Patent ID: 6850547

Claim:
A nitride based semiconductor laser device comprising: a transparent substrate having conductive properties; a nitride based semiconductor layer formed on one surface of said transparent substrate and constituting a cavity having a front facet on a side of laser light emission and a rear facet on an opposite side from said front facet, said front facet emitting a larger amount of light than said rear facet; a first ohmic electrode of a first conduction type formed on the other surface of said transparent substrate; and a second ohmic electrode of a second conduction type formed on said nitride based semiconductor layer, wherein at least one of said first and second ohmic electrodes is formed in such an asymmetrical shape or arrangement that the front facet and the rear facet of said cavity of said nitride based semiconductor layer can be distinguished, and wherein one of said first and second ohmic electrodes can be observed through said transparent substrate and said nitride based semiconductor layer from the other side of said first and second ohmic electrodes.