共振腔結構對體積全像光柵外腔雷射穩定度之探討

Stability Analysis of Resonant Cavity Structure to VHG external cavity laser

張倉睿(Cang-Rui Zhang)

指導教授 ： 莊賀喬

國立臺北科技大學/機電學院/機電整合研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00418

摘要

本研究利用體積全像光柵(Volume Holographic Grating, VHG)並搭配矽彈簧晶片為其夾治具，自製兩台不同結構的外腔雷射。第一台容易校正、控制，並且有著較佳的機械穩定性。由於其較短的腔長(15 mm)，使掃頻範圍可輕易達到9.6 GHz。若加上電流的前饋(feed-forward)裝置，則其掃頻的範圍可達16 GHz以上。此雷射可被穩頻在銣原子D2吸收頻率，並依此測量出雷射線寬為885 KHz。另一台雷射則具有較小的體積(25×25×46.5 mm3)，較長的腔長(29.5 mm)。我們同時設計密閉之雷射外殼，使得我們可以將其抽真空至300 mtorr，以研究外界空氣擾動及室溫變化對雷射的影響。最後我們可將此雷射穩頻1小時以上。

關鍵字

外腔雷射 ； 雷射冷卻 ； 體積全像光柵

並列摘要

This thesis presents two external cavity diode laser (ECDL) systems, each utilizing a volume holographic grating (VHG) and a micro-fabricated silicon flexure as the VHG holder. One laser is aimed for easy assembly, controllability, and better stability of the laser cavity. It has a cavity length of 15 mm, and its mode-hop-free tuning range is 16 GHz (9.6 GHz) with (without) feed-forward on the diode injection current. The laser frequency was stabilized to a D2 transition of rubidium at 780.247 nm, and its linewidth was measured as 850 kHz in 500s. The other laser has a longer cavity length (29.5 mm) and a smaller overall size (25×25×46.5 mm3). This laser is hosted in a hermitically sealed box which is under vacuum (300 mtorr), in order to isolate the laser from ambient perturbations. Finally, this laser is also locked on rubidium D2-line more than one hour.

並列關鍵字

External Cavity Diode Laser ； Laser cooling ； Volume Holographic Grating

參考文獻

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