The IQ4X laser diode module from Power Technology Inc. can enable an OEM to retrofit its distributed feedback or fiber-coupled laser diodes for fluorescence measurements, spectroscopy, interferometry or microscopy. It is compatible with most 14-pin butterfly and DIL packages. It has a PID temperature controller and can operate in constant current or automatic power control modes. These modules are available for wavelengths ranging from 760 to 1060 nm and output powers from 5 to 40 mW. They have an average 2 MHz spectral width and measure 1.5 in. in diameter and 7.2 in. in length.