Phosphor structures
A light source includes a laser diode device and a wavelength conversion member. The wavelength conversion member includes a wavelength conversion element having voids and a dielectric element. The dielectric element fills the voids on a surface of the wavelength conversion element adjacent to the dielectric element. An output facet of the laser diode device is configured to output a laser beam of electromagnetic radiation. The laser beam is incident on a surface of the wavelength conversion member and a light is emitted from the wavelength conversion member. The light emission includes a mixture of wavelengths characterized by at least the second wavelength from the wavelength conversion member.
1 . A light source, comprising:
a laser diode device comprising a gallium and nitrogen containing material and configured as an excitation source;
a wavelength conversion member configured as an emitter and optically coupled to the laser diode device, the wavelength conversion member comprising a dielectric element, a wavelength conversion element having voids, at least some of the voids on a surface of the wavelength conversion element adjacent to the dielectric element, and a reflective element, wherein the dielectric element is disposed between the wavelength conversion element and the reflective element, a refractive index of the dielectric element is lower than a refractive index of the wavelength conversion member, and solidified material from the dielectric element fills the voids on the surface and provides an interface with the reflective element;
an output facet of the laser diode device configured to output a laser beam of electromagnetic radiation;
a free space with a non-guided characteristic capable of transmitting the laser beam from the laser diode device to the wavelength conversion member;
the wavelength conversion member configured to convert at least a fraction of the electromagnetic radiation in the laser beam with a first wavelength to a second wavelength that is longer than the first wavelength;
a reflective mode characterizing the wavelength conversion member such that the laser beam is incident on an excitation surface of the wavelength conversion member and the excitation surface is a primary emission surface of the wavelength conversion member; and
the wavelength conversion member configured to emit a light from the primary emission surface of the wavelength conversion member, the light emission comprised of a mixture of wavelengths characterized by at least the second wavelength from the wavelength conversion member.
2 . The light source of claim 1 , wherein the dielectric element of the wavelength conversion member is directly coupled to the wavelength conversion element and the reflective element.
3 . The light source of claim 1 , wherein the dielectric element of the wavelength conversion member comprises silicon oxide.
4 . The light source of claim 1 , further comprising a submount member coupled to the laser diode device to form a chip on submount structure, and a common support member configured to support the laser diode device and the wavelength conversion member.
5 . The light source of claim 1 , wherein the reflective element of the wavelength conversion member comprises at least one of silver or aluminum.
6 . The light source of claim 1 , wherein the laser diode device is configured to generate the laser beam of electromagnetic radiation having a violet or a blue emission with a first wavelength ranging from 400 nm to 485 nm, and the wavelength conversion member is configured to provide the second wavelength in a yellow wavelength range, and wherein the light emission is a white light comprised of the first wavelength and the second wavelength.
7 . The light source of claim 1 , wherein the wavelength conversion element is comprised of a ceramic yttrium aluminum garnet (YAG) doped with Ce or a single crystal YAG doped with Ce.
8 . The light source of claim 1 , wherein the dielectric element is a first dielectric element on a first surface of the wavelength conversion element, and wherein the wavelength conversion member also includes a second dielectric element on a second surface of the wavelength conversion element, the second dielectric element disposed between the wavelength conversion element and an anti-reflection coating, and the second dielectric element fills the voids on the second surface of the wavelength conversion element and provides an interface with the anti-reflection coating.
9 . The light source of claim 1 , wherein the voids are within a bulk of the wavelength conversion element and on at least two surfaces of the wavelength conversion element.
10 . The light source of claim 1 , wherein the light source is enclosed in a package; wherein the package is characterized by a sealing selected from an open environment sealing, an environmental sealing, or a hermetic sealing.
11 . The light source of claim 10 , wherein the package is selected from a can type, a flat package type, a surface mount type, a butterfly type, a C-mount type, or a Q-mount type.
12 . A light source, comprising:
a laser diode device comprising a gallium and nitrogen containing material, and configured as an excitation source;
a wavelength conversion member configured as an emitter and optically coupled to the laser diode device, the wavelength conversion member comprising a dielectric element, a wavelength conversion element having voids, at least some of the voids on a surface of the wavelength conversion element adjacent to the dielectric element, and a transmissive element, wherein the dielectric element is disposed between the wavelength conversion element and the transmissive element, a refractive index of the dielectric element is lower than a refractive index of the wavelength conversion member, and solidified material from the dielectric element fills the voids on the surface and provides an interface with the transmissive element;
an output facet of the laser diode device configured to output a laser beam of electromagnetic radiation, the electromagnetic radiation characterized by a wavelength range, a spectral width, a power, and a spatial configuration;
a free space with a non-guided characteristic capable of transmitting the laser beam from the laser diode device to the wavelength conversion member;
the wavelength conversion member configured to convert at least a fraction of the electromagnetic radiation in the laser beam with a first wavelength to a second wavelength that is longer than the first wavelength; and
a transmission mode characterizing the wavelength conversion member with the laser diode device arranged so that the laser beam is incident on a first surface of the wavelength conversion member, the wavelength conversion member configured to emit a light from a second surface that is opposite the first surface, the light emission comprising a mixture of wavelengths characterized by at least the second wavelength from the wavelength conversion member.
13 . The light source of claim 12 , wherein the dielectric element of the wavelength conversion member is directly coupled to a phosphor element of the wavelength conversion member and the transmissive element of the wavelength conversion member.
14 . The light source of claim 12 , wherein the dielectric element of the wavelength conversion member comprises silicon oxide.
15 . The light source of claim 12 , wherein the voids are within a bulk of the wavelength conversion element and on at least two surfaces of the wavelength conversion element.
16 . The light source of claim 12 , wherein the dielectric element is a first dielectric element on a first surface of the wavelength conversion element, and wherein the wavelength conversion member also includes a second dielectric element on a second surface of the wavelength conversion element, the second dielectric element disposed between the wavelength conversion element and an anti-reflection coating, and the second dielectric element fills the voids on the second surface of the wavelength conversion element and provides an interface with the anti-reflection coating.
17 . The light source of claim 12 , wherein the laser diode is configured to generate a first blue wavelength in a range of 425 to 480 nm, the second wavelength from the wavelength conversion member is in a yellow wavelength range, and wherein the light emission is comprised of the first wavelength and the second wavelength.
18 . The light source of claim 12 , wherein the light source is configured in a package selected from a can type, a flat package type, a surface mount type, a butterfly type, a C-mount type, or a Q-mount type.