Laser Diode Chips

A laser diode chip is the active semiconductor component of a laser diode without a housing (bare die). Within the appropriate operating range, it generates laser light through electrical excitation. Only after integration—including assembly, bonding, heat dissipation, and, if necessary, optics or a housing—does it become a laser source suitable for specific applications.

The laser chip is the bare component. In chip-on-carrier or chip-on-submount configurations, it is already mounted on a carrier. A laser module integrates additional functions, such as beam shaping, fiber coupling, temperature control, or drive circuitry. The specific functions included depend on the particular product.

The available wavelength depends on the specific chip variant. Please let us know your desired wavelength and the acceptable tolerance. We will review suitable laser diode chips as well as options for custom variants. We will determine the specific specifications and availability on a project-by-project basis.

Power output depends on the part number, operating mode, operating current, and thermal conditions. The value listed in the data sheet under the specified test conditions is decisive. Continuous-wave (CW) power and pulse peak power are not interchangeable; chip output power and usable power after optical or fiber coupling may also differ from one another.

Single-mode operation refers to a single transverse mode and is important for good focusability. Multimode chips can enable higher power, but require appropriate beam shaping and coupling. Single-mode does not mean single-frequency: For a narrowband source, the longitudinal modes and linewidth must also be taken into account.

Only within the conditions approved for the specific chip. A CW specification does not allow for an arbitrary increase in pulse current. Pulse duration, peak current, duty cycle, and thermal load must be aligned with the manufacturer’s specifications.

The assembly must make reliable contact with the chip and dissipate the heat generated. The heat sink temperature and the active chip temperature are not the same. The permissible temperatures, the thermal path, ESD protection, and the handling of exposed facets are therefore part of the integration planning. The manufacturer’s assembly and operating instructions are authoritative.

No. Wavelength alone does not guarantee eye safety. The accessible radiation, power, pulse parameters, beam geometry, and exposure conditions of the entire system must be evaluated. Laser safety and classification must be assessed in accordance with the applicable regulations and standards, in particular IEC or EN 60825-1.

No. FMCW LiDAR requires a suitable coherent source. A suitable linewidth and a precisely tunable optical frequency are crucial. For silicon photonics, the mode field, coupling, back reflections, assembly, and thermal interfaces are also important. Laser chips, gain chips, and semiconductor amplifiers (SOA/RSOA) perform different functions and are not universally interchangeable.

Please specify the application, wavelength, and tolerance; optical power; operating mode; temperature range; desired integration; and quantity. For pulsed lasers, pulse duration, repetition rate, and duty cycle are important. For procurement, the project schedule, annual demand, and requirements regarding test reports, traceability, and change management are also helpful.