Measurement of the spontaneous emission factor of a 3.39 μm HeNe laser
1994; Elsevier BV; Volume: 107; Issue: 3-4 Linguagem: Inglês
10.1016/0030-4018(94)90031-0
ISSN1873-0310
AutoresS. J. M. Kuppens, H. van Kampen, M. P. van Exter, J. P. Woerdman,
Tópico(s)Semiconductor Lasers and Optical Devices
ResumoThe spontaneous emission factor Nsp = N2(N2 − N1) of a 3.39 μm HeNe laser is determined from spontaneous emission light radiated from the side of the gain tube. Nsp is shown to depend linearly on the intra-cavity optical intensity. This linear power dependence of Nsp will give rise to a power-independent contribution to the quantum-limited spectral linewidth of the laser. We predict that at an output power of 190 μW this contribution will already make up half of the fundamental laser linewidth.
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