A kind of external cavity tuned laser

A laser and cavity tuning technology, which is applied in the field of cost-effective external cavity tuning lasers, can solve the problems of being unable to adapt to the application of lidar point cloud data, low overall system speed, and slow frame switching speed, etc., achieving cost advantages, low production costs, The effect of improving tuning accuracy and resolution

Active Publication Date: 2018-01-23
SHENZHEN LITRA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the MEMS micromirror array, in addition to the high cost, the frame switching speed is slow, resulting in a low overall system speed, which cannot adapt to applications such as lidar that require fast scanning to obtain point cloud data.

Method used

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  • A kind of external cavity tuned laser
  • A kind of external cavity tuned laser
  • A kind of external cavity tuned laser

Examples

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Embodiment example 1

[0027] This embodiment provides an external cavity tuned laser. Through the pattern design of the metal-plated thin line area pattern on the mirror, a linear frequency sweep output can be obtained. This embodiment is suitable for an optical frequency modulated continuous wave lidar as a frequency sweep laser light source.

[0028] This example figure 1 As shown, the laser gain chip 1 has a central wavelength of the gain region at 810 nm, and the adjustable wavelength range of its gain is 780 nm to 840 nm. The laser gain chip 1 can be formed by a semiconductor Fabry Perot laser. The back end of the laser gain chip 1 has a high reflection HR coating 11 for the 800nm ​​infrared band, and the front end has an anti-reflection AR coating 12, so that as much laser as possible can be emitted from the front end of the laser gain chip 1 and enter the collimating lens 2, where the laser output power used is 5mW. After the laser passes through the laser gain chip 1, it is collimated by the c...

Embodiment example 2

[0031] This embodiment provides a dual-wavelength external cavity tuning laser. Dual-wavelength lasers are often used in the fields of continuous wave difference frequency generation of terahertz waves, non-contact optical sensing, etc. There are many methods for manufacturing dual-wavelength lasers. In this embodiment, the reflective mirror 5 is mainly used to plate the metal-plated fine line area pattern. Achieve, such as Figure 4 As shown, the metal-plated thin line area pattern set on the reflector is a pattern formed by two parallel gold-plated curves, including a metal-plated thin line area pattern composed of a metal-plated curve 401 and a metal-plated curve 402. This embodiment The optical setting of the case is the same as that of case 1, and the laser gain chip adopts the same product. The pattern of the mirror 5 is as Figure 4 As shown, the two parallel curves represent the two selected wavelengths, and the wavelength spacing remains unchanged during the frequency ...

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Abstract

The invention discloses an external cavity tuned laser, comprising a laser gain chip for wavelength gain of laser light, a collimator lens for collimating laser beams, and generating first-order diffracted light and zero-order A grating for diffracted light, a focusing lens for concentrating and transmitting the first-order diffracted light, a reflector for selectively reflecting the first-order diffracted light after concentrating and transmitting, and a motor for driving the reflector to rotate; , the reflective mirror is also provided with a metal-plated fine line area pattern. In the present invention, the metal-plated thin line area pattern is made by micromachining technology including photolithography and thin film deposition. Different pattern designs can realize different wavelength adjustment functions, such as single-wavelength linear tuning, dual-wavelength tuning lasers, and multi-wavelength tuning lasers. And so on, so as to meet the application requirements of tuned lasers in different occasions.

Description

Technical field [0001] The invention relates to the field of external cavity tuning lasers, in particular to a high cost performance external cavity tuning laser that can be used in a lidar system. Background technique [0002] External cavity tuning lasers are key devices in the fields of optical communications, spectroscopy, lidar, and optical coherence tomography. The external cavity tuned laser based on semiconductor gain chip has been widely studied and applied due to its relatively high integration and relatively simple optical system design. Its traditional structure mainly includes Littman and Littrow designs. The Littrow design achieves wavelength selective feedback back to the laser gain chip by adjusting the angle between the grating and the incident laser. The disadvantage of this design is that the direction of the emitted light is not fixed, which causes great inconvenience to the subsequent optical path construction. The Littman structure adjusts the relative incl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/14H01S5/06
Inventor 张忠祥
Owner SHENZHEN LITRA TECH
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