| 摘要 |
PURPOSE:To obtain laser oscillation within a wide wavelength range without causing a mode-hop by using one cleavage plane of a semiconductor laser as one resonance mirror face and arranging a reflection means forming another movable resonance mirror face at the opposite side to the cleavage plane. CONSTITUTION:The cleavage plane 3 of the semiconductor laser 1 with a P-N junction 2 functions as one resonance mirror. Another crystal face 4 is coated to obtain a non-reflection face. The reflection means 5 rectangularly positioned such as an external mirror or a grating is arranged on the midway to the reciprocating course of beams. When driving currents I1 are flowed in the arrow (a), (b) direction, luminous wavelength is determined as lambda1 in response to I1. Consequently, a space L between the cleavage plane 3 and the external mirror 5 is adjusted and moved so as to be set to the integer times of lambda1. Accordingly, a mode-hop phenomenon is eliminated, and laser oscillation extending over the wide wavelength range can be conducted. |
