Optical Bench Layout for Vapor Cell Spectroscopy and Laser Locking
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Solution Overview
Problem
The complexity and cost of optical setups for optical spectroscopy using vapor cells are barriers to the widespread deployment of optical frequency standards due to the need for numerous custom and expensive optics, polarizers, and photodiodes, with beam misalignment impacting accuracy.
Innovation Solution
A spectroscopy system utilizing a vapor cell with overlapping optical paths for probe and pump signals, employing two photodiodes and a control system for amplitude correction, power adjustment, and laser locking, reducing the need for complex optical arrangements and photodiodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical setups with multiple custom optics, polarizers, and photodiodes are used for vapor cell spectroscopy, then measurement precision and reliability are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple optical functions into a single integrated optical component that serves as both a beam splitter and a polarizer. This merging of functions reduces the number of separate optical elements needed in the system, thereby simplifying the optical setup while maintaining the precision required for accurate spectroscopy measurements of the vapor cell
Solution Approach 2:
The patent employs a universal optical component that performs multiple functions simultaneously: beam splitting, polarization control, and signal routing. This multi-functional component replaces what would traditionally require several separate custom optics, reducing system complexity without compromising measurement precision
2Measurement precision
If traditional optical setups with multiple photodiodes are used for detecting pump and probe signals, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the detection functions of multiple photodiodes into a single photodiode by using an integrated optical component that directs both the pump and probe signals to the same detector. This eliminates the need for multiple separate photodiodes and their associated readout circuits, reducing device complexity while maintaining signal detection accuracy through proper optical path management
3Manufacturing precision
If multiple custom optics and polarizers are used for beam routing in vapor cell spectroscopy, then laser locking and power adjustment precision are improved, but ease of operation deteriorates due to alignment sensitivity
Solution Approach 1:
The patent combines beam routing and polarization control functions into a single integrated optical component, which reduces the number of alignment-critical interfaces in the optical path. This merging reduces sensitivity to misalignment while maintaining the precision needed for laser locking and power adjustment operations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves accurate spectroscopy with simplified optical components, enabling efficient power and modulation component measurement, and laser frequency stabilization, thus addressing the complexity and cost issues of traditional setups.
Implementation Method 1
a first photodiode configured to receive a portion of the pump optical signal before passing through the vapor cell
Implementation Method 2
a second photodiode configured to at least one of (i) receive a portion of the probe optical signal after passing through the vapor cell or (ii) detect a fluorescence of the vapor cell
Implementation Method 3
a vapor cell configured to receive a probe optical signal and a pump optical signal
Implementation Method 4
detect a fluorescence of the vapor cell
Data Source
AI summary
Embodiments herein describe various arrangements of an optical bench used to perform spectroscopy. For example, a spectroscopy system may include a pump optical signal and a probe optical signal that are transmitted through a vapor cell on the optical bench. The optical bench can further include one or more optical components (e.g., beam splitter and a thin film polarizer) for redirecting a portion of the probe and pump optical signals to photodiodes. In one embodiment, the measurements obtained from the photodiodes can be used to perform multiple tasks. For example, the measurements can be used to adjust the power of the optical signals in the optical bench (e.g., make DC power adjustments), perform amplitude modulation correction, and lock a laser frequency to a peak of an absorption spectrum of the vapor in the vapor cell.