January 2020: Raytum Photonics was awarded two SBIR programs in the start of new decade


(Phase I, DOE) Ultra-bright Quantum Light Source Using Entangled Two-Mode State

Quantum light source is the key component for developing transparent optical quantum communication networks to support distributed quantum information science. This program is to build an innovative, bright, multi-channel quantum light source for developing quantum networks. 


(Phase I, DOD NavyAnti-reflective Surface for Infrared Optical Fiber Endfaces

May 2019: Raytum Photonics kicks-off three DOE SBIR programs


​(Phase I) High-Accuracy Angle Generator for Angular Calibration


In this SBIR program we are going to develop a device that is capable of providing high accuracy angular information that can meet the accuracy of less than 50 nrad over a range of about 20 mrad . The innovation of the proposal is based on the principle that the angular information is not presented in the position space as normally done by a conventional angular measurement process, but it is presented in the frequency space using a laser wavelength, which inherently possesses high accuracy by the nature of the laser wavelength. 


​(Phase II)  High Power Fiber Laser System for Polarization of Helium-3 Gas


The goal of this program is to design and develop the prototype of next generation pumping laser at 770nm through frequency doubling the high power 1540nm fiber laser. Compared with traditional fiber coupled diode laser used in Helium-3 polarization, the prototype we develop has unique features that have never been accomplished before: the lasing linewidth is tunable from extremely narrow of sub-GHz to 10s GHz, direct linear or circular polarization output with polarization maintaining fiber delivery, and exceptional diffraction-limited output beam quality. The whole laser system not only can provide the scalable output power but also has the ability to tune and lock the center wavelength to match the exact position of absorption line.


(Phase II)   Precise and ultra-stable laser polarization control for polarized electron beam generation


Parity-violating scattering of polarized electron beam has been demonstrated to be a key factor in the success of many high-energy and nuclear physics programs in DOE national labs. The next generation parity-violating experiment, such as MOLLER, requires extremely precision. This SBIR proposal is to build a precise and ultra-stable circular laser polarization flipping system for helicity-flipping polarized electron beam generation to meet the precision requirements.


APRIL 2018:

Raytum Photonics is proud to announce the award of two 2018 DOE Phase I SBIR and one 2018 DOE Phase II SBIR Proposals.   The following Proposals were awarded:

(DOE Phase I SBIR):    High Power Fiber Laser System for Polarization of Helium-3 gas
Highly polarized Helium-3 gas is an extremely important neutron target for many nuclear physics programs conducted in DOE national labs. Raytum Photonics will develop state of art fiber master-oscillator power-amplifier (MOPA) combined with the frequency doubling module to provide the best and turn-key solution for the polarization of Helium-3 gas. This system will not only increase the pumping speed of polarizing Helium-3 , but also provide the solution for direct circular polarization output and thus save the setup cost and lab space.

​(DOE Phase I SBIR):    Precise and ultra-stable laser polarization control for polarized electron beam generation
Polarized Electron Beam is generated by circularly polarized laser light from a GaAsP photocathode with its polarization state determined by the laser light’s polarization.   Raytum Photonics propose a highly-accurate and ultra-stable circular laser beam polarization flipping system which is consisted of an Electro-optic modulator based on a transversely modulated and birefringence compensated potassium di-deuterium phosphate (DKDP) crystal, driven by an innovative high voltage switching driver.  Our approaches are aimed to realize faster helicity flipping and minimize helicity-correlated change. 

(DOE Phase II SBIR):    High Power Extremely Narrow Linewidth Diode Laser for Polarizing Helium-3 Target
Raytum Photonics will deliver a fiber coupled diode laser system with output power of more than 200W, linewidth less than 0.1 nm and the lasing wavelength automatically locked to the Rb absorption line. We are also going to engineer a prototype high power laser module to evaluate the concept of kW fiber coupled system for the polarization of Helium-3. The high power fiber coupled diode laser has also been widely used in the material process industry.















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