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Photonic Products is a distributor of a single longitudinal mode semiconductor laser diode from Opnext. The HL7001MG/HL7002MG, with a built-in monitor photodiode, is designed for use in biomedical applications. The lasing wavelength of 705nm at 50mW offers high permeability for living tissue and low absorption of haemoglobin and water. The laser diode has optical output power of 50mW CW at 705nm, low operating current of 75mA, low operating voltage of 2.5V, LD reverse voltage of 2V, PD reverse voltage of 30V, a low threshold current of 30mA and monitoring output current of 0.15mA. The package measures 5.6mm and the operating temperature range is -10 to +60°C.