Abstract:
Volume holographic gratings are used to spectrally combine the emissions from multiple sources into a single output beam. Transmission of reflection gratings are utilized with either laser diode bars, fiber lasers, or fiber collimated light sources. The volume holographic spectral combiner can also be used to feedback and stabilize the wavelength of the sources in an external cavity configuration.
Abstract:
The present invention provides controlling the locked wavelength of individual diodes in an array such that the spectral output of the array when taken as whole is of the desired form for a given application. In one embodiment, a volume holographic grating is formed that has a wavelength that varies on the filter in accordance with the physical position of a laser emitter in a diode bar or stack. The system can be used in connection with a collimator disposed to received the output of a diode bar or stack of diode bars. The modified filter is then disposed adjacent the output of the collimator to provide a suitable shaped spectral output. This technique can be applied to stacks of laser diode bars, where each bar can be made to operate at any desired wavelength, or even individual emitters within the bar, such that the combined spectral output is designed for a particular application.
Abstract:
A laser utilizes feedback from a volume holographic grating integrated in a collimating lens as a wavelength standard to lock the laser output wavelength to its desired value. This feedback is optical, wherein a volume hologram reflection grating is used to generate optical feedback into the laser gain region. Fabrication of the integrated volume hologram grating lens elements is by either first recording the grating in a rectangular parallelepiped of material and then shaping the lens from it, or alternatively by first shaping the material into the desired shape and then recording the grating with the use of an apparatus composed of an optical block within which a cavity is present to accept the lens and index matching fluid.
Abstract:
The present invention provides controlling the locked wavelength of individual diodes in an array such that the spectral output of the array when taken as whole is of the desired form for a given application. In one embodiment, a volume holographic grating is formed that has a wavelength that varies on the filter in accordance with the physical position of a laser emitter in a diode bar or stack. The system can be used in connection with a collimator disposed to received the output of a diode bar or stack of diode bars. The modified filter is then disposed adjacent the output of the collimator to provide a suitable shaped spectral output. This technique can be applied to stacks of laser diode bars, where each bar can be made to operate at any desired wavelength, or even individual emitters within the bar, such that the combined spectral output is designed for a particular application.
Abstract:
Volume holographic gratings are used to spectrally combine the emissions from multiple sources into a single output beam. Transmission of reflection gratings are utilized with either laser diode bars, fiber lasers, or fiber collimated light sources. The volume holographic spectral combiner can also be used to feedback and stabilize the wavelength of the sources in an external cavity configuration.
Abstract:
A laser utilizes feedback from a volume holographic grating integrated in a collimating lens as a wavelength standard to lock the laser output wavelength to its desired value. This feedback is optical, wherein a volume hologram reflection grating is used to generate optical feedback into the laser gain region. Fabrication of the integrated volume hologram grating lens elements is by either first recording the grating in a rectangular parallelepiped of material and then shaping the lens from it, or alternatively by first shaping the material into the desired shape and then recording the grating with the use of an apparatus composed of an optical block within which a cavity is present to accept the lens and index matching fluid.
Abstract:
The present invention provides controlling the locked wavelength of individual diodes in an array such that the spectral output of the array when taken as whole is of the desired form for a given application. In one embodiment, a volume holographic grating is formed that has a wavelength that varies on the filter in accordance with the physical position of a laser emitter in a diode bar or stack. The system can be used in connection with a collimator disposed to received the output of a diode bar or stack of diode bars. The modified filter is then disposed adjacent the output of the collimator to provide a suitable shaped spectral output. This technique can be applied to stacks of laser diode bars, where each bar can be made to operate at any desired wavelength, or even individual emitters within the bar, such that the combined spectral output is designed for a particular application.