2 dual-laser switch boxes are available, see photos below.

Due to an internal power regulation loop, the BDL-SMN 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 BDL-SMN 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 after less than a minute warm up time. The BDL-SMN lasers can also be triggered externally. However, the trigger frequency should be in the range from 10 to 80 MHz in order to keep the intensity-regulation loop in the active range.

All BDL-SMN lasers are tansversal single-mode lasers. That means, the emission virtually comes from a single spot inside the laser. Consequently, the laser beam can be focused in a diffraction-limited spot or coupled into a single-mode fibre. Focusing  and fibre injection is further improved by beam circularisation optics. The BDL-SMN lasers are available with fixed (pig tail) fibres, with Lasos Precision fibre connectors, and with Point-Source-Type couplers.

 

 

BDL-SMN

Optical

Wavelength / nm

375, 405, 445, 473, 488, 515, 640, 685, 785, Other on Request

Repetition Rate

20, 50, 80 MHz and CW Operation

Pulse Width (FWHM, at Medium Power, at Maximum Power) 2)

40 - 90 ps, 200 - 300 ps

Peak Power

40 to 500 mW

Diameter of Laser Beam

0.7 mm, TEM00 Mode

Polarisation

Horizontal

Coupling Efficiency into Single-Mode Fiber (typ.)

60%

Satbility of Repetition Rate

± 100 ppm

Pulse-to-Pulse Jitter

< 20 ps

Reaction Time to 'Laser On' Signal

3 µs

Power and Pulse Shape Stabilisation after Switch-ON

2 min 5)

Trigger Output

Pulse Amplitude

-1 V (Peak) into 50 Ω

Pulse Width

1 ns

Output Impedance

50 Ω

Connector

SMA

Delay from Trigger to Optical Pulse

< 1 ns

Jitter between Trigger and Optical Pulse

< 10 ps

Synchronisation Input

Amplitude

+3.3 V to +5 V into 50 Ω

Duty Cycle

10 to 30 %; DC Equivalent must be < 2.5 V

Frequency

20 to 80 MHz

Switching from Internal Clock to Sync Input

Automatic, by Average Voltage at Sync Input Connector

Control Inputs

Frequency (20, 50, 80 MHz) and CW Operation

TTL / CMOS high 3)

Laser ON / OFF

TTL / CMOS low 3)

External Power Control

Analog Input, 0 to +10 V

Power Supply

Power Supply Voltage

+9 V to +12 V

Power Supply Current

300 mA to 1.5 A 4)

Power Adapter

AC-DC Power Adapter, with Key Switch and Control Box in Cable

Mechanical Data

Dimensions (width x height x depth)

(160 x 90 x 60) mm

Mounting Thread

two M6 Holes

Maximum Values

Power Supply Voltage

0 V to +15 V

Voltage at Digital Control Inputs

-2 V to +7 V

Voltage at Ext. Bias Input

-12 V to +12 V

Ambient Temperature

15 °C to +35 °C

(1) Typical values, sample tested. Depends on pulse width and selected power
(2) Depends on wavelength version
(3) All inputs have 10 kΩ pull-up resistors. Open input is equivalent to logic 'high'.
(4) Depends on ambient temperature. Cooling current changes due to temperature regulation of laser diode. (5) Operation below 15 °C may result in extended warm-up time.

The bh TCSPC Handbook
8th edition, corrected and updated September 2019

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