Multiple reflectivity band reflector
First Claim
1. A multiple reflectivity band reflector, comprising a plurality of layers of material arranged in parallel such that the reflector has:
- a first wavelength band with reflectivity above a threshold reflectivity, wherein the threshold reflectivity is at least 99%;
a second wavelength band with reflectivity above the threshold reflectivity; and
a third wavelength band including wavelengths between the first and second wavelength bands having reflectivity below the threshold reflectivity.
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Accused Products
Abstract
A multiple reflectivity band reflector (MRBR) includes a stack of dielectric layers, arranged so that the reflector has a reflectivity profile comprising a plurality of reflectivity bands, e.g. at least first and second wavelength bands with reflectivity above a lasing threshold reflectivity, separated by a third wavelength band between the first and second wavelength bands having reflectivity below the lasing threshold reflectivity. A laser having at least a first mirror and an MRBR as the second mirror has a laser cavity, at least a portion of which is defined by the first mirror and the MRBR. An active region located within the laser cavity contains a material that is capable of stimulated emission at one or more wavelengths in the first and second wavelength bands. The gain spectrum of the laser is adjusted to select one of the first and second wavelength bands, thereby providing for lasing at a wavelength within the selected wavelength band. The laser may be, e.g., a monolithic VCSEL or a one-section or two-section external-cavity VECSEL having the MRBR as one of its cavity mirrors.
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Citations
20 Claims
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1. A multiple reflectivity band reflector, comprising a plurality of layers of material arranged in parallel such that the reflector has:
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a first wavelength band with reflectivity above a threshold reflectivity, wherein the threshold reflectivity is at least 99%;
a second wavelength band with reflectivity above the threshold reflectivity; and
a third wavelength band including wavelengths between the first and second wavelength bands having reflectivity below the threshold reflectivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A multiple reflectivity band reflector comprising:
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means for reflecting light in a first wavelength band at a reflectivity above a threshold reflectivity, wherein the threshold reflectivity is at least 99%;
means for reflecting light ma second wavelength band at a reflectivity above the threshold reflectivity; and
means for reflecting light in a third wavelength band including wavelengths between the first and second wavelength bands at a reflectivity below the threshold reflectivity. - View Dependent Claims (17, 18, 19, 20)
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Specification