Check the listing for details. CircuLaser 635nm, 20mW, 9mm diameter TO-5 Blue Sky Research Laser Diode PS022. Condition: New. Listed at 95.00 USD. Blue Sky Research 20mW, 635nm Laser Diode New, old stock laser diodes Part number PS022. The CircuLaser diodes have an integrated beam correcting lens that eliminates most of the astigmatism that is inherent in diode lasers. It also has a built in photo diode for monitoring the laser output for use in automatic power control (APC) circuits. The common case pin is laser diode anode and photo diode cathode. These are new diodes, individually characterized in factory envelopes. Specifications: Output Power: 20.0mW maximum.Wavelength: 635nm RED Operating Voltage: 2.3 Volts typicalThreshold Current: 45mA typicalOperating Current: 70mA typicalMonitor Current: 40uA typical.Operating Temperature: -10 to 50 deg.CPackage: TO-5, 9mm diameter base Note: Due to the sensitive nature of laser diodes, there is no warranty or exchanges on these items. See our other listings for similar items