An optical recording medium is provided with: a first substrate having first pits on one face thereof; a first reflective layer that is formed on the face bearing the first pits of the first substrate in a manner so as to reflect lands and recesses of the first pits; a second substrate that is formed on the first reflective layer, with second pits being formed on a face on the side opposite to the first reflective layer; a second reflective layer that is formed on the face bearing the second pits of the second substrate in a manner so as to reflect lands and recesses of the second pits; and a cover layer formed on the second reflective layer. In this structure, the first pit depth d.sub.1 that is a difference between lands and recesses of the first reflective layer, the wavelength .lamda. of signal-reproducing laser light and the refractive index n.sub.1 of the second substrate satisfy the following relational expressions: .lamda./(5n.sub.1).ltoreq.d.sub.1.ltoreq..lamda./(3n.sub.1) and d.sub.1.noteq..lamda./(4n.sub.1). Moreover, the second pit depth d.sub.2, which is a difference between lands and recesses of the second reflective layer, the wavelength .lamda. of signal-reproducing laser light and the refractive index n.sub.2 of the cover layer satisfy the following relational expressions: .lamda./(5n.sub.2).ltoreq.d.sub.2.ltoreq..lamda./(3n.sub.2) and d.sub.2.noteq..lamda./(4n.sub.2).

 
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> External cavity surface emitting laser device having a plurality of quantum wells

> Fiber-laser-based gigahertz sources through difference frequency generation (DFG) by nonlinear optical (NLO) materials

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