LDI-4 Laser Diode Illuminator
LDI-4
The LDI-4 laser diode illuminator was designed in direct response to researcher demand for a streamlined, 4-channel solution covering the most essential fluorescence probes: DAPI (405 nm), FITC/GFP (470 or 488 nm), TRITC/mCherry (555 or 577 nm) and Cy5 (640 nm). Built on the same robust platform as the LDI-7, it delivers up to 1000 mW per line with feedback-controlled optical stability, TTL and analog modulation, and zero user alignment — making it an ideal drop-in laser source for spinning disk confocal, widefield, TIRF and super-resolution setups.
You can also check out our new generation of LDI-4: LDI-G2-4 Laser Diode Illuminator
Key features
- 4 laser lines covering the most widely used fluorescence probes
- Up to 1000 mW output power per line
- Feedback-controlled optical stability
- Optional 488 nm & 577 nm lasers
- No user alignment required
- TTL & Analog control
References and product variations
Part number
Combined wavelengths (nm)
Options
Ask for a quote
Part number LDI-4
Part number LDI-4-577
Part number LDI-4-488
Part number LDI-4-488-577
Performance by Wavelength
Wavelength
Optical Power Min (1)
CW Stability (typ.) (2)
Max Rise Time (typ.) (3)
Max On/Off Frequency (4)
405
Optical Power Min (1) 300 mW
CW Stability (typ.) (2) < 2 %
Max Rise Time (typ.) (3) < 10 µs
Max On/Off Frequency (4) > 1000 Hz
470 or 488
Optical Power Min (1) 1000 mW
CW Stability (typ.) (2) < 2%
Max Rise Time (typ.) (3) < 10 µs
Max On/Off Frequency (4) > 1000 Hz
555 or 577
Optical Power Min (1) 1000 or 700 mW
CW Stability (typ.) (2) < 2%
Max Rise Time (typ.) (3) < 2 ms
Max On/Off Frequency (4) 100 Hz
640
Optical Power Min (1) 400 mW
CW Stability (typ.) (2) < 2%
Max Rise Time (typ.) (3) < 10 µs
Max On/Off Frequency (4) > 1000 Hz
(1) Optical power measured at 100% intensity, 23°C ± 2°C.
(2) Continuous Wave Stability: Standard Deviation relative to mean power, at 100% intensity, 23°C ± 2°C.
(3) Optical power measured at 100% intensity, 23°C ± 2°C.
(4) Measured at 100% intensity, 50% duty cycle
Optical characteristics
Output Power
Up to 1000 mW per line
Optical Stability
Feedback-controlled
< 2% CW stability
Intensity Control
1% steps
100:1 linear dynamic range
Laser Lines
Up to 7 lines : 405 / 445 / 470 or 488
520 / 555 or 577 / 640 / 730 nm
NIR Channel (730 nm)
✔ Deep-tissue imaging
Extended spectral range beyond visible
Beam Quality
Standard multimode output
Fiber Output
400 µm bifurcated
User Alignment
Not required
LDI-4 Laser Diode Illuminator General specifications
Output Options
Optical fiber
(400 µm bifurcated, 0.39 NA)
Control Options
TTL (> 2.3 V) | Analog (0–5 V)
USB–DSP (virtual COM port)
Safety
Interlocked housing | Key interlock
IEC 60825 compliant
QUAREP-LiMi WG1
--
Dimensions
318 × 234 × 146 mm
(12.5" × 9.2" × 5.75")
Weight
~ 4 kg (~9 lbs)
Operating Temp.
15 to 30 °C
Storage Temp.
-18 to 50 °C
Humidity
< 80% non-condensing
Voltage
90–220 V AC, 50–60 Hz
Warranty
2 years
Applications / Techniques
Spinning Disk Microscopy
Widefield Microscopy
Light Sheet Microscopy
Structured Illumination Microscopy (SIM)
Super Resolution Imaging
TIRF
PALM / STORM / DNA-PAINT
FRAP
Photoactivation / Photoconversion
Photoablation
Optogenetics
Neuroscience / Physiology
Cellular Biology
Single Molecule FISH (smFISH)
Spatial Transcriptomics / Proteomics
Digital Pathology
