Terahertz Wave Generation Using Delayed Pump Beam Segmentation
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Solution Overview
Problem
The driving frequency of Q switch YAG lasers in terahertz wave generating devices is limited to approximately 100 Hz, restricting the performance and detection velocity of terahertz wave generating devices used in spectroscopic applications.
Innovation Solution
A terahertz wave generating device configuration that includes a fixed-wavelength pump optical laser, a variable-wavelength laser, a delay element, and non-linear crystals to generate terahertz waves without changing the driving frequency of the pump optical laser, by overlapping delayed and undelayed pump beams to increase the frequency of terahertz wave generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving frequency of the Q switch YAG laser is increased to improve terahertz wave generation efficiency, then the spectroscopic detection velocity improves, but the laser lifespan and reliability deteriorate due to exceeding the maximum driving frequency limit of approximately 100 Hz
Solution Approach 1:
The pump beam is divided into multiple pulses by introducing a delay line that creates temporal separation between pump pulses. This segmentation allows the system to achieve higher effective repetition rates without overloading the laser's maximum driving frequency capability, thus improving detection velocity while maintaining laser reliability
Solution Approach 2:
The delay line introduces periodic delays to create a sequence of pump pulses with controlled intervals. This periodic action enables the system to operate at effective frequencies higher than the laser's base driving frequency by utilizing multiple pulses within each laser cycle, thereby improving spectroscopic detection velocity without compromising laser lifespan
2Productivity
If the driving frequency of the pump optical laser is increased to improve terahertz wave generation efficiency, then the generation efficiency of terahertz waves improves, but the device complexity increases due to the need for delay elements and beam combination mechanisms
Solution Approach 1:
The pump beam is segmented into multiple temporal pulses using a delay line, which is a relatively simple optical component. This segmentation approach achieves higher effective repetition rates without requiring complex laser modulation systems, thus improving terahertz wave generation efficiency while adding minimal device complexity
Solution Approach 2:
A delay line is introduced as an intermediary element to manipulate the temporal structure of the pump beam. This simple optical component enables complex temporal shaping and beam combination functions without requiring sophisticated control systems or multiple active elements, thereby improving generation efficiency with minimal increase in device complexity
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
This configuration improves the generation efficiency of terahertz waves, allowing for higher frequency operation without altering the pump optical laser's driving frequency, thereby enhancing the velocity and efficiency of spectroscopic measurements.
Implementation Method 1
a first non-linear crystal that generates terahertz waves by receiving the seed beam, a first pump beam that is not delayed by the delay element, and a second pump beam that is delayed by the delay element
Implementation Method 2
a delay element that delays pulses of the pump beam
Data Source
AI summary
A terahertz wave generating device according to the present invention comprises a fixed-wavelength pump optical laser that generates a single wavelength pump beam, a variable-wavelength laser that emits a seed beam and is capable of making the wavelength of the seed beam variable, a delay element that delays pulses of the pump beam and a first non-linear crystal that generates terahertz waves by receiving the seed beam, a first pump beam that is not delayed by the delay element and a second pump beam that is delayed by the delay element.