[10p-A11-1~12] 4.3 Laser sources and Laser applications

4:15 PM - 4:45 PM JST(7:15 AM - 7:45 AM UTC)English Presentation

[10p-A11-7] [JSAP-Optica Joint Symposia Invited Talk] High-Repetition-Rate Fundamentally Mode-Locked Figure-9 Fiber Laser and Its Application to Highly Sensitive Spectroscopy

〇Shotaro Kitajima¹, Norihiko Nishizawa¹ (1.Nagoya Univ.)

Keywords:

fiber laser,mode-locked laser,optical frequency comb

Figure-9 fiber lasers provide an ideal platform for optical frequency combs, combining an all-polarization-maintaining configuration with a broad spectral bandwidth and low-noise characteristics. However, the difficulty in shortening their physical cavity length has limited their fundamental repetition rates to approximately 250 MHz. This restriction has posed a challenge for highly sensitive precision spectroscopy, which requires high repetition frequencies. In this study, we addressed this issue by miniaturizing the intracavity components and applying a precise cavity design, successfully achieving a high repetition rate of up to 404 MHz. Furthermore, by integrating this high-repetition-rate laser with a high-resolution comb-mode filtering technique, we obtained multi-milliwatt-level optical power per single comb mode. Finally, we demonstrated the direct application of this system to highly sensitive spectroscopy.