LDH Series

Application & Methods LDH Series Picosecond Laser Diode Heads AVAILABLE WAVELENGTHS SPECIFICATIONS TECHNICAL DOWNLOADS KEY BENEFITS Wavelengths Specifications Optics focus length f’ = 4.5 mm (typ. for LDH-P/D-C-xxx) f’ = 9.0 mm (typ. for LDH-D-TA-xxx) Numerical aperture 0.55 Typical divergence with optics typ. Theta ǁ 0.11 mrad, typ. Theta ┴ 0.32 mrad Polarization typ. linear, perpendicular to the longer axis of the elliptical beam* PER typ. > 1:10 (> 10 dB) Sidemode suppression ratio (SMSR) typ. < 0.01 Peltier cooling stability better than 1 K for ambient temperature between 15 °C and 30 °C Wavelength < 900 nm approx. 2-8 nm Wavelength > 900 nm approx. 10-20 nm CW operation < 1 nm 12 hours, DT (ambient) < 3 K 1 % RMS, 3 % peak to peak Cooled (ø × length) 62 × 100 mm, with fiber coupling: 62 × 132 mm Flat type (l × w × h) 195 × 112 × 24 mm Cooled D-TA-type (ø × length) 68 × 148 mm „F-type“ with FC/APC connector (l × w × h) 200 × 100 × 35 mm Download the datasheet. * A few exceptions to this behavior might occur ** Narrower bandwidth might be available on request 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. Stable Picosecond Pulses for High-Precision Optical Measurements Broad Portfolio of Picosecond Diode Laser Heads The LDH Series offers a broad portfolio of picosecond pulsed diode laser heads spanning wavelengths from the UV to the NIR. Each diode laser head combines carefully matched drive electronics and optics to deliver clean, stable picosecond pulses with adjustable repetition rates up to 80 MHz. Multiple diode types, tapered-amplified, options, and single-mode or multimode fiber coupling provide wide flexibility across time-resolved techniques like FLIM, FCS, TRPL, as well as LiDAR. Compatible Laser Driver with LDH The LDH Series is fully compatible with the PDL 800-D, Sepia PDL 810, and Sepia PDL 828 drivers. This ensures reliable operation across different pulse modes, repetition rates, and wavelength configurations, enabling straightforward integration into both single- and multi-wavelength experimental setups. Suitable for All Major Scientific Disciplines The LDH Series is widely used across life sciences, materials research, quantum optics, and advanced sensing. Its clean picosecond pulses, broad wavelength coverage, and flexible driver compatibility support precise excitation in fluorescence studies, single-photon experiments, and ranging applications. This versatility makes the LDH platform a reliable choice wherever controlled laser excitation is essential. Single Mode and Multi Mode Fiber Integration LDH laser heads can be equipped with optional fiber coupling into single mode, polarization-maintaining single-mode or multi-mode fibers. Typical efficiencies reach above 40 % for single mode and above 80 % for multi-mode. Each configuration is prealigned before shipment to ensure stable output and reliable beam delivery for fiber-based setups. Laser Combining Unit for up to 5 Laser Lines For multi-color excitation, several LDH laser heads can also be combined into a single polarization-maintaining fiber using PicoQuant’s Laser Combining Unit (LCU), enabling compact and flexible multi-wavelength excitation configurations. Wavelength 375 nm to 900 nm Up to 5 laser lines Polarisation maintaining singlemode output fiber Flexible configurations Pulsed, Burst, and CW Modes Latest Blog Articles Fast Volumetric FLIM Beyond Confocal Limits