Claims
- 1. An improved semiconductor laser having improved transmission characteristics when transmitting in a liquid or a transparent solid medium having an index of refraction n.sub.m comprising:
- a first dielectric coating disposed on an end-facet of the semiconductor laser having an index of refraction n.sub.1 ; and
- a second dielectric coating disposed on the first dielectric coating having an index of refraction n.sub.2, the materials of the dielectric coatings are selected such that n.sub.1 /n.sub.2 =n.sub.m.
- 2. An apparatus according to claim 1 in which the material of the first dielectric coating is magnesium fluoride and the material of the second dielectric coating is aluminum oxide.
- 3. An apparatus according to claim 2 in which the first dielectric coating and the second dielectric coating are applied to a thickness of one-quarter wavelength.
- 4. A method of improving the transmission characteristics of a semiconductor laser in a liquid or transparent solid medium having a refractive index of n.sub.m comprising:
- disposing a first dielectric coating on an end-facet of the semiconductor laser having an index of refraction n.sub.1 ; and
- disposing a second dielectric coating on the first dielectric coating having an index of refraction n.sub.2, the materials of the dielectric coatings are selected such that n.sub.1 /n.sub.2 =.sqroot.n.sub.m.
STATEMENT OF GOVERNMENT INTEREST
The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
US Referenced Citations (4)
Non-Patent Literature Citations (1)
Entry |
Ettenberg, "A New Dielectric Facet Reflector for Semiconductor Lasers", A. Phys. Lett. 32(11), Jun. 1, 1978, p. 724. |