High-brightness wavelength-beam-combined diode laser stacks using a volume Bragg grating (VBG)
Using VBG-stabilized wavelength beam combining of 3-bar diode laser stack, we demonstrate 89.5 W CW with beam quality M2 ~ 26 in the slow-axis and M2~21 in the fast-axis. The beam combining efficiency is 75%.
Near-diffraction-limited diode laser arrays by wavelength beam combining.
We demonstrate 35 W output peak power with M2 approximately 1.35 in both dimensions from a 100 element, 100 microm pitch slab-coupled optical waveguide laser diode array using wavelength beam combining.
Identification of giftedness in severely and profoundly hearing impaired students
Nonverbal measures of IQ, teacher nominations and parent nominations were used to identify giftedness among severely and profoundly hearing‐impaired students enrolled in a school for the deaf or a public school system. It was found that while teachers and parents tended to nominate the same students, both groups of nominators missed some intellectually gifted students. On the whole, no statistical correlation was found among the three identification procedures. Hearing‐impaired children were judged to exhibit characteristics of giftedness very similar to those of their hearing peers, with the exception of academic achievement.