Dual-comb picosecond ultrasonic thickness gauge

~2 nm measurement resolution

Uses dual-comb asynchronous optical sampling to obtain a 4 ns time delay without a mechanical delay line, enabling high-precision rapid thickness measurement of metal films.

Yuanhao, Zhu · Yan, Dongyu · Jinyang, Zou · Wu, Ziling · Pang, Dongqing · Liu, Bowen · Hu, Chunguang · Song, Youjian · Hu, Minglie

Laser and Optoelectronics Progress 2025

Specifications

等效

{'zh': '0.6', 'en': ''} m

Measurement resolution

{'zh': '~2', 'en': '~2'} nm

Au film thickness

{'zh': '-165.33', 'en': '-165.33'} nm