Spectra Physics J40 Laser Diode Heatsink, TEC, Blower Motor Assembly. This assembly is used in a Spectra Physics J40 laser power supply. It includes the heat sink+TEC for 1 FCBar pump laser diode modules along with a high power air blower. All electrical connections are intact for an easy drop-in replacement. We are a small company located in the heart of Silicon Valley. We specialize in surplus lasers and photonics and have an optics lab with many instruments such as power meters, laser diode drivers and optical spectrum analyzers. Combined with our considerable expertise, this allows us to test most of the items we sell so you can be confident that they will arrive in good working condition. Before placing your order. We take pride in our careful packing of delicate items. We do guarantee that the items we sell will be delivered in the condition described in the listing. Please read the listing carefully, do your research and ask us any questions you need to decide if the item is suitable for your use. Starlight Photonics PO Box 1134 Alviso, CA 95002.