Optics / photonics equipment

Buying guide

The wavelength you work at settles most of what follows. An optic coated for 1064 nm is close to opaque at 532 nm, a silicon detector sees almost nothing in the mid-infrared, and a laser line that suits Raman is wrong for fluorescence. Fix the wavelength band first, then the specifications a buyer actually compares fall into place: the damage threshold a mirror has to survive, the responsivity curve of a detector across the band, the numerical aperture of a lens, the repeatability a translation stage returns to the same position. Reading those off a datasheet is straightforward. Confirming they hold on a used unit is the harder job.

On a used optical component, the coating is where condition lives. A scratch or a burn on a high-damage-threshold mirror is often invisible until the beam hits it, and a detector that has been over-illuminated reads low without looking damaged. Ask whether a photodiode or a camera still matches its original responsivity, whether a motorised stage has drive electronics and the right controller, and whether a light source has hours logged against a lamp or diode with a finite life. A laser head sold without its power supply and interlock is a different purchase from a working system, and the listing should make clear which one it is. Where a figure matters to you, point to the individual listing and arrange a warranty in consultation for that unit.

Price tracks that spread almost exactly. A used optical mount costs little more than a small part, while a complete laser bench runs into five figures, and the Questpair range from EUR 9 to EUR 231.579 holds both ends. What a given unit costs depends more on whether it is a bare component or an integrated instrument than on any single specification, so a budget set per item rather than per category tends to hold. Among the brands that recur here, Olympus, Thermo Scientific, Thermo Fisher Scientific, Nikon, Agilent appear most, which matters for a buyer because a named maker makes a model easier to look up and to compare against another listing. Refurbished and used optics listed for sale sit below new pricing, and with 96 percent of this catalogue second-hand, the affordable end is where most of the choice is.

Types of Optics / photonics equipment

Optical detectors

Optical detectors convert light into an electrical signal, and they are the most heavily listed subtype here. The category spans photodiodes and photomultiplier tubes, CCD and CMOS cameras, and complete detector modules, separated chiefly by the wavelength band they respond to, their sensitivity, and how fast they read. A silicon photodiode suits the visible and near-infrared, an InGaAs device reaches further into the infrared, and a cooled camera trades speed for the low-noise sensitivity that faint signals need. Detectors do the measuring in spectroscopy and in optical readout generally, and in the life sciences they sit at the heart of fluorescence microscopy and flow cytometry, where a photomultiplier counts the photons a labelled cell emits. The same sensors read out plate-based immunoassay and are built into cell imaging systems used across molecular biology, which is why a used scientific camera attracts buyers well beyond pure optics.

Optomechanical equipment

Optomechanical equipment is the mechanical hardware that holds, aligns and connects optical components: mounts, posts, rails, breadboards, cage systems, lens tubes and fibre couplers. What separates the items is less a specification than a format, the mounting standard, the thread, the degree of adjustment a kinematic mount offers, the stiffness a post or breadboard brings to a vibration-sensitive setup. This is the subtype a buyer reaches for when building or extending a bench rather than measuring anything, and it is where used purchasing makes the most sense, since a mount does not wear out the way a lamp or a detector does. Across life sciences laboratories the same hardware underpins any custom cell imaging or optical readout rig, so a researcher assembling an instrument for microscopy or electrophoresis documentation draws on exactly these parts.

Light sources

Light sources supply the illumination an optical measurement starts from, and they divide by spectrum and by stability. Broadband lamps, deuterium and tungsten-halogen sources, arc lamps, and laser-driven light sources each cover a different wavelength range and output level, and the choice turns on whether an application needs a smooth continuum or a bright, stable line. These systems illuminate spectrophotometers and microscopes, and in the life sciences a stable source is what makes a fluorescence or absorbance reading repeatable, so the subtype feeds directly into molecular diagnostics and protein quantitation work. A used lamp housing is common here, though a buyer weighs it against logged hours, since every lamp and diode source has a finite life.

Motion control equipment

Motion control equipment moves optical components with precision: translation and rotation stages, goniometers, actuators, and the controllers that drive them. The distinction between units is the axis count, the travel range, and above all the resolution and repeatability, how closely a stage returns to the same point run after run. A manual micrometer stage and a closed-loop piezo stage sit at opposite ends of that scale and serve different work. Automated stages position samples under a microscope objective and scan them, which is the mechanism behind high-content cell imaging and whole-slide histology, so this subtype carries real weight in biomanufacturing quality control and in genomics instrumentation where many samples are scanned in sequence. A buyer should confirm a stage arrives with its matching controller, as the two are often separable.

Laser systems

Laser systems are the coherent light sources of the category, and only a small number are listed. They range from diode and gas lasers to solid-state and fibre lasers, separated by wavelength, output power, and whether the beam is continuous-wave or pulsed. That last distinction decides the application: a continuous diode suits alignment and some spectroscopy, while a pulsed source drives time-resolved measurement. Lasers do the exciting in Raman and fluorescence spectroscopy and in confocal microscopy, placing them in cell imaging and molecular biology workflows, and they also serve gene editing readout where a specific excitation line is needed. A used laser warrants close attention to whether its power supply, cooling and interlock are included, since a bare head is not a working system.

Power meters

Power meters measure optical output, reading the power or energy a beam delivers so that a source or a laser can be characterised and set. Very few are listed. The meaningful differences are the sensor type, thermal, photodiode or pyroelectric, the wavelength range it is calibrated across, and the power span it can read without saturating. A buyer picks the sensor to match the beam, a thermal head for high average power, a photodiode head for low-level work. These instruments underpin any quantitative optical measurement, including the laser power checks that precede flow cytometry and imaging sessions, where a known excitation level keeps results comparable.

LED

LEDs are compact solid-state light sources, and a single listing represents them here. An LED differs from a lamp in its narrow, defined spectrum, its long life, and its ability to switch quickly, which is why LED illumination has spread through microscopy and plate readers. The relevant specifications are the emission wavelength or colour, the optical output, and whether the part is a bare emitter or a mounted, driveable module. Also used for fluorescence excitation and for general illumination in cell imaging, an LED source offers a stable, low-heat alternative to an arc lamp, which matters for live-cell work and for any measurement sensitive to thermal drift. With one unit listed, availability in this subtype is limited rather than typical of the catalogue.