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This exploratory classroom study investigated the effects of two video‐assisted pronunciation interventions on the French pronunciation of 12 males and 7 females (n = 19) enrolled in a fourth‐year high school French class. Interventions occurred three times per week over a semester and required participants to repeat what they heard while watching subtitled, cultural videos in French—both during...
Several laser gain materials (such as Nd, Yb, Er, and Ho) exist which can be pumped with low quantum defect with diode pumps operating at wavelengths close to the laser transition1,2. The corresponding absorption features can be narrow, placing ever-tighter constraints on the spectral performance of the diode pump. This is because efficient laser systems requiring uniform absorption of the pump light...
The power conversion efficiency of cryogenically-cooled InP diode lasers is limited by excess electrical voltage caused by carrier freeze-out. A laser design which specifically mitigates this effect demonstrates peak efficiency of 73% at 77 K.
Nd:YAG systems are conventionally pumped at 808-nm. Direct upper-level pumping at 885-nm leads to lower heat. Diode laser pumps sources now provide power with efficiency close to 70% at both wavelengths, offering significant system benefits.
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