The QLD-301 is a direct-pulsed diode laser system featuring adjustable pulse width, low time jitter, high extinction ratio and high repetition frequency. The minimal pulse width is less than 50 ps but also can be adjusted to a large extent up to 1.5 ns duration for user-specific applications. With minimal short pulse, the repetition rate can go up to 1.25 GHz. Laser pulses can be triggered internally or externally with built in precision delay control. A sync output and a programmable clock output allow to trigger other components such as a TCSPC or testing electronics for single photon system.
With built-in EVOA and PD, the optical power and be adjusted easily and shown on the screen for quantum optical applications. Besides pulsed laser mode, continuous wave mode is also supported, of which average power can be set and monitored as well.
Product Highlights | Applications |
· Minimal pulse width ≤ 50 ps, FWHM | · Quantum optics, weak coherent pulse |
· Laser pulse jitter ≤ 20 ps, RMS | · Heralded single photon generation |
· Optical extinction ratio ≥ 40 dB | · Single photon detector testing system |
· High repetition frequency up to 1.25 GHz | · Fluorescence lifetime and fluorescence spectroscopy |
· Internal/external trigger selection with adjustable trigger delay | · Laser ranging system |
· Laser sync output and programmable clock output | · Time-resolved single molecule spectroscopy |
· Reference clock input and output | · Quantum optics, weak coherent pulse |
· 7” IPS touch screen and graphical user interface |
|
Optical Specifications
PARAMETER | MIN | TYP | MAX | UNIT |
Laser Output (FC/PC x1) |
Pulsed Laser Mode |
repetition frequency | single shot |
| 1250 | MHz |
minimal pulse width |
| 30 | 50 | Ps, FWHM |
adjustable pulse width [1] | 0.1 |
| 1.5 | ns |
pulse width resolution |
| 100 |
| ps |
time jitter |
| 15 | 20 | ps, RMS |
-3dB bandwidth |
| 0.06 | 0.1 | nm |
extinction ratio | 40 | 50 |
| dB |
maximum peak power [2] |
|
| 1.5 | mW |
CW Laser Mode |
average power adjustment range | -48 |
| -13 | dBm |
wavelength tuning resolution |
| 0.1 |
| Pm |
wavelength short term stability [3] |
|
| 10 | MHz, RMS |
Optical Attenuator and Power Monitor |
power monitor sensitivity |
| -75 |
| dBm |
internal attenuation | 0 |
| 35 | dB |
External Trigger Mode (pulsed laser mode only)
PARAMETER | MIN | TYP | MAX | UNIT |
Trigger Input (SMA x1) |
trigger frequency | single shot |
| 1250M | Hz |
trigger input voltage range | -5 |
| 5 | V |
trigger input duty cycle | 40 |
| 60 | % |
trigger input threshold | -2.5 |
| 2.5 | V |
trigger impedance, DC-coupled |
| 50 |
| Ω |
trigger delay range |
| 10 |
| ns |
trigger delay resolution |
| 10 |
| ps |
Sync Output (SMA x1) |
output voltage, ac coupled [4] |
| 400 |
| mVpp |
output impedance |
| 50 |
| Ω |
output duty cycle | 40 |
| 60 | % |
Internal Trigger Mode (pulsed laser mode only)
PARAMETER | MIN | TYP | MAX | UNIT |
Internal Trigger |
trigger frequency |
| 1,2,5,10,20,40,50,100, 200,500,1000,1250 |
| MHz |
trigger delay range |
| 1 |
| us |
trigger delay resolution |
| 10 |
| ps |
Sync Output (SMA x1) |
output voltage, ac coupled [4] |
| 400 |
| mVpp |
output impedance |
| 50 |
| Ω |
output duty cycle |
| 50 |
| % |
Programmable Dock Output (SMA x1) |
output voltage, ac coupled [4] |
| 400 |
| mVpp |
output impedance |
| 50 |
| Ω |
output duty cycle |
| 50 |
| % |
output frequency | 1 |
| 1250 | MHz |
Reference clock input (SMA x1) |
input voltage range | -5 |
| 5 | V |
input duty cycle | 40 |
| 60 | % |
input threshold | -2.5 |
| 2.5 | V |
input impedance, DC-coupled |
| 50 |
| Ω |
input clock frequency |
| 100 |
| MHz |
Reference clock output (SMA x1) |
output voltage, ac coupled [4] |
| 1500 |
| mVpp |
output clock frequency |
| 100 |
| MHz |
Note:
[1] The maximum adjustable pulse width is limited to 1ns when repetition frequency is more than 200MHz, and the pulse width is fixed to the minimal (<50ps) when frequency is more than 400MHz.
[2] Maximum peak power may be reduced by adjusting the internal attenuator.
[3] Wavelength short term stability condition: 25℃ after 20 min warm up, 1000 sec.
[4] Output voltage is specified with 50-ohm termination.
Hardware Specifications
PARAMETER | MIN | TYP | MAX | UNIT |
Operating temperature | 10 |
| 40 | ℃ |
Power Supply | 100-240VAC 50/60Hz |
|
Power Consumption |
|
| 65 | W |
Dimensions (WxDxH) | 300 x 388.6 x 146.3 | mm |
Net Weight | 7.5 | kg |
Typical Measurements
Minimal Pulse Width, 1.25GHz repetition rate 1ns pulse width, 200MHz repetition rate
Dimensions (unit: mm)
