Enhanced modulation bandwidth of GaAlAs double heterostructure lasers in high magnetic fields: Dynamic response with quantum wire effects

Arakawa, Y.; Vahala, K.; Yariv, A.; Lau, K.
December 1985
Applied Physics Letters;12/1/1985, Vol. 47 Issue 11, p1142
Academic Journal
The modulation bandwidth of GaAlAs double heterostructure (DH) lasers in high magnetic fields is measured. We found that the modulation bandwidth is enhanced by 1.4× with a magnetic field of 20 T. This improvement is believed to result from the increase of the differential gain due to two-dimensional carrier confinement effects in the high magnetic field (quantum wire effects). A comparison of the experimental results with a theoretical analysis indicates that the intraband relaxation time τin of the measured DH laser in the range of 0.1 to 0.2 ps.


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