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A Measurement of Modal Gain Profile and Its Effect on the Lasing Performance in Vertical-External-Cavity Surface-Emitting Lasers

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11 Author(s)
Jun-Youn Kim ; Photonics Project Team in Display Device & Material Lab., Samsung Adv. Inst. of Technol., Suwon ; Cho, Soohaeng ; Lee, Junho ; Kim, Gi Bum
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We investigate the effect of relative wavelength difference between material gain and resonance peaks on lasing performance in vertical-external-cavity surface-emitting lasers (VECSELs). We propose a measurement method of the wavelength-dependent modal gain profiles by inserting a birefringent filter inside a cavity in order to modulate the optical loss according to the wavelength. With knowledge of the detailed gain profiles, we achieve a stable green output power of 3.3 W and a power conversion efficiency (= green output power/pump input power) of 17% in VECSEL with a LiB3O5 crystal as an intracavity frequency doubler

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 23 )