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Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: HQ0147-09-C-7104
Agency Tracking Number: B083-002-0483
Amount: $100,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2009
Solitcitation Year: 2008
Solitcitation Topic Code: MDA08-002
Solitcitation Number: 2008.3
Small Business Information
Voxtel Inc.
12725 SW Millikan Way, Suite 230, Beaverton, OR, 97005
Duns: 124348652
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Andrew Huntington
 Senior APD Engineer
 (971) 223-5646
 andrew@voxtel-inc.com
Business Contact
 George Williams
Title: President
Phone: (971) 223-5646
Email: georgew@voxtel-inc.com
Research Institution
N/A
Abstract
A radiation-hard, 1064-nm sensitive, single-photon-sensitive avalanche photodiode (APD) detector with photon detection efficiency (PDE) and dark count rate (DCR) superior to state-of-the-art Geiger-mode APDs, and with two orders of magnitude faster maximum count rate (MCR) will be developed. Geiger APDs are constrained by a fundamental tradeoff between DCR and MCR: if the APD is cooled to reduce DCR, then its dead time must increase to avoid afterpulsing, thereby reducing MCR. Linear APDs are not subject to this constraint, and so can be operated with dead times on the order of 250 ps. This improvement in MCR translates into a proportional improvement in single photon bit rate. Voxtel has previously demonstrated a multi-stage InGaAs APD design with high gain and low avalanche noise. In this effort, the dark count rate of the multi-stage APD will be improved by using InGaAsP gain stages to replace the existing oxygen-scavenging InAlAs materials. The improved multi-stage APDs will be demonstrated to have high gain (>1,000), low jitter (<20 ps), high saturation (>108 photon), and with low DCR (< 10 kHz) at temperatures >220 K, so that in Phase II, fully functional 32 × 32 LADAR arrays can fabricated and demonstrated.

* information listed above is at the time of submission.

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