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%.
Wavelength stabilization and spectrum narrowing of high-power multimode laser diodes and arrays by use of volume Bragg gratings.
Spectral line narrowing (by a factor of 8) and stabilization of the emission wavelength (by a factor of 30) of multimode high-power laser diodes and arrays is demonstrated by use of volume Bragg gratings fabricated in high-stability inorganic photorefractive glasses. Applications include stabilization of pump laser diodes and arrays for solid-state lasers and metal-vapor lasers, spin hyperpolarization of noble gases used in medical imaging, and others.
Operation of a single mode external-cavity laser diode array near 780 nm
We have narrowed the spectral bandwidth of a commercial 2 W laser diode array to be less than 120 MHz near 780 nm. The external-cavity laser diode array system is a standard double-pass Littman–Metcalf configuration operating on a dominant single longitudinal mode.